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Патент USA US3075068

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JanQZZ, 1963
3,075,058
E. T. PLATZ ETAL
PUSH-PUSH CIRCUIT BREAKER
Filed Dec. 17, 1959
5 Sheets-Sheet 1
15.5 a
INVENTORS
ELM/000 f PLJTZ
BY
5'
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Jan. 22, 1963
E. T. PLATZ ETAL
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3,075,058
PUSH-PUSH CIRCUIT BREAKER
Filed Dec. 17, 1959
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PUSH-PUSH CIRCUIT BREAKER
Filed Dec. 17, 1959
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INVENTORS
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Jan, 222, 1963
E. 'r. PLATZ ETAL
3,075,058
PUSH-PUSH CIRCUIT BREAKER .
Filed Dec. 17, 1959
5 Sheets-Sheet 5
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INVENTORS
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United States Patent 0 M1C6
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3,®‘i5,tl5§
PUSH-PUEH Qilt?llill‘ BREAKER
Elwood ll‘. Flats and Victor Mitehnick, Detroit, Mich, as
siguors to li~T~E Eircuit Breaker Company, Philadelphia,
Pa, a corporation or Pennsylvania
Filed Dec. 17, 195?, her. No. 860,273
25 Qiairns. (tll. ass-es)
FIGURE 1 is a pers ective view 01‘ a circuit breaker,
with the back cover removed, constructed in accordance
with the instant invention. The case is constructed to
house two individual pole units. However, only a single
pole unit is illustrated.
FIGURE 1:; is a plan view of the circuit breaker oi‘
FIGURE 1.
FIGURE 1b is a back view of the circuit breaker case
The instant invention relates to circuit breakers of the
illustrated in FIGUQE l with the mechanism removed so
type utilized for the protection of branch circuits in the 10 that internal details of the case are visible.
home and for light industrial applications. More particu~
FIGURE 2 is a cross-section taken through line 2-2
larly, the instant invention relates to a circuit breaker, of
of FIGURE 2a looking in the direction of the arrows. In
the type previously noted, which is manually operated be
FIGURE 2 the mechanism is in the circuit closed position.
tween its On and Off positions by successive operations of
FIGURE 2a is a rear elevation of the circuit breaker,
15 with the cover removed, looking in the direction of arrows
a slidable handle in the same direction.
in US. Patent 2,385,727 there is illustrated a single
2a—2a of FIGURE 2.
pole circuit breaker of the so called push-push type. In
FIGURE 3 is a view similar to FIGURE 2 with the
order to conserve panel board space the instant invention
mechanism in the circuit open position.
provides a construction which is so compact that two
FIGURE 4 is a side elevation of the electrical sub
single pole units now occupy the space formally occupied 20 assembly.
by the single pole unit of the aforesaid Patent 2,385,727.
FEGURES 4a and 4b are cross-sections taken through
The compact construction is achieved without sacri?cing
lines 4a—4zz. and ‘lb-41’), respectively, of FEGURE 4
any of the features found in large size breakers of this
looking in the directions of the respective arrows.
FIGURE 5 illustrates a modi?ed mounting for the bi
That is, the breaker of the instant invention achieves 25 metal time relay tripping means which incorporates
a slow make through the long stroke of the manual operat
features for ambient compensation.
ing handle in moving to the On position. Quick break is
FIGURE 6 is a side elevation of the handle sub-assem
achieved by tripping a latch through a short stroke of the
bly.
operating handle to the (3ft position. Automatic resetting
FIGURE 6.4 is an end view of the handle sub-assembly
is achieved during the long stroke of the handle to the On
looking in the direction of arrows 6a~6a of FZGURE 6.
type.
position. The mechanism is trip free and there is a mag
netic coil for instantaneous tripping at predetermined low
values of overload current as well as under short circuit
conditions. There is a dual On~0it indication achieved
by having the manual operating handle occupy diiierent
positions for the On and Off conditions of the breaker
and also having a visible member which carries On-Oilc in
dicia thereon.
The above noted features are achieved with a construc
tion utilizing tWo sub-assemblies which are readily insert
able into a molded plastic case. This construction facili
tates assembly, renders the mechanism immune to expan
sion contraction or deterioration of the plastic case, and
permits electrical calibration of the trip means outside of
the case before ?nal assembly.
HGURE 7 is a cross-section taken through lines 7-7
of FIGURE '70: looking in the direction of the arrows and
illustrates a modified circuit breaker construction.
FIGURE 7a is a back view of the circuit breaker of
FEGURE 7 with the cover removed to reveal details of
the operating mechanism.
Now referring to the figures and more particularly to
FIGURES 1-641, each pole of duplex circuit interrupter
40 res comprises a case Iii-ll, molded of insulating material,
wherein electrical sub-assembly iii’). (EEGURES 4—4b)
are disposed in operating relationship. Since the operat
ing mechanisms for both poles of duplex circuit inter
rupter see are identical, only one pole unit shall be
described in detail.
The current path through each pole of the interrupter
One sub-assembly comprises the manuual operating
is from line terminal ii, its stationary contacts lb, movable
handle and a tripping pawl while the other sub-assembly
contact 252, contactor arm 2, pigtail 3, bimetal support
comprises all of the moving parts of the circuit breaker not
It, bimetal 5, pigtail 6, coil 7, load terminal tang S, and
carried by the handle such as the movable contact arm, 50 load terminal collar 9. The case lot is provided with
three slots Ittla for receiving rivets it} which secure cover
the time delay tripping means and the instantaneous trip
ping means.
it and cover liner 5.2 t
case till. Duplex breaker ltitl
Accordingly, a primary object of the instant invention is
is attached to the mounting plate of the ultimate enclosure
to provide a novel construction for a circuit breaker of the
by means of the lugs 111a formed from the cover it.
A case aperture ltlb is provided through which the re
duced portion to of line terminal 1 extends to the outside
of the case hill where line terminal screw 13 is positioned
by screw retainer 14. Case Elli. includes hole the through
which coir end "in extend at the point where it is attached
69 to the tang 8.
The upper part of the case its has two substantially
push-push type.
Another object is to provide a novel circuit breaker of
especially compact and inexpensive construction.
Still another object is to provide a circuit breaker con
truction whereby two single pole units occupy the same
space in a panelboard occupied by a single pole unit of the
prior art.
identical cavities lilld and lite de?ned by the outside walls
1th‘ and Mg and a centrally located wall iii/‘z the ends
of which provide walls llli which form openings or guides
into a molded plastic case.
A still further object is to provide a novel circuit 65 for the upper portion of handle l5. Post iii/c with its
circular projection Iiils comprise means for positioning
breaker sub-assembly which includes a movable contact, a
frame id in case till. Curved grooves than comprise
bimetallic trip means and a coil for instantaneous tripping
A further object is to provide a novel circuit breaker
construction comprised of two sub-assemblies insertable
at predetermined low values of overload current as well
as under short circuit conditions.
These as well as other objects of the instant invention
shall become readily apparent after reading the following
description of the accompanying drawings in which:
means for operating the On and Off indicator as will be
hereinafter explained. A contact chamber ltin in the
lower part of case 101 receives line terminal 1 with its
two contacts lb. The grooved opening tilt receives vent
screen Hi5.
3,075,058
S
‘Tang 8 has a circular embossment 8a which acts as a
supplementary holding means for the load terminal con
ductor (not shown) and which cooperates with the spheri
cal end 16a of load terminal screw 16 to draw tang 8
out of ease Th1 and the collar inward. .End 8b of tang 8
is bent down to hold the collar 9 in place.
Handle sub-assembly 1% comprises pawl device 17
pivotally mounted to handle 15 by shoulder rivet 18.
The combination compression and torque spring 19 holds
the pawl 17 against the handle surface llSaand at the
4
hook 24a Thermally, the top of bimetal 5 warps-to the
left with respect to FIGURE 2 under moderate condi~
tions of overload to engage the insulating rivet 26. When
the current reaches a high value of overload, the mag
netic ilux generated by coil '7 draws the top of the arms
ture 24 instantly to the left, likewise to cause unlatching.
For the mode of operation, reference is ?rst made to
the Off position of FIGURE 3 where pawl 1'7 'is shown
held in its extreme counterclockwise position by the
10 latch surface 2.]: on the bent end 2g of arm 2 bearing
same time biases pawl 17 in a clockwise direction for a
against ?ange 17a of pawl 17. When handle 15 is de~
purpose to be explained later. The pawl 1'7 includes a
notch 1%, a flange 17a, a hook 170, ‘and an armature
pressed, its cam surface 15)‘ engages the cam surface 2]‘
of arm 2 causing latch surface 2;; to rise and ultimately
engaging lug 1741, for purposes to be explained later.
to latch or to rest on the latch surface 24d of armature
The groove 15b slidably receives the On-Otf indicator 15 24. The relation between the cam surfaces 151“ and 2]‘
plate lltl'7 which is visible through an opening in the
is such that arm 2 does not rise until the armature en~
projection £50 on handle 15 and which is moved into
gaging lug 17d of pawl 1'7 is under the hook 24a of
its On and Off positions by its lug 1% which rides in
armatureza so that handle 15 is not stopped in an in
groove lltlm of case 101.
termediate position by the engagement of these elements.
Pocket 15a’ is a recess for the handle return spring 26. 20
During the later portion of the inward travel of the
This spring also extends partly into a similar pocket lllp
handle 15, the bent end 2g of arm 2 has moved away
in case ltl'll. One end of handle return spring 26 rests
from flange 17a which now rides along the under side of
against the lug lttq in the case 161 while the other end
hook 2% under the clockwise influence of spring 19.
of spring 2% bears against surface 156 of handle 15 so
When handle 15 is released from the full inward position
that the handle 15 is always biased outwardly, for a
of its On stroke, it is biased to the right by handle return
reason to be explained later. The sloped surface 15]‘
spring 20‘ and latch edge 211 of arm 2 pivots on latch
of handle 15 is the resetting surface for contactor arm 2.
edge 24d of the armature 24. The arm 2 under the in
Frame 16 includes ?ange ltia with a hole 16b which
fluence of mainspring 21 is biased in a counterclockwise
locates the shoulder guide rivet 29 which in turn is the
direction causing ?rm engagement between contacts 2b
pivot point for the arm 2. The embossment 16c locates 30 and 1b. Also during this outward movement of handle
the upper end of the main spring 21. Flange 16d has a
15, armature engaging lug 17d disengages from arma
hole at Me for receiving shoulder rivet 22. The ?ange
16 has 2 rivet holes for the attachment thereto of the
bimetal support 4. The upwardly bent ?ange 16g has
ture hook 24c permitting pawl 17 under the influence of
spring 19 to rotate clockwise causing hook, 17c to engage
lug 16m ‘thereby limiting the outward travel ‘of handle 15
notches 1611 on both sides to receive the lugs 24a on 35 to its On position as shown in FIGURE 2.
the end of the bent portion 24b of armature 24- to form
a tongue and groove connection between these members.
Means to provide two positions of a handle correspond
ing to the On and'O? conditions of the breaker through
the cooperation of pawl tip 17c and frame lug 16m has
been described. An additional means of ‘On and Off
The embossment 161 located between the notches 16h
is for the purpose of providing a frictionless bearing for
the lower end of armature 24. End 16g is bent upward 40 indication is ‘given by indicia carrying plate 1% sliding
45° so that armature 24 will always be biased down
in the groove 15b of the handle guided by case groove
wardly to a uniform and consistent position. The lower
10m. To turn the breaker Off, handle 15 is depressed
end of bimetal 5 is attached to the lower end of bimetal
from the On position of FIGURE 2 so that armature en
support 4 while the upper end of bimetal 5 de?ects to
gagement lug 17d of pawl 17 engages- ‘the bight in the
the left to engage the insulated rivet 2d of armature 24
armature hook 242 and rotates armature 24 in a counter
to trip the breaker thermally, by means to be described
clockwise direction about its lower end causing the upper
later.
end to move to the left against the bias of the conical
armature return spring 27. This causes latch 24a‘ of
Contactor arm 2 is provided with movable contact 2b
armature 24 to unlatch from latch edge 2h of contactor
at the left end and an elongated slot 20 having clear
ance at 2d to provide clearance for contact wear and 50 2 and permits contactor 2 under the‘influence of main;
clearance at 22 so that the arm 2 can be raised when
spring 21 to pivot about the shoulder guide rivet 29 and
reset.‘ The surface 2]‘ of arm 2 is for resetting while
the bent end 2g is for engagement with the latch
edge 24d of armature 24. Arm lug Zj receives the lower
end of the mainspring 21. Offset 2k clears the edge 16s
on the frame 16 during the normal operation of arm
2 but during pre-assembly or calibration, it limits the
to rotate clockwise into the Off position of FIGURE 3.
This sequence of movement also causes the bent end 2g
of arm 2 to strike and depress the flange 17a of the
movement of arm 2 so that spring 21 will not fly off.
pawl 17 causing the hook 17c to disengage from the lug
16m, whereupon handle 15 under the in?uence of handle
return spring 2%), will move to the right into the Off
position.
.
The purpose of the bight in the hook 24c is to obtain
Armature 24 includes a clearance slot 241) to receive 60 a positive stop for lug 17d and likewise for handle 15
so that, if handle 15 is depressed excessively, lug 17:!
the shoulder portion 22a of shoulder rivet 22, a hole
will not slip off hook 24c. 'If the lug could slip off
240 for the insulating rivet 26, and a latch surface 244
hook 242, the operator could inadvertently turn the
for engaging the latch 2g of arm 2 as previously men
breaker Off and immediately turn. it On again'during
tioned. The hook 24s is the manual off lug which en
gages pawl surface l’Z/b, to be explained later. Head 65 the supposedly O?-On stroke of handle 15. The bight
in hook 242 will force the operator to at leastslightly
2217 of rivet 22 acts as a stop for the armature 24 against
release the handlein turning O? before he can push
the reaction of conical spring 27. Shoulder 22a retains
magnetic core 2% in the position shown with coil 7 of
handle 15 all the way in to turn the breaker On. It
several turns positioned around magnetic core 28.
should be noted here that considerably more inward
From the preceding description of the mechanism, it 70 movement of handle 15, is required to turn the breaker On
should be apparent that contactor 2, under the in?uence
than is required to turn the breaker Off.
of spring 21, can be unlatched from armature 2a to
The O? position of FIGURE 3 showsno interference
assume the O? position of FIGURE 3 by three methods
between offset 21k in arm 2 and the edge 16s of frame
This feature will be explained more completely later.
as follows.
Manually, by means to be explained more
16. It is apparent, that during preassembly with pawl
fully later, the surface 17d of pawl device 1'7 engages 75 37 and handle 15 not in place, the space relation be‘
3,075,058
6
5
tween offset 2!: and edge 16s will limit excessive clock
wise movement of arm 2 and consequently prevent the
we ‘therefore prefer to be limited, not by the speci?c dis
closure herein, but only by the appending claims.
mainspring 21 from ?ying into space.
‘We claim:
1. A circuit interrupter comprising a handle arranged
to be advanced manually and returned automatically,
means for automatically returning the handle, a stop for
limiting return movement of and de?ning an extreme
position of the handle; a contractor carrying a movable
to unlatch ‘the latch surface 2g of arm 2 from latch sur
contact movable through manual advance of said handle,
face 24%;! of the armature 24. It is obvious that this
action is an aid rather than a deterrent to the movement 10 a pawl device movably mounted to‘ said handle for limit
ing return movement of the handle to an intermediate
of ‘armature 2d when the upper end of bimctal 5 de?ects
position, the pawl device movable into and out of han
to the left under conditions of moderate overload or when
dle stopping position, means biasing said pawl device into
the armature 24 is magnetically drawn to the left under
handle stopping position, said contactor in moving to cir
conditions of high values of overload. It is also obvious
The trip free feature is accomplished as follows: With
reference to the On position of FIGURE 2, it has been
explained that when handle 15 is depressed, armature en
gagement lug l‘ld of pawl 17 engages armature hook 24a
that cam surface 2f of arm 2, moves away from cam sur
cuit open position operating said pawl device against its
face 15]‘ of handle is when the breaker is unlatched
bias out of handle stopping position and permitting move
either manually, thermally by the bimetal, or magnetically
ment of tr e handle to the extreme position.
2. A circuit interrupter comprising a handle arranged
to be advanced manually and returned automatically,
ambient compensation. Here the bimetal support do for 20 means for automatically returning the handle, a stop for
limiting return movement of and de?ning
extreme
the main bimetal 5 is also comprised of bimetal having
lib as the high expansion side. The deflection of the
position of the handle; a contactor carrying a movable
top of the bimetal 5 to the left due to an increase in
contact movable through manual advance of said han
ambient temperature is compensated for by the clock
dle, a pawl device movably mounted to said handle for
wise movement of the lower end of the bimetal support
limiting return movement or" the handle to ‘an intermedi
Kira due to the same increase in ambient temperature.
ate position, the pawl device movable into and out of
FIGURE 7 shows the Sn position or" another embodi
handle stopping position, means biasing said pawl device
ment of this invention employing the same contactor arm
into handle stopping position, said con-tactor in moving
‘and very much the same handle sub-assembly but with
to circuit open position operating said pawl device
a diliercnt load terminal, bimetal mounting, armature
‘against its bias out of handle stopping position and per
and coil arrangement. in this construction, the frame 15
mitting movement of the handle to the extreme position,
as an assembly chassis is not used but generally the parts
a stationary contact engageable by said movable contact,
of the mechanism are installed individually and directly
latch means engagcable with said contactor ‘and when so
into the case. The lower end 4.0a of bimetal so is at
engaged permitting operation of said contacts into en
tached directly to load terminal 41. The lower end 42::
gagement, said latch means when disengaged from said
of ?exible metal tripper 42' is secured to the lower por
contactor preventing said contacts from remaining in and
tion of bimctal llil ‘and has a latch plate 43 of insulating
being brought into engagement, said pawl device having
material attached to its upper end. U-shaped magnetic
a portion engageable with said latch means for tripping
yoke 47' is attached to bimetal 46 at 47a and has a hole
thereof upon advancement of said handle from said in
472; for slidably receiving the right hand end 44:; of cylin 4:0 termediate position while said pawl device is in said han
by the coil.
PEGURE 5 shows an alternate embodiment providing
drical magnetic plunger 4d.
The plunger tip 48, of
non-magnetic material slidably extends through a hole
in bimetal as and engages the right hand side of latch
le stopping position.
plate 43.
3. A circuit interrupter comprising ‘a handle arranged
to be advanced manually and returned automatically,
means for automatically returning the handle, a stop for
A coil of several turns of insulated conducting wire is
mounted inside of yoke 4-7 and loosely surrounds plunger
limiting return movement of and de?ning an extreme
position of the handle; a contactor carrying a movable
4-4. This coil is not shown except that one end is attached
to the bimetal at 435a and the other end is connected to
the arm 2 at 2b by means of a pigtail as to complete the
circuit from the load terminal ?ll to the line terminal 1. 50
contact movable through manual advance of said handle,
a pawl device movably mounted to said handle for limit
In the On position shown, the latch edge 271 on the under
side of the bent end 2g of the arm 2 previously described
rests on the latch edge ilfla of the latch plate 43.
Similar in action to the embodiment, the engagement
between latch edge 2g of the arm 2 and the latch edge
63a will be unlatched when handle 15 is advanced in caus
ing return movement of the handle to an intermediate
position, the pawl device movable into and out of handle
stopping position, means biasing said pawl device into
handle stopping position, said cont-actor in moving to cir
cuit open position operating said pawl device against its
bias out of handle stopping position and permitting move
ment ‘of the handle to the extreme position, a stationary
contact engageable by said movable contact, latch means
engagea le with ‘said contactor and when so engaged per
ing the lug 17d on pawl 17 to- engage the bottom edge
lidb of latch plate
Contactor 2 will then pivot about
mitting operation of said contacts into engagement, said
the stationary pin it? and rotate in a clockwise direction
latch means when disengaged from said contactor pre
into the Oil position. This unlatching between the latch 60 venting said contacts from remaining in and being
edge 2h and the latch edge 43 will also occur when the
brought into engagement, said pawl device having a por
top bimetal dd warps to the left under conditions of light
tion engageable with said latch means for tripping there
overload or when magnetic plunger as is drawn to the
of upon advancement of said handle from said intermedi
left instantly under conditions of heavy overload. The
ate position while said pawl device is in said handle stop
turning on movement is similar to that of the embodiment
ping position, a time delay tripping means comprising a
previously described.
bimetal element engageable with said latch means for
Thus, we have provided a novel construction for a push
tripping thereof.
push type circuit breaker. The construction is especially
4. A circuit interrupter comprising a handle arranged
compact and is of a nature such that all calibration may
to be advanced manually and returned automatically,
be accomplished while the trip units are outside of the
means {or automatically returning the handle, a stop for
circuit breaker housing before ?nal assembly of the
interrupter.
Although we have here described preferred embodiment
of our novel invention, many variations and modi?cations
will now be apparent to those skilled in the ‘art, and
limiting return movement of and de?ning an extreme
position of the handle; a cont-actor carrying a movable
contact movable through manual advance of said handle,
a pawl device movably mounted to said handle for limit
ing return movement of the handle to an intermediate
sermons
position, the pawl device movable into and out of han»
dle stopping position, means biasing said pawl device into
handle stopping position, said contactorin moving to cir-~
.cuit open position operating said pawl device against its.
bias out of handle stopping position and permitting move-
position, the pawl device movable into and out ‘of handle
‘stopping position, means biasing said pawl device into
handle stopping position, said contactor in moving to cir
cuit open position operating said pawl device against its
bias out of handle stopping position and permitting
ment of the handle to the extreme position, a stationary
movement of the handle to the extreme position, a sta
tionary contact engageable by said movable contact,
contact engageable by said movable contact, latch means
latch means engageable with said contactor and when so
engageable with said contactor and when so engaged per‘
engaged permitting operation of said contacts intoen
mitting operation of said contacts into engagement, said.
latch means when disengaged ‘from said contactor pre' 10 gagement, said latch means when disengaeed from said
contactor preventing said contacts from remaining in and
venting said contacts from remaining in and being:
being brought into engagement, said movable contact
brought into engagement, said pawl device having a porbeing mounted to a ?rst end of said contactor, said latch
tion engageable with said latch means for tripping thereof
means being engageable with a second end of said con
upon advancement of said handle from said intermediate
tactor, an elongated slot in said contactor intermediate
position while said pawl device is in said handle stopping:
said ends thereof, a stationary pin disposed Within said
position, a time delay tripping means comprising a bi
slot, said pin and said slot cooperating to guide said mov
metal element engageable with said latch means for tripable contact into and out of engagement with said sta
ping thereof, an instantaneous tripping means compris»
tionary contact, a main spring for urging said movable
ing a coil operatively positioned to have a magnetic ?eld.
contact toward engagement with said stationary contact
generated by current ?owing in said coil embrace said
when said contactor second end is engaged by said latch
latch means for tripping thereof.
means and for urging said movable contact away from
5. A circuit interrupter comprising a handle arranged
engagement'with said stationary contact after release of
to be advanced manually and returned automatically,
said contactor second end by said latch means, said main
means ‘for automatically returning the handle, a stop for"
limiting return movement of and de?ning an extreme: N: err spring engaging said contactor at a point intermediate
said second end and said slot.
position of the handle; a contactor carrying a movable
8. A circuit interrupter comprising a handle arranged
contiact movable through manual advance of said handle,
to be advanced manually and returned automatically,
a pawl device movably mounted to said handle for limit
means for automatically returning the handle, a stop for
ing return movement of the handle to an intermediate
position, the pawl device movable into and out of han 30 limiting return‘ ‘movement of and de?ning an extreme
position of the handle, a contactor carrying a movable
dle stopping position, means biasing said pawl device into
contact movable through manual advance of said handle,
handle stopping position, said contactor in moving to cir~
a pawldevice movably mounted to said handle for limit
cuit open position operating said pawl device against its
ing' return movement of the handle to an intermediate
bias out of handle stopping position and permitting move
position, the pawl device movable into and out of handle
ment of the handle to the extreme position, an indicator
stopping position, means’ biasing said pawl device into
having on and oil indicia thereon mounted to said han
handle stopping position, said contactor in moving to
tile for movement therewith, means for guiding move
circuit open position operating said pawl device against its
ment of said indicator relative to said handle whereby
bias out of handle stopping position and permitting move
only said on indicia is viewable when said handle is in
said intermediate position and only said off indicia is 40 ment of the handle to the extreme position, a stationary
contact engageable ‘by said movable contact, latch means
viewable when said handle is in said extreme position.
engageable with said contactor and when so engaged
6. A circuit interrupter comprising a handle arranged
permitting operation of ‘said contacts into engagement,
to be advanced manually and returned automatically,
said latch means when disengaged from said contactor
means for automatically returning the handle, a stop for
preventing
said contacts from remaining in and being
limiting return movement of and de?ning an extreme
brought into engagement, said handle having a cam sur
position of the handle, a contactor carrying a movable
face eng'ageable with a cam surface of said contactor
contact movable through manual advance of said handle,
whereby advancement of said handle from said extreme
a pawl device movably mounted'to said handle for limit
position is e?ective to move said contactor into engage
ing return movement of the handle to an intermediate
position, the pawl device movable into and out of handle
vstopping position, means biasing said pawl device into
handle stopping position, said contactor in moving to cir
cuit open position operating said pawl device against ‘its
bias out of handle stopping position and permitting
ment with said latch means.
'
9. A circuit interrupter comprising a handle arranged
meansengageable with said contactor and when so en
to be advanced manually and returned automatically,
means for automatically returning the handle, a stop for
limiting return movement of and de?ning an extreme
position of ‘the handle, a contactor carrying a movable
contact movable through manual advance of said
handle, a pawl device movably mounted to said handle
gaged permitting operation of said contacts into engage
for limiting return movement of the handle to an in
movementof the handle to the extreme position, a sta
tionary contact engageable by said movable contact, latch
ary, said pin disposed within said slot and cooperating
termediate position, the pawl device movable into and
out of handle stopping position, means biasing said pawl
device into handle stopping position, said contactor in
moving'to circuit open position operating said pawl device
against its bias out of handle stoppng position and per
mitting ‘movement of the'handle to the ‘extreme position,
a stationary contact engageable by said movable contact,
therewith to guide said movable contact into and out
latch means engageable with said contactor and when so
ment, said latch means when disengaged from said con
tactor preventing said contacts from remaining in and
being brought into engagement, said movable contact
being mounted to a ?rst end of said contactor, said latch
means being engageable with a second end of said con
tactor, an elongated slot and a pin one of which is station
engaged permitting operation of said contacts into en
of engagement ‘with said stationary contact.
gagement, said latch means when disengaged from said
7. A circuit interrupter comprising a handle arranged
contactor preventing said contacts from remaining in
I‘ to be advanced manually and returned automatically,
means for automatically returning the handle, a stop for 70 and being brought into engagement, said handle having
a'cam surface engageable with a cam'surface or" said con
limiting return movement of and de?ning an extreme
tactor whereby advancement of said handle from said
position of the handle, a contactor carrying a movable
contact ‘movable through manual advance or‘ said handle,
extreme position is effective to ‘move said contactor into
' apawl device movably mounted to said handle for limit
engagement with said latch means, said movable con
ing return movement of the handle to an intermediate 75 tact being mounted to a ?rst end of said contactor, said
scrapes
ill
9
latch means being engageable With a second end of said
contactor, an elongated slot in said contactor intermedi
flowing in said coil embrace said latch means for tripping
ate said ends thereof, a stationary pin disposed Within
said slot, said pin and said slot cooperating to guide said
movable contact into and out of engagement with said
thereof, a movable contact mounted to a ?rst end of said
contactor, said latch means being engageable with a sec
end end of said contact-or at a second contactor pivot
location, an elongated slot in said contactor intermediate
said ends thereof at a ?rst contactor pivot location, a
stationary contact, a main spring ‘for urging said mov
stationary pin extending from said frame and disposed
able contact toward engagement with said stationary con
‘within said slot said pin and said slot cooperating to
tact when said contactor second end is engaged by said
engage said contactor an latch and correspondingly guide
latch means and for urging said movable contact away
from engagement with said stationary contact after re 10 said movable contact into engagement with a stationary
contact; said sub-assembly characterized as being a self
lease of said contactor second end by said latch means,
contained unit, thereby permitting electrical calibration
said main spring engaging said contactor at a point inter
external to an assembled circuit interrupter containing
mediate said second end and said slot.
said sub~assembly.
10. A circuit interrupter comprising a handle arranged
13. A circuit interrupter sub-assembly comprising a
to be advanced manually and returned automatically,
means for automatically returning the handle, a stop for
frame, a contactor mounted to said frame, latch means
mounted to said frame and engageabie with said con
limiting return movement of and de?ning an extreme posi
tactor, time delay tripping means comprising a tripping
tion of the handle; a contactor carrying a movable con
bimetal mounted to said frame and normally displaced
tact movable through manual advance f said handle, a
pawl device movably mounted to said handle for limiting
from said latch means, said bimetal when subjected to
overload currents de?ecting into engagement with said
return movement of the handle to an intermediate posi
tion, the pawl device movable into
out of handle
latch means for tripping thereof, an instantaneous tripping
position, means biasing said pawl device into
means comprising a coil mounted to said frame and op~
handle stopping position, said contactor in moving to cir
erativeiy positioned to have a magnetic ?eld generated
cuit open position operating said pawl device against its
by current ?owing in said coil embrace said latch means
bias out of handle stopping position and permitting move
for tripping thereof, a movable contact mounted to a
ment of the handle to the extreme position, a stationary
?rst end of said contactor, said latch means being piv
contact engageable by said movable contact, latch means
otally engageable with a second end of said contactor at
engageable with said contactor and when so engaged
a second contactor pivot location, an elongated slot in
permitting operation of said contacts into engagement, 30 said contactor intermediate stid ends thereof at a ?rst
said latch means when disengaged from said contactor
contactor pivot location, a stationary pin extending from
preventing said contacts from remaining in and being
said frame and disposed within said slot, said pin and said
brought into engagement, said pawl device having a por
slot cooperating to engage said contactor and latch and
tion engageable with. said latch means for tripping thereof
correspondingly guide
movable contact into engage
upon advancement of said handle from said intermediate
ment w- a stationary contact, a main spring bearing
position while said pawl device is in said handle stopping
against said contactor at a point intermediate said second
position, a time delay tripping means comprising a bimetal
end and said slot; said sub~assembly hracterized as being
element engagcable with said latch means for tripping
a self-contained unit, thereby permitting electrical cali~
thereof, an instantaneous fringing means comprising a
bration external to an assembled circuit interrupter con
coil operatively positioned to have a magnetic field gen
erated by current flowing in said coil embrace said latch
taining said sub-assembly.
means for tripping thereof, said handle having a cam sur
face engageable with a cam surface of said contactor
frame, a contactor mounted to said frame, latch means
mounted to said frame and engageable with said con
whereby advancement of said handle from said extreme
position is eifective to move said contactor into engage
ment with said latch means.
ll. A circuit interrugater sub-assembly comprising a
frame, a contactor mounted to said frame at a ?rst con
tactor pivot location; a movable contact mounted to said
contactor, latch means mounted to said frame and en~
gageablc with said contactor at a second contactor pivot
location; said latch
contact-or engagement being limit
ed to corresccnd to the engagement of said movable con
tact with a stationed! contact, time delay ripping means
comprising
normally displaced
a trip, rugfrom
binietal
said mounted
latch means,
to said
frame
bimetal 55
14. A circuit interrupter sub~asseinbly comprising a
tactor, time delay tripping means comprising a tripping
bimetal mounted to said frame and normally displaced
"rem said latch means, said bimetal when subjected to
overload currents deflecting into engagement with said
latch means for tripping thereof, an instantaneous trip
means comprising a coil mounted to said frame and
operatively positioned to have a magnetic ?eld generated
by current flowing in said coil embrace said latch means
for tripping thereof, a movable contact mounted to a first
end of said contactor, said latch means being engageable
with a second end of said contactor, an elongated slot in
said contactor intermediate said ends thereof, a stationary
pin extending from said frame and disgosed with "1 said
slot, said pin
said slot cooperating to guide said mov
when subjected to overload currents deflecting into en
gagement with said latch means for tripping thereof, an
able contact into and out of engagement with a stationary
instantaneous tripping means comprising a coil mounted
contact, a main spring bearing a, net said contactor at
to said frame and operatively positioned to have a mag 60 a point intermediate said second end and said clot, said
netic ?eld generated by curr
flowing in said coil em~
latch means being pivoted to said frame and including a
brace said latch means for topping thereof; said sub-as
sembly characterized as being a self-contained unit, there
by permitting electrical calibration external to an assem
member for tripping of said latch means.
frame, a contact-r mounted to sai' frame, latch means
tactor pivot location; a movable contact mounted to said
contractor, latch
mounted to said frame and en
gageable with said contactor at a second contactor pivot
hooked extension cngageable by a manually operated
15. A circuit interrupter sub-assembly comprising a
bled circuit interrupter containing said sub-assembly.
65 frame, a contactor mounted to said frame at a ?rst con
12. A circuit interrupter 'subassembly comprising a
mounted to said frame and eugageable with said contactor,
time delay tri L
means comprising a tripping bimetal
mounted to said frame and normally displaced from said
latch means, said bimetai when subjected to overload
currents deflecting into engagement with said latch means
location; said latch and contactor engagement being
limited to correspond to the engagement of said movable
contact with a stationary contact, time delay trieping
means comprising a trigping bimctal mounted to said
frame and normally displaced from said latch means, said
bimetal when subiected to overload currents de?ecting
prising a coil mounted to said frame and operatively
positioned to have a magnetic field generated by current 75 into engagement with said latch means for tripping there
for tripping thereof, an instantaneous tripping means corn.
soreness
11
‘of, ‘an instantaneous tripping means comprising a coil
mounted to said frame and operatively positioned to have
‘a magnetic ?eld generated by current ?owing in said coil
‘embrace said latch means for tripping thereof, said frame
having a protrusion adapted to be engaged by an op
erating handle carried means for restraining the handle in
a predetermined intermediate position.
16. A circuit interrupter sub-assembly comprising a
for translational movement, an electrical sub-assembly
?xedly mounted within said case, a stationary contact
mounted within said case, ‘said electrical sub-assembly in
cluding current responsive automatic tripping means and
a contactor carrying a movable contact positioned to en
gage said stationary contact a latch means to pivotally
engage said co'ntactor; said electrical sub-assembly mount
ed to a frame for insertion as a self-contained unit into
frame, a contactor mounted to said frame, latch means
said molded casing, thereby permitting electrical calibra
mounted to said frame and engageable with said con 10 tion of said electrical sub-assembly external to said
tactor, time delay tripping means comprising a tripping
bimetal mounted to said frame and normally displaced
from said latch means, said bimetal when subjected to
overload currents de?ecting into engagement with said
latch means for tripping thereof, an instantaneous trip 15
ping means comprising a coil mounted to said frame and
operatively positioned to have a magnetic field generated
by current ?owing in said coil embrace said latch means
molded casing and ubstantially independent of dimen
sional instability of said molded casing; said handle sub
assembly having a portion engageable with said contactor
to effect engagement of said contactor and latch for op
eration of said contacts into engagement.
20‘. A circuit interrupting means comprising a molded
casing, a handle sub-assembly mounted Within said cas
ing for translational movement, an electrical sub-as~
for tripping thereof, a movable contact mounted to a
sembly ?xedly mounted within said case, a stationary
?rst end of said contactor, said latch means being engage 20 contact mounted within said case, said ‘electrical sub
able with a second end of said contactor, an elongated
assembly comprising a frame, a contactor mounted to
slot in said contactor intermediate said ends thereof, a
said frame, latch means mounted to said frame and
stationary pin extending from said frame and disposed
pivotally engageable with said contactor, time delay trip
within said slot, said pin and said slot cooperating to
ping means comprising a tripping bimetal. mounted to
guide said movable contact into and out of engagement 25 said frame and normally displaced from said latch means,
with a stationary contact, a main spring bearing against
bimetal when subjected to overload currents deflecting
said contactor at a point intermediate said second end
into engagement with said latch means for tripping there
and said slot, said latch means being pivoted to said frame
of, an instantaneous tripping means comprising a coil
and including a hooked extension engageable by a manu
mounted to said frame and operatively positioned to
ally operated member for tripping of said latch'means, 30 have a magnetic ?eld generated by current ?owing in
biasing means urging said latch means into latching posi
said coil embrace said latch means for tripping thereof,
tion; said frame having a protrusion adapted to be en
said handle sub-assembly including a portion engageable
gaged by an operating handle carried means for restrain
with said contactor to effect engagement of said contac
ing the handle in a predetermined position.
tor and latch for operation of said contacts into engage~
17. A circuit interrupter sub-assembly comprising a
ment.
'
frame, a contactor mounted to said frame at a ?rst con
21. A. circuit interrupting means comprising a molded
tactor pivot location; a movable contact mounted to said
casing, a handle sub-assembly mounted within said casing
contactor, latch means mounted to said frame and en
for translational movement, an electrical sub-assembly
gageable with said contactor at a second contactor pivot
fixedly mounted within said case, a stationary contact
location; said latch and contactor engagement being 40 mounted within said case, said electrical sub-assembly in
limited to correspond to the engagement of said movable
cluding a contactor carrying a movable contact posi
contact with a stationary contact, time delay tripping
tioned to engage said stationary contact, said handle sub
means comprising a tripping bimetal mounted‘ to said
assembly comprising a handle and a pawl device pivotally
frame and normally displaced from said latch means, said
mounted to said handle, said handle arranged to be ad
bimetal when subjected to overload currents de?ecting
vanced manually and returned automatically, means for
into engagement with said latch means for tripping there 45 automatically returning the handle, a stop for limiting
of, an instantaneous tripping means comprising a coil
return movement of and defining an extreme position of
mounted to said frame and operatively positioned to have
the handle, said pawl device limiting return movement
a magnetic ?eld generated by current ?owing in said coil
of the handle to an intermediate position, the pawl device
embrace said latch means for tripping thereof; said con
movable into and out of handle stopping position, means
tactor having a cam surface engageable by an operating
handle means for operation of said contactor into en
gagement with said latch means.
biasing said pawl device into handle stopping position,
said contactor in moving to circuit open position operat~
mg saidpawl device against its bias out of handle stop
18. A circuit interrupter sub-assembly comprising a
ping position and permitting movement of the handle to
the extreme position.
22. A circuit interrupting means comprising a molded
casing, a handle-sub-assembly mounted within said casing
for translational movement, an electrical sub-assembly
fixedly mounted within said case, a stationary contact
frame, a contactor mounted to said frame at a ?rst con~
tactor pivot location; a movable contact mounted to said
c'ontactor, latch means mounted to said frame and engage~
able with said contactor at a second contactor pivot loca
tion; said latch and contactor engagement being limited
to correspond to the engagement of said movable contact 60 mounted within said case, said electrical sub-assembly
including a contactor carrying a movable contact posi
with a stationary contact, time delay tripping means comtioned to engage said stationaryrcontact, said handle sub
prising a tripping bimetal mounted to said frame and
normally displaced from said latch means, said bimetal
assembly comprising a handle and a pawl device pivotally
mounted to said handle, said handle arranged to be ad
when subjected to overload currents de?ecting into en
gagement with said latch means for tripping thereof, an 65 vanced manually and returned automatically, means for
automatically returning the handle, a stop for limiting re
instantaneous tripping means comprising a coil mounted
turn movement of and de?ning an extreme position of the
to said frame and operatively positioned to have a mag
handle, said pawl device limiting return movement of the
netic ?eld generated by current flowing in said coil em
handle to an intermediate position, the pawl device mov
brace said latch means for tripping thereof, a temperature
compensating bimetal interposed between said tripping bi 70 Iable into and out of handle stopping position, means bias
metal' and said frame, said temperature compensating bi
metal when heated moving said tripping bimetal away
ing said pawl device into handle stopping position, said
contactor in moving to circuit open position operating said
, from said latch means.
pawl device against its bias out of handle stopping position
'19. A circuit interrupting means comprising a molded
and permitting movement of the handle to the extreme
I casing, a handle ‘sub-assembly mounted within said casing 75 position, latch means engageable with said contactor and
3,075,058
13
14
when so engaged permitting operation of said contacts
into engagement, said latch means when disengaged from
said contactor preventing said contacts from remaining
into engagement, latch means for maintaining a portion
of said contactor in an operative position such that ad
vancement of said ?rst means is effective to bring about
in and being brought into engagement, said pawl device
engagement of said cooperating contacts only when said
having a portion engageable with said latch means for
tripping thereof upon advancement of said handle from
said intermediate position while said pawl device is in said
latch means maintains the portion of the contactor in
handle stopping position.
23. A circuit interrupting means comprising a molded
said operative position, a pivot for said contactor, said
pivot being positioned intermediate the ends of said con
tactor, said ?rst cooperating contact being positioned on
one side of said pivot and said latch means engageable
casing, a handle sub~assembly mounted within said casing 10 with said contactor on the other side of said pivot, said
for translational movement, an electrical sub-assembly ?x
edly mounted within said case, a stationary contact mount
ed within said case, said electrical sub-assembly including
?rst means having a part engageable with said latch means
for tripping thereof upon advancement of said ?rst means
when said cooperating contacts are in engagement.
25. A circuit interrupter comprising a pair of cooperat
a contactor carrying a movable contact positioned to en
gage said stationary contact, said handle sub-assembly 15 ing contacts, a contactor carrying a ?rst of said cooperat
ing contacts, ?rst means operatively engageable with said
comprising a handle and a pawl device pivotally mounted
contactor for operation of said cooperating contacts into
to said handle, said handle arranged to be advanced man
engagement, latch means for maintaining a portion of
ually and returned automatically, means for automatically
said contactor in an operative position such that opera
returning the handle, a stop for limiting return movement
tion of said ?rst means is e?ective to bring about engage
of and de?ning an extreme position of the handle, said
ment of said cooperating contacts only when said latch
pawl device limiting return movement of the handle to
means maintains the portion of the contactor in said
an intermediate position, the pawl device movable into and
operative position, a pivot for said contactor, said pivot
out of handle stopping position, means biasing said pawl
being positioned intermediate the ends of said contactor,
device into handle stopping position, said contactor in
moving to circuit open position operating said pawl de 25 a slot for journaling movement of said contactor relative
to said pivot, said ?rst cooperating contact being positioned
vice against its bias out of handle stopping position and
on one Side of said pivot and said latch means engageable
permitting movement of the handle to the extreme posi
with said contactor on the other side of said pivot, said
tion, latch means engageable with said contactor and
?rst means having a part engageable with said latch
when so engaged permitting operation of said contacts
into engagement, said latch means when ‘disengaged ?rom 30 means for tripping thereof upon advancement of said
?rst means when said cooperating contacts are in en
said contactor preventing said contacts from remaining
in and being brough into engagement, said pawl device
having a portion engageable with said latch means for
tripping thereof upon advancement of said handle from
said intermediate position while said pawl device is in said 35
handle stopping position, an indicator having on and off
indicia thereon mounted to said handle for operation
therewith, said indicator having an extension extending
gagement.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,952,040
Frank et a1. _________ __ Mar. 20, 1934
2,3 85,727
Platz ________________ __ Sept. 25, 1945
2,539,567
Best ________________ __ Jan. 30, 1951
into a groove of said case constructed to guide movement
2,611,052
Platz et al. _________ __ Sept. 16, 1952
of said indicator relative to said handle ‘whereby only 40
said on indicia is viewable when said handle is in said in
termediate position and only said off indicia is vewable
when said handle is in said extreme position.
24. A circuit interrupter comprising a pair of cooper
2,656,437
2,696,541
2,816,192
2,847,533
2,863,023
2,887,548
Allen _______________ __ Oct. 20,
Habermann _________ __ Dec. 7,
Ingwersen ___________ __ Dec. 10,
Christensen __________ __ Aug. 12,
Rowe _______________ __ Dec. 2,
Middendorf __________ __ May 19,
2,895,028
Ellenberger __________ __ July 14, 1959
2,938,983
Thomas _____________ __ May 31, 1960
ating contacts, a contactor carrying a ?rst of said coop 45
crating contacts, ?rst means operatively engageable with
said contactor for operation of said cooper-ating contacts
1953
1954
1957
1958
1958
1959
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