U.S. patent number 3,742,402 [Application Number 05/077,257] was granted by the patent office on 1973-06-26 for circuit breaker with on, off, and trip indication.
This patent grant is currently assigned to Heinemann Electric Company. Invention is credited to Ralph B. Davis, Ronald Nicol.
United States Patent |
3,742,402 |
Nicol , et al. |
June 26, 1973 |
**Please see images for:
( Certificate of Correction ) ** |
CIRCUIT BREAKER WITH ON, OFF, AND TRIP INDICATION
Abstract
A circuit breaker including a case which houses a fixedly
mounted stationary contact, a movable contact carried by a movable
arm, a handle link, and a collapsible linkage mechanism coupled
between the movable arm and the handle link, the linkage mechanism
including a collapsible toggle assembly. A pair of unitary switches
are supported within an auxiliary cavity of the case and are
activated to indicate whether the circuit breaker is "on," "off" or
electrically tripped "off." The circuit breaker contacts are opened
in response either to rotation of the handle link, in which event
the linkage mechanism undergoes a first motion along a first path,
or to the occurrence of an electrical overload, in which instance
the linkage mechanism undergoes a second motion along a second path
and different from said first motion. A sensing arrangement
responds to the distinct motion of the linkage mechanism when
moving to the contacts "open" position due to an electrical
overload. The sensing arrangement comprises an actuating lever
pivotally carried by the frame of the circuit breaker and having an
upper portion adjacent the linkage mechanism, the upper portion
forming a U-shaped space defined by upper and lower arms, and a
lower portion for engaging a switch means upon rotation. During the
first motion, a driving member, secured to the toggle assembly of
the linkage mechanism, freely enters the U-shaped space of the
lever, but during said second motion the driving member engages the
upper arm, thereby rotating the lower portion of the lever into
holding engagement with one of the unitary switches. When the
contacts are subsequently closed by rotating the handle link, the
actuating lever is reset by abutment between the driving member and
the lower arm of the lever. The other of said switches responds to
the movement of the movable arm in opening and closing the
contacts.
Inventors: |
Nicol; Ronald (Trenton, NJ),
Davis; Ralph B. (Trenton, NJ) |
Assignee: |
Heinemann Electric Company
(Trenton, NJ)
|
Family
ID: |
22137019 |
Appl.
No.: |
05/077,257 |
Filed: |
October 1, 1970 |
Current U.S.
Class: |
335/13;
335/17 |
Current CPC
Class: |
H01H
71/465 (20130101); H01H 2071/467 (20130101) |
Current International
Class: |
H01H
71/46 (20060101); H01H 71/12 (20060101); H01h
073/12 () |
Field of
Search: |
;335/13,17,38,161
;337/174,79 ;200/18 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Broome; Harold
Claims
We claim:
1. A circuit breaker comprising,
a case,
a pair of contacts enclosed by said case,
a collapsible mechanism to move one of the contacts between
contacts "closed" and "open" positions,
operating means to operate said collapsible mechanism to open and
close said contacts,
a device for sensing predetermined electrical conditions and
collapsing said mechanism to trip "open" said contacts,
said collapsible mechanism undergoing a first motion along a first
path when moving from said contacts "closed" position to said
contacts "open" position under the influence of said operating
means and undergoing a second motion along a second path when
moving from said contacts "closed" position to said contacts "open"
position due to the occurrence of said predetermined condition,
and
sensing means movable in response to said second motion from an
initial position to an actuated position,
indicator means separate from and operated by said sensing means to
indicate that said contacts are in the electrically tripped "open"
position,
said sensing means comprising a lever rotatable in response to said
second motion from an initial position to an actuated position to
operate said indicator means, and
said sensing means further comprising
a driving member carried by said collapsible mechanism,and
said driving member engaging and moving said lever when said
collapsible mechanism travels through said second path.
2. The combination recited in claim 1 wherein
said lever has upper and lower portions and is pivotally supported
therebetween,
said lower portion is positioned adjacent said indicator,
said upper portion is positioned adjacent said collapsible
mechanism, and
said lever is positioned for rotation into engagement with said
indicator in response to the abutment of said driving member with
said upper portion during travel of said collapsible mechanism
through said second path.
3. The combination recited in claim 2 wherein
said upper portion of said lever has upper and lower arms which
partially define an approximately U-shaped space,
said upper arm being positioned for engagement with said driving
member during travel of said collapsible mechanism through said
second path, and
said lower arm being positioned for contacting said driving member
during movement of said collapsible mechanism from said contacts
"open" position to said contacts "closed" position after said
circuit breaker has been tripped.
4. The combination recited in claim 1 wherein
said indicator means includes a first auxiliary electrical switch
actuated by said lever.
5. A circuit breaker comprising,
a case,
a pair of contacts enclosed by said case,
a collapsible mechanism to move one of the contacts between
contacts "closed" and "open" positions,
operating means to operate said collapsible mechanism to open and
close said contacts,
a device for sensing predetermined electrical conditions and
collapsing said mechanism to "trip open" said contacts,
said collapsible mechanism undergoing a first motion along a first
path when moving from said contacts "closed" position to said
contacts "open" position under the influence of said operating
means and undergoing a second motion along a second path when
moving from said contacts "closed" position to said contacts "open"
position due to the occurrence of said predetermined condition,
and
sensing means movable in response to said second motion from an
initial position to an actuated position, and
indicator means separate from and operated by said sensing means to
indicate that said contacts are in the electrically "tripped open"
position,
said sensing means comprising a lever rotatable in response to said
second motion from an initial position to an actuated position to
operate said indicator means, and
said indicator means including
a first auxiliary electrical switch actuated by said lever, and
a second auxiliary electrical switch for indicating whether said
contacts are "open" or "closed."
6. The combination recited in claim 5 wherein said first and second
auxiliary switches each comprise independent units supported by
said case.
7. The combination recited in claim 6 wherein said first and second
switches are in side-by-side relationship.
8. The combination recited in claim 7 further including
electrical lamps coupled to said first and second switches and to a
source of electrical potential for illumination in response to the
actuation of said switches so as to indicate whether said contacts
are "open," "closed" or electrically tripped "open."
9. A circuit breaker comprising,
a case,
a pair of contacts enclosed by said case,
a collapsible mechanism to move one of the contacts between
contacts "closed" and "open" positions,
operating means to operate said collapsible mechanism to open and
close said contacts,
a device for sensing predetermined electrical conditions and
collapsing said mechanism to "trip open" said contacts,
said collapsible mechanism undergoing a first motion along a first
path when moving from said contacts "closed" position to said
contacts "open" position under the influence of said operating
means and undergoing a second motion along a second path when
moving from said contacts "closed" position to said contacts "open"
position due to the occurrence of said predetermined condition,
and
sensing means movable in response to said second motion from an
initial position to an actuated position,
indicator means separate from and operated by said sensing means to
indicate that said contacts are in the electrically "tripped open"
position,
said sensing means comprising a lever rotatable in response to said
second motion from an initial position to an actuated position to
operate said indicator means, and
said indicator means including a first auxiliary electrical switch
actuated by said lever, and
retaining means on said lever and said switch for maintaining said
switch actuated after said contacts are in the contacts "open"
position and said collapsible mechanism is reset.
10. The combination recited in claim 9 further including
reset means operating in response to the subsequent movement of
said collapsible mechanism to the contacts "closed" position to
release said lever from engagement with said switch and return it
to its initial position.
11. The combination recited in claim 10 wherein
said retaining means comprises an operating button located on said
first switch for actuating said switch,
said button being biased toward, but movable away from, said lever,
and
a detent located on said portion of said lever,
whereby upon rotation of said lever toward said switch, said button
becomes trapped within said detent to thereby retain said switch in
an actuated state.
12. The combination recited in claim 11 wherein
said reset means includes a spring for biasing said lever toward
said initial position.
13. A circuit breaker comprising,
a case,
a pair of contacts,
a circuit breaker assembly enclosed within said case for moving
said contacts between "open" and "closed" positions,
said assembly including a collapsible linkage, means for collapsing
said linkage in response to a preselected electrical condition, and
means for automatically resetting said linkage subsequent to the
collapse thereof,
two pivotal lever parts pivoted about a common axis and mounted
within said case,
said assembly being engageable with one of the lever parts during
electrical tripping thereof and engageable with the other lever
part during movement from the contacts "off" to the contacts "on"
positions subsequent to being electrically tripped, and
unitary switch means carried by said case and responsive to the
movement of said assembly and of said lever for indicating whether
said circuit breaker is "on," "off" or electrically "tripped
off."
14. The circuit breaker recited in claim 13 wherein,
said unitary switch means comprises two unitary auxiliary
switches,
one of said switches for indicating whether said circuit breaker is
"on" or "off," and the other of said switches for indicating
whether said circuit breaker is electrically tripped "off."
Description
BACKGROUND OF THE INVENTION
This invention relates generally to improvements in electric
circuit breakers of the electromagnetic type and more particularly
to an improved arrangement for indicating the condition of said
circuit breakers.
Circuit breakers of the electromagnetic type are well-known, for
example, one such circuit breaker is shown in Camp Pat. No.
3,329,913, assigned to the Heinemann Electric Company. Circuit
breakers of the above mentioned type generally comprise a movable
contact, mounted on a movable arm, and a rigidly mounted stationary
contact. An operating handle link is coupled to the movable arm via
a linkage mechanism, part of the linkage mechanism comprising a
collapsible toggle assembly. The movable and stationary contacts
are operated between the contacts "open" and the contacts "closed"
positions through rotation of the operating handle. The circuit
breaker further contains an electromagnetic device which, in
response to predetermined electrical conditions, collapses the
toggle assembly to thereby electrically trip "open" the
contacts.
It is desirable, therefore, in circuit breakers of the above
mentioned type to incorporate an arrangement which discloses the
condition of the circuit breaker as being "on" (circuit breaker
contacts "closed"), "off" (circuit breaker contacts "open") or
electrically tripped "off" (circuit breaker contacts "open" due to
an overload condition).
BRIEF SUMMARY OF THE INVENTION
The present invention is a circuit breaker of the type disclosed in
U.S. Pat. No. 3,329,913 and, in addition, incorporates an
arrangement for indicating whether the circuit breaker is "on,"
"off" or electrically tripped "off."
The arrangement for indicating the condition of the circuit breaker
comprises an electrical switch means compactly located within the
circuit breaker case and responsive to the two distinctive
movements of the circuit breaker linkage mechanism. The switch
means is composed of two unitary auxiliary switches arranged
side-by-side and contained within an auxiliary cavity of the case.
The switch means is located approximately intermediate the main
terminals of the circuit breaker with the terminals of the switch
means extending generally in the same direction as the main
terminals. A first of said unitary switches indicates the normal
"on" and "off" conditions of the circuit breaker while a second
indicates the electrically tripped "off" condition.
The first switch responds to the uncollapsed movement of the
linkage mechanism, such as in manually moving the handle so as to
open and close the contacts, whereas the second switch responds
only to the movement of the contacts to the open position after the
mechanism has been tripped, i.e., collapsed, on the occurrence of
predetermined electrical conditions.
BRIEF DESCRIPTION OF THE VIEWS
In the drawings:
FIG. 1 is an enlarged side elevation of the circuit breaker of the
invention with one of the half-cases partially broken away to
expose the operating assembly in the contacts "closed" position,
the auxiliary cavity containing the auxiliary switches, and the
element for actuating the "on-off" auxiliary switch;
FIG. 2 is a side elevation of the circuit breaker shown in FIG. 1,
the view being taken similarly to FIG. 1, but showing the opposite
side of the operating assembly and the operating elements for
actuating the "electrical trip" auxiliary switch;
FIG. 3 is a sectional view taken along the line 3--3 in FIG. 2
showing the side-by-side placement of the auxiliary switches and
the operating elements for actuating the auxiliary switches;
FIG. 4 is a side elevation view similar to FIG. 2 but with the
frame plate partially broken away and the actuating lever return
spring omitted, showing the positions of the elements for actuating
the electrical trip auxiliary switch when the circuit breaker
contacts are in the contacts "closed" position;
FIG. 5 is a side elevation view similar to FIG. 4 showing the
positions of elements for actuating the electrical trip switch,
when the circuit breaker contacts are in the contacts "open"
position;
FIG. 6 is a side elevation view similar to FIG. 4 illustrating the
collapsing movement of the toggle assembly and the final position
of the actuating lever in engagement with the electrical trip
auxiliary switch;
FIG. 7 is a side elevation view similar to FIG. 4 showing the final
position of the collapsible linkage after completion of the
collapsing movement with the actuating lever shown in its final
position in engagement with the electrical trip auxiliary switch;
and,
FIG. 8 is a schematic wiring diagram illustrating the electrical
connections between the auxiliary switches of the circuit breaker
of this invention and lamps to indicate the condition of the
contacts.
DETAILED DESCRIPTION
Referring to the drawings, and in particular to FIGS. 1, 2 and 3,
this invention comprises a circuit breaker 10 having a casing 40
which houses a circuit breaker assembly 41. An auxiliary switch
means 11, comprised of switch units 16 and 26, is supported within
an auxiliary cavity 33 of the casing 40 and located adjacent the
circuit breaker assembly 41.
The basic operation of the circuit breaker assembly 41 is described
in detail in U.S. Pat. No. 3,329,913, among others, hence, only a
brief description will be given hereinafter.
The assembly 41 comprises a movable contact 42 carried by a movable
arm 43 and engageable with a stationary contact 44, the latter
carried by a terminal 45. The movable arm 43 is connected by
flexible conductor 47 to one end of a coil 48 forming part of an
electromagnetic device 50. The electromagnetic device 50, on
predetermined electrical conditions, causes the collapse of the
linkage mechanism 51 to trip open the contacts 42 and 44. The
electrical circuit of the circuit breaker is completed by
connecting the other end of the coil 48 to the terminal 46.
Further, the movable arm 43 is biased by a spring 52 toward the
open position of the contacts 42 and 44 and is mounted on a pin 53
about which it pivots, the pin 53 being carried by two spaced
plates 54 which are integral with an L-shaped member 56 and jointly
form a frame 59 for carrying the coil 48. The end portions of the
pin 53 extend into holes formed in the opposed side walls of the
half-cases 37 and 38 to properly locate and support the mechanism
41 inside the casing 40. Another pin 62, carried by the movable arm
43, has end portions which engage the spaced plates 54 to limit the
opening movement of the arm 43, as shown in FIG. 1.
The movable arm 43 is also connected by a pin 57 to the linkage
mechanism 51 which includes a collapsible toggle assembly 58 having
a toggle plate 68 and a toggle link 69, the latter being in turn
connected to an arm 65 of the pivotal handle link 60 by a pin 61.
The handle link 60 is formed with an integral handle 15 and pivots
about a pin 64 having its end portions also carried by the spaced
plates 54. A spring 55 is coiled on the pin 64 and has one end
attached to one of the frame plates 54 and the other end of the
spring 55 is in contact with the pin 61, the spring being stressed
at all times so as to bias the handle link 60 in the
counterclockwise direction, FIG. 1, to the contacts "open" (circuit
breaker "off") position. After tripping of the linkage mechanism 51
in response to an overload, for instance, the link spring 55
automatically moves the handle link 60 from the contacts "closed"
(circuit breaker "on") position to the contacts "open" (circuit
breaker "off") position and relatches the toggle assembly 58.
The frame 59 forms a part of the electromagnetic device 50 to which
is secured a time delay tube 63 housing a spring biased
magnetizable core (not shown) movable against the retarding action
of a suitable fluid to provide a time delay before tripping of the
mechanism on certain overloads.
The operation of this type of linkage mechanism 51 and
electromagnetic device 50 is specifically set forth in U.S. Pat.
No. 3,329,913 and for purposes of brevity it will only be generally
described herein as follows-- as the pivotal link 60 is moved from
the contacts "open" position to the contacts "closed" position by
pivoting the handle 15, the toggle assembly 58 and the movable arm
43 all move down, against the bias of the spring 52, and move the
contact 42 into engagement with the stationary contact 44 achieving
the contacts "closed" (circuit breaker "on") position, illustrated
in FIG. 1.
The electromagnetic device 50 includes an armature 70 which is
pivoted on a pin 74 whose end portions are also carried by suitable
holes in the frame plates 54. Upon the occurrence of a
predetermined overload condition, assuming the circuit breaker to
be in the contacts "closed" position, the armature 70 is attracted
toward the pole piece 72, either after a time delay period or
virtually instantaneously, depending on the overload condition. The
movement of the armature 70 toward the pole piece 72 causes the
oppositely extending trip finger 71, which is integral with the
armature 70, to pivot to the right as seen in FIG. 1 and engage and
trip the arm 75 forming part of the linkage mechanism 51, whereupon
the toggle assembly 58 collapses and the movable arm 43 moves
upward under the bias of the spring 52 to open the contacts 42 and
44. The collapsing motion of the toggle assembly 58 is independent
of the position of the handle link 60 and handle 15. The handle
link 60 is then moved to the contacts open position, under the
pressure applied by the spring 55, which simultaneously relatches
the toggle assembly 58.
The casing 40 consists of two approximate half-cases 37 and 38
which form a main cavity for housing the circuit breaker assembly
41. In addition to the main cavity in which the assembly 41 is
located, the casing 40 provides for an auxiliary cavity 33 in which
an auxiliary switch means 11 is located. A more detailed
description of the construction of the casing 40 to provide for the
auxiliary cavity is given in U.S. Pat. No. 3,329,793. Briefly,
however, the auxiliary cavity 33 is formed by extending one pair of
abutting peripheral walls forming part of the half-cases 37 and 38
outwardly to form an opening. The auxiliary cavity 33 is located on
the margin of the casing 40 containing the circuit breaker
terminals 45 and 46 and is intermediate these terminals.
The auxiliary switch means 11 comprises two auxiliary switches 16
and 26. The switch 16 is operated only in response to the movement
of the movable arm 43 to indicate whether the circuit breaker is
"on" or "off." The switch 26 is operated only in response to the
distinct motion of the linkage mechanism during its collapsing
movement from the contacts "closed" to the contacts "open" position
in response to an overload condition to indicate whether the
circuit breaker is in the electrically tripped "open" condition.
The switches 16 and 26 are arranged in a side-by-side relationship
in the auxiliary cavity 33 of the circuit breaker casing 40.
The casings of each of the auxiliary switches 16 and 26 contain two
holes, the holes in the casing of switch 16 being aligned with the
holes in the casing of switch 26. Two pins 35 and 36 are threaded
through the aligned holes in the switch casings, the ends of pins
35 and 36 being supported in aligned recesses in the inner walls of
the two half-cases 37 and 38. Auxiliary switches 16 and 26 are
located within the auxiliary cavity 33, on opposite sides of the
plane in which the movable arm 43 moves and approximately
equidistant therefrom.
The auxiliary switch 16 carries three terminals 17, 18 and 19, and
operates as a single pole double throw switch to connect the common
terminal 19 with either the terminal 17 or 18. The switch 16 is
controlled by an operating button 20 which protrudes above the end
of the switch 16 adjacent the movable arm 43 of the circuit
breaker, and extends into the interior of the auxiliary switch 16
to control the mechanical switching function. The button 20 is
normally biased upwardly to a position such that the common
terminal 19 is internally connected to terminal 17. In this
position it is indicative of the contacts "open" position of the
circuit breaker.
A generally L-shaped operating arm 21 is secured to the lower
portion of the movable arm 43 and extends laterally therefrom in
the direction of the switch 16, FIGS. 1 and 3. The arm 21 overlies
the button 20 and is located such that as the movable arm 43 moves
downwardly to close the contacts 42 and 44, the arm 21 depresses
the button 20 of the switch 16, thereby operating the switch 16 to
the position indicative of the contacts "closed" position, in which
position the electrical circuit is closed between terminals 19 and
18 and is open between the terminals 19 and 17. As the movable arm
43 moves upwardly, the operating arm 21 releases the button 20
which, since it is biased upwardly, again operates the switch 16 to
the position indicative of the contacts "open" position, in which
the electrical circuit is closed between the terminals 19 and
17.
The auxiliary switch 26 is identical to switch 16 and is responsive
to the distinctive collapsing motion of the linkage mechanism 51
during electrical tripping to indicate that the contacts have been
"opened" in response to electrical tripping thereof. The switch 26
carries the terminals 27, 28 and 29, FIG, 2, and is operated by an
operating button 30. The operating button 30 is similar to the
button on switch 11 and is depressed during the tripping movement
of the linkage mechanism 51 by means of the actuating lever 80 and
held depressed until the movable contact is again moved toward the
contacts "closed" position, FIGS. 2 and 3.
The lever 80 is pivotally mounted between the frame plates 54 on a
pin 83, and lies in approximately the same plane occupied by the
operating button 30 on the auxiliary switch 26. The end portions of
the pin 83 are supported by holes in the frame plates 54. A spring
81 is carried by the pin 83 and has one end attached to the frame
plate 54 and its other end bearing against the portion of the lever
80 nearest the switch 26, thereby continuously biasing the lever
toward rotation in the counterclockwise direction, away from the
button 30. The counterclockwise rotation of the lever 80 is limited
by abutment with the frame 59 of the circuit breaker. The lower
portion of the lever 80 has a detent 85 formed thereon to hold the
button 30 in the engaged position, as explained more fully
hereinafter.
The upper portion of the lever 80 has a generally U-shaped space 90
defined by lower reset arm 87 and upper actuating arm 97, with the
open end of the U-shaped space 90 extending in the general
direction of the movable arm 43. The upper actuating arm 97 has a
cam portion 98 and a shoulder 99 located near the base of the
U-shaped space 90.
A V-shaped trip link 105 is mounted in approximately the same plane
in which the lever 80 moves. The apex of the V-shaped link 105 is
fixedly secured to the movable arm 43 by the same pin 57 which
attaches the movable arm 43 to the linkage mechanism 51, with the
open end of the V-shaped link extending generally in the direction
of the U-shaped space 90.
One arm 107 of the V-shaped link 105 has a stud 109 which extends
through a hole in the toggle plate 68. The interfitting stud 109
and hole in conjunction with the apex serve to rigidly mount the
V-shaped link 105 to the toggle plate 68 of the linkage mechanism
51. A driving member 114 is located on another arm 110 of the
V-shaped link 105 and extends in a direction perpendicular to the
plane occupied by the link 105. As expained more fully hereinafter,
the driving member 114, during the collapsing movement of the
linkage mechanism 51, enters the space 90 and engages the cam
portion 98 of the upper actuating arm 97 to rotate the lever 80
clockwise and operate the switch 26 by depressing the button
30.
In operation, assuming the contacts 42 and 44 to be in the "open"
position, when the handle link 60 is moved in a clockwise direction
by means of the handle 15, the movable arm 43 and its operating arm
21 and movable contact 42, move downward toward the stationary
contact 44. As the movable contact 42 engages the stationary
contact 44, the operating arm 21 engages and depresses the
operating button 20 on the auxiliary switch 16, thereby indicating
that the circuit breaker contacts are "closed," (circuit breaker
"on").
Assuming the contacts 42 and 44 to be closed, if the handle link 60
is moved counterclockwise by rotating the handle 15 the movable arm
43, the operating arm 21 attached thereto and the movable contact
42 will all move upward, away from the stationary contact 44.
During this upward movement the operating arm 21 will disengage
itself from the operating button 20, thereby allowing it to be
moved upwardly to a position indicative of the contacts "open"
position, (circuit breaker "off").
The movement of the V-shaped link 105 relative to the actuating
lever 80 in response to the above discussed pivoting movements of
the handle 15 in manually turning the circuit breaker "on" and
"off" is illustrated in FIGS. 4 and 5. FIG. 4 illustrates the
position of the V-shaped link when the contacts 42 and 44 are
"closed" while FIG. 5 shows the position of the V-shaped link 105
after the contacts have been completely opened. The dotted line
labeled B in FIG. 4 traces the path of movement of the driving
member 114 of the V-shaped link 105 in going from the position
shown in FIG. 4 to the position seen in FIG. 5. Thus, when the
movable arm 43 is moved from the contacts "closed" position, FIG. 4
(circuit breaker "on"), to the contacts "open" position, FIG. 5,
(circuit breaker "off"), through rotation of the handle link 60,
the driving member 114 on the V-shaped link 105 moves through the
open end of the space 90 and into the shoulder 99 on the upper arm
97 of the lever 80, dotted line B of FIG. 4, without contacting the
cam portion 98. Without contact between the driving member 114 and
the upper portion of the actuating lever 80, no pivotal movement is
imparted to the lever 80 and it remains in its initial reset
position, FIG. 5, due to the biasing action of spring 81.
However, if the contacts are moved from the "closed" position to
the contacts "open" position by virtue of the collapsing action of
the linkage mechanism 51 in response to an overload, the driving
member 114 on the V-shaped link 105 follows generally a second path
illustrated by the dotted line A in FIG. 4. This results from the
distinct collapsing movement of the toggle assembly 58 of the
linkage mechanism 51. More specifically, when the toggle assembly
58 collapses, the toggle plate 68 moves in an upward direction
under the bias of spring 52 and simultaneously moves in an outward
direction away from the frame plate 54, as illustrated in FIG. 6.
As a result of this upward and outward movement of the toggle plate
68, the V-shaped link 105 is rotated slightly in a counterclockwise
direction while moving generally upward, such that the driving
member 114 traverses the path labeled A in FIG. 4 and strikes the
cam portion 98 of the upper arm 97, thereby rotating the lower
portion of the actuating lever 80 clockwise about the pivot 83
(FIG. 4) toward the operating button 30 of switch 26. FIG. 6
illustrates the momentary engagement between the driving member 114
and the cam portion 98 of the upper arm 97 when the toggle assembly
58 is in its transient collapsed position prior to its being reset,
while FIG. 7 shows the position of the driving member 114 when the
toggle plate 68 has moved to its final position and the toggle
assembly 58 has been reset.
As the lower portion of the actuating lever 80 rotates clock-wise
it depresses the button 30 of the auxiliary switch 26 and latches
or holds it depressed, the depressed position being indicative of
the electrically tripped condition of the circuit breaker 10. The
tip of the button 30 becomes trapped in the detent 85 in the lower
portion of the actuating lever 80, holding the lever 80 in the
position shown in FIG. 7 while the collapsed linkage mechanism is
automatically reset by the action of the spring 55, FIG. 1 which
biases the handle 15 from the "on" position, FIG. 4, to the "off"
position shown in FIG. 7. It should be noted that the movement of
the lever 80 in response to an overload is completely independent
of the position of the handle 15. Therefore, even if the handle 15
were forcibly retained in the circuit breaker "on" position, FIG.
1, the lever 80 would operate switch 26 to indicate the trapped
condition of the circuit breaker.
The switch 26 will remain in the position shown in FIG. 7 until the
operating handle 15 is moved to the "on" position at which time the
lever 80 will be reset. Assuming that the contacts have been
electrically tripped "open," when the movable arm 43 moves downward
to close the contacts, the driving member 114 will follow a path
indicated by the dotted line C in FIG. 7 and will bear against and
pivot counterclockwise the lower reset arm 87 of the lever 80,
thereby rotating the lever 80 counterclockwise out of engagement
with the button 30 toward its initial position, shown in FIG. 4.
The reset motion of the actuating lever 80 is completed by the bias
spring 81 which moves the lever 80 to its initial position, as
shown in FIG. 2, the spring 81 being omitted from FIGS. 4 and 5 for
clarity.
An electrical circuit for use with the invention is illustrated
schematically in FIG. 8. Four indicator lamps 130, 131, 132, and
133 and five associated terminals 134, 135, 136, 137 and 138 are
wired together as shown in the schematic of FIG. 8. The "on-off"
auxiliary switch 16, carrying the terminals 17, 18, and 19 is wired
so as to have its common terminal 19 connected to one side of a
power supply. The terminal 18 on the switch 16 is connected to one
side of the lamp 132, the other side of the lamp 132 being
connected to the terminal 134 which in turn is coupled to the other
side of the supply. The terminal 17 on the auxiliary switch 16 is
connected to the common terminal 29 on the electrical trip
auxiliary switch 26. The lamps 130 and 131 are coupled in parallel
with each other and in series with the terminal 28 on switch 26 on
the other side of the supply via the terminal 134. The terminal 27
of the switch 26 is connected to one side of the lamp 133, the
opposite side of which is also coupled to the supply via terminal
134.
Assuming the contacts 42 and 44 to be in the "open" position,
(circuit breaker "off"), the switches 16 and 26 will be in the
positions shown by the solid lines in FIG 8. In this position, it
is seen that the lamp 133 is in series with the supply, the series
path extending from one end of the supply, through terminals 19,
17, 29, 27, 137, lamp 133, terminal 134 to the other end of the
supply. The lamp 133 is therefore designated as the "off" lamp, and
is illuminated when the circuit breaker contacts 42 and 44 are
"open," and the circuit breaker is "off" or deactivated.
When the circuit breaker is turned on by moving the handle 15 to
the "on" position, FIG. 1, the contacts 42 and 44 will close. As
the movable arm 43 moves downward, the lever arm 21 will operate
the switch 16, as explained hereinbefore to the position shown by
the dotted line in FIG. 8. The switch 26 remains in the position
shown by the solid line, FIG. 8. With the switch 16 in the position
shown by the dotted line, the 132 will be illuminated since it is
in series with the supply, the series path consisting of the
supply, the terminals 19, 18, 138, the lamp 132, and the terminal
134. The lamp 132, therefore, is designated as the "on" lamp since
it is illuminated when the contacts are in the "closed" position,
FIG. 1, (circuit breaker "on").
If an overload occurs the electromagnetic device 50 of the circuit
breaker will collapse the linkage mechanism 51, causing the movable
arm 43 and the operating arm 21 to move upward which results in the
switch 16 reassuming the position shown by the solid line in FIG.
8. Concurrently, as the linkage mechanism 51 collapses the lever
arm 80 is rotated in a clockwise direction thereby operating the
electrical trip switch 26, as explained in detail hereinbefore with
reference to FIGS. 4-7. The switch 26 will, therefore, assume the
position shown by the dotted line in FIG. 8. Under these
conditions, the parallel combination consisting of lamps 130 and
131 will be in series with the supply, the series circuit extending
from one side of the supply through terminals 19, 17, 29, 28
through the parallel combination of lamps 130 and 131, the terminal
134 to the other side of the supply. Thus, the lamps 130 and 131
will be illuminated when the contacts 42 and 44 have been tripped
to the "open" position as a result of an overload and thus are
designated "electrical trip" lamps. The lamps shown in FIG. 8 may
be mounted near the circuit breaker or alternately may be located
at a more remote monitoring station.
* * * * *