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Патент USA US2106580

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Jan. 25, 193s.‘v
AVFJ. THOMSON
2,106,580
cmcuzr BREAKER
Original‘ F11ed_ March a, 71.933
2 sums-shut 1'
qu
INVENTOR'S
Jan. 25, 1938.
A. J.‘ THOMSON
2, 106,580
cmcuzr BREAKER
Original Filed March 6, 1933
BY
2 Sheets-Sheet 2
2,106,580
Patented Jan. 25, 1938 _
' UNITED- STATES
PATENT OFFICE '
2,106,580
,
cnwurr BREAKER
Alfred J. Thomson, Detroit, Mich, assignor to~ .
Bulldog Electric Products Company, Detroit,
Mich, a corporation of West Yirginia
.
.Original application March a,‘ 1933, Serial No.
659,714. Divided and this application .Jan
uary 9, 1936, Serial No. 58,438
I
,
,
9 Claims. (01. 200-116)
This application relates to circuit breakers and ing description and the accompanying drawings,
is a divisional of my prior application Serial No. in which,
'
Figs. 1~3a are plan, end, elevation, and dia
659,714, filed March 6, 1933.
The instant .application discloses a circuit grammatic views of a breaker, shown in on posi
5 breaker having an actuating or operating mecha
tion;
1
nism to which is connected a contact and a
handle. Normally the handle is positively con
nected to the operating mechanism to which is
also positively connected the contact and move
” ment of the handle positively causes movement
of the mechanism and consequent movement of
the‘ contact for manual switching.
On overload operation, the positive connection
between the handle and the mechanism is de-'
stroyed automatically so that overload movement
of the actuating mechanism and consequent
movement of the contact may take place with
out the necessity for causing or being accom
panied by corresponding movement of the han
20 die; in the instant breaker, there is a latch
which normally positively connects the handle
and the mechanism but which is- automatically
‘
disengaged by overload release movement of the >
mechanism itself to disconnect the mechanism
5
Figs. 4 and 5 are elevation and end views of a
group of details of the mechanism thereof, in on
position;
.
Figs. 6 and 'l are elevation viewslof the breaker,
in o?' and overload of! positions, respectively;
10
Fig. 8 is an elevation view, like Fig. 4, but with
the parts shown in overload oil position.
In the drawings there is shown a breaker hav
ing the operating mechanism of my prior ap
plication and having a handle and a contact con- 15
nected thereto. Normally connecting the handle
and the mechanism is a latch; this latch is auto
matically released on overload release movement
.of the mechanism itself to destroy the normal
operative connection between the handleand the 20
mechanism, whereupon the mechanism and its,
contact may move free of the handle on overload
release.
1
,
I
As stated above, the breaker operating mecha
nism in general resembles that of my prior ap- 25
plication Serial No. 659,714 and has many parts
sidered that the handle is normally connected which are similar to‘ the identically numbered
to the mechanism positively and is completely ‘ parts of that breaker. For example, both break
25 from the handle.
-
While in the ordinary sense it may be con
disconnected therefrom automatically on over
,0 load release movement of the parts, it may be
considered that for normal operation the handle
is connected to the mechanism in such a manner
that substantially no lost motion between the
handle and the mechanism exists, the operation
ers have a base ill, a warping element H, a front
plate 2|, an operating link 24, a spring 21 there- 30
on, between pin 28, and a link 29 connected at
3| to a pawl 32 pivoted at 33, the pawl having an
end 35 for engagement by tongue 36 of the warp
ing element. The left end 31 of link 24 is con
nected to the drum-like crank 38 by pin 39 riding 35_
in slot 4| of the crank, the latter having a handle
increase in the amount of lost motion between ' 42, and being supported on shaft 43 connecting
the handle and the mechanism so that the .' the front plate 2| to the back plate 43a andhav
mechanism may move free of the handle, the ing pin A riding in slot B in front plate 2|.
35 of the parts, however, being such that an over
load release automatically causes a tremendous ,
40 handle not following or accompanying the mech
anism due to the great lost motion that is auto
matically caused to exist between the handle and
the mechanism following overload release. ,
'
The invention is embodied in a trippable or
45 releasable latch between the operating handle
of a circuit breaker and the quick acting mecha
nism of the same, to which mechanism is con-.
nected a contact. The mechanism per se and
the general arrangement of the parts is substan
50 tlally that disclosed in my prior application Serial
No. 659,714.
'
For an understanding of the herein illustrated
breaker which includes the operating mechanism
of my prior application and embodies my instant
s5 invention, referenceshould be had to the follow
The crank further has a lug 44 to engage a 40
stop 45 on the pawl, and there is also provided
a pawl stop ledge 41 on a pawl stop 48.
In addition to the foregoing parts, the breaker
of this case is provided‘ with certain novel de—
tails, now to be described.
- 45
On base Ill are contacts |l| adapted to be en
gaged by the bridging contact || 2 on one end of
contact arm || 3, the contacts ||| being con
nected to the load and to the warping element
M, respectively.
50
The other end of arm I i3 is enlarged and is dis
posed within the drum~like bell crank 38 (Fig. 4)
and is also journalled on cross shaft 43.. The arm
may be latched to the bell crank, so as to move
therewith by a plate H5 through which passes 35
2
9,100,000 1
pin 39 on the end of link 24, the pin riding in a
slot II‘! of the contact arm aligned with slot 4i
overload element I4. During this movement, pin
of the crank, the plate having an edge notch III
in which may be disposed a latch H9, journalled
by means of its lugs I29 riding in holes I2I of
the drum-like crank, ‘and held down in notch
H8 by a tension spring I22 connecting the latch
39 rides free in slot 4I. Movement of the handle
42 also rotates latch H9 in crank 38 until it
aligns with slot I II in member I I 5, whereupon the
spring I22 pulls latch H9 in the slot I I9, again
latching member Hi, to crank member 39. Also,
the resetting movement of pawl 32 frees end I29,
and a pin I23 on the contact arm H3.
allowing latch H9 to engage slot H9.
_
The parts just described may be operated as
~ Contact arm H3 does not move out of the oi!
'10 a simple quick make and break switch as follows: - position, being held in that position through the 10
When handle 42 is moved to the right from on medium of link 24 and pin 39 together with
position, Figs. 3, 3a, and 4,‘ left end 39 of link 24
is moved up and to the left compressing spring
21. While pin 39 is riding in slot I II of switch
15 arm H3 and tensioning spring I22, switch arm
H3 is being held by frictional engagement of
the stationary contacts I H with movable contact
II2.
.
-
After link 24 gets overcenter 43, spring 21
acts to complete the clockwise movement of left
end 39 and handle 42. Switch arm H3, through
the influence of spring 21 assisted by spring I22,
effects a quick break of the movable contact H2
from the stationary contacts III.
Reverse movement of handle 42 from off posi
tion, Fig. 6, causes left end 39 of link 24 to move
counterclockwise and to the left, tensioning spring
21 and also moving with it, contact arm H3.
After link 24 moves overcenter 43, spring 27 re
30 acts to cause quick make of'the movable con
tact I I2 to the stationary contacts I I I. The posi
tive connection through the medium of the latch
H9, the plate H5, and the pin 39 insures positive
make and break.
35
.
To the foregoing are added parts for moving
the contact arm on overload trip independently
of, and without requiring movement of, the han
die 42, and these will now be described. In the
crank 38 there is disposed a slidable plate I28
guided by, and whose slot I21 receives, the cross
shaft 43. This plate has an extension I29 at one
end passing through a slot I29 of the drum crank
38 and its other end is positioned to engage the
latch I I9.
The overload trip operation of these parts is
shoulder 53 of link 24 pressing against the lug
92 of link 29. The reset action therefore places
all the parts in oil’ position.
It will be observed that normally the handle 15
42 is positively conected to the operating mecha
nism, with little or no lost motion between the
parts through the latch I I9. On overload release
movement of the parts, however, the handle is
disconnected from the operating mechanism so
that there is great lost motion between the han
dle and the mechanism and so that the mecha
nism may move free of the handle, and such dis
connection is accomplished by raising of latch I I9
out of the notch H9 in member H5 of the oper
ating mechanism; this is accomplished by the
engagement of the latch controlling part I 29 by
the pawl extension I39, which pawl extension
moves up on overload release of the parts to
strike latch-control member I28 and raise latch
H9 out of the notch H9 in member H5.
I claim:
'
1. In a circuit controller, a contact, quick act
ing circuit opening and closing mechanism posi
tively connected thereto and so constructed as to
have a normal tendency to move the contact and
thus open the circuit when permitted so to do,
holding means for the mechanism and arranged
to release it on overload and permit it to operate
for circuit opening, a handle for ‘operating the 40
mechanism for circuit opening or closing even
when the mechanism is held by the holding
means, and rigid but releasable means normally
positively connecting the handle and the mecha- -
as follows: When the element I4 warps to the
nism and automatically released by overload re
lease movement of the holding means for discon
right, it releases pawl 32; the latter is then
snapped upwardly by spring 27. The link 24 also
necting the handle and the mechanism, whereby
the mechanism may operate the contact for cir
moves with pawl 32 about pin 39 as a. fulcrum.
50 The extension I28 of plate I26 is engaged by the
pin 39 to rotate clockwise under the combined
cuit opening free of the handle and even if the
latter be held,_the holding means for the mecha
nism being separate and independent of the rigid
but releasable means for'connecting the mecha
nism and the handle and also being remote from
in?uence of springs I22 and 21 and through the
such rigid and releasable means.
movement of switch arm H3, forcing movable ‘
2. In a circuit- controller, acontact, quick act
ing circuit opening and closing mechanism posi
extension I30 of pawl 32 and is forced upward
to release latch H9 from notch II 9, and allowing
56
contact H2 away from stationary contacts III
to effect a quick break of the circuit. Arm II3
moves independently of crank 33, for a trip free
action, by virtue of the fact that pin 39 can ride
60 freely in slot 4i of the crank. Movement of crank
39 is limited by the riding of its pin A in the slot
B of the front plate 2|. The characteristic that
arm H3 can move independently of crank 38, so
that arm H3 can move to break the circuit even
65 though the crank 38 is held manually in on posi
‘
5s,
tively connected thereto and so constructed as to
have a normal tendency to move the contact and
thus open the circuit when permitted so to do,
holding means for the mechanism andarranged
to release it on overload and permit it to operate
for circuit openingha handle for operating the
mechanism for circuit opening or closing even
when the mechanism is held by the holding
means, and rigid but releasable means normally
tion, places the breaker in the trip free class.
positively connecting the handle and the mech
Excess movement of pawl 32 is prevented, not, anism and automatically released by'the mecha
only by stop ledge 41, but also by the engagement nism itself following a movement thereof re
of pawl extension I30 with van extension I3I
70 formed on contact arm H3 and projecting
sponsive to overload release movement of the
holding-means for disconnecting the handle and
through slot I29.
,
the mechanism, whereby the mechanism may op
For resetting the parts to normal position, erate the contact for circuit opening free of the
handle 42 is moved-to the right to move pawl 32 handle and even if the latter be held, the holding
down, lug 44 pressing against shoulder 45 of pawl means for the mechanism being separate and in
32, until end 35 latches under projection 34; on‘ dependent of the rigid but releasable means for 75
‘ 3.
' 2,108,580
connecting the mechanism and the handle and
also being remote irom'such rigid and releasable
means.
‘
'
.
3. In a circuit controller, a contact, quick act
the handle does not open the circuit through the
mechanism but complete movement of the handle
does open‘ the circuit through the mechanism,‘
overload release of the holding means automat
ically and considerably increasing such lost mo
ing circuit opening and closing mechanism posi
tively connected thereto and so constructed as , tion so that circuit opening through movement
10'
15
to have a normal tendency to move the. contact
and thus open the circuit when permitted so to
do, holding means for the mechanism and ‘ar
ranged to release it on overload ‘and permit it to
operate for circuit opening, a l‘andle for operat
ing the mechanism for circuit opening or closing
even when the mechanism is held by the holding
means, the handle and the mechanism being
normally positively-connected through rigid but
releasable connecting means so that complete
movement of the handle necessarily causes cir
cuit opening movement of the mechanism, over
load release of the holding means automatically
20 releasing such releasable connection ‘so that cir
cuit opening movement of the mechanism respon
sive to overload release can take place free of the
handle, the holding means for the mechanism
being separate and independent of the rigid but
releasable means for connecting the mechanism
and the handle and also being remote from such
rigid and releasable means.
4. In a circuit controller, a contact, quick act
“' ing circuit opening and closing mechanism posi~
30 tively connected thereto and so constructed as
to have a normal tendency to move the contact
of the mechanism responsive to overload release -‘
can take place even though the handle be held.
6. In a circuitcontroller, a contact, quick act- ‘
ing circuit opening and closing mechanism posi
tively connected thereto and so constructed as It10 ' 7
to have a normal tendency to move the contact
and thus open the circuit when permitted so .to
do, holding means for the mechanism and ar
ranged to release it on overload and Permit it to. 15
operate for circuit opening, a handle for operat
ing the mechanism for circuit opening or closing
even when the mechanism is'held by the holding
means, the handle and the mechanism being nor
mally positively connected through rigid but re 20
leasable connecting means so that complete move
ment of the handle necessarily causes circuit
opening movement of the mechanism,‘ overload
release- of the holding means automatically caus
ing the mechanism itself to operate for releasing 25
such releasable connection so that circuit opening
movement of the mechanism responsive to over
load release can take place free of the handle, the
handle and the mechanism being‘ normally posi
tively connected through rigid lost motion means 30
so that partial movement of the handle does not
and thus open the circuit when permitted so to , open the circuit through the mechanism but com- ‘
do, holding means for the mechanism and ar
ranged to release it on overload and permit it
to operate for circuit opening, a'handle for op‘erl
ating the mechanism for circuit. openingor clos
plete movement of the handle does open the cir
cuit through the mechanism, overload release of
the holding means acting through the mechanism 35
itself for automatically and considerably increas
ing even when the mechanism is held by the hold
ing means, the handle and the mechanism being
through movement of the mechanism responsive _
normally positively connected through rigid but
40
ing such lost motion so that circuit opening
to overload release can take place even though
releasable connecting means so that complete
movement of the handle necessarily causes circuit
the handle be held.
opening movement of the mechanism, overload
mechanism, an overload-release latch for said
mechanism and arranged to hold said mechanism
release of the holding means automatically caus
ing the mechanism itself to operate for releas
ing such releasable connection ‘so that circuit
opening movement of the mechanism respon
.
40
'7. In a circuit breaker, a handle, an operating
normally and to move in response to circuit con
ditions to free and release said mechanism, the 45
latter being constructed to have an inherent
sive to overload release can take place free of . tendency ‘ to move out of latch-held position,
the handle, the holding means for the mecha
which movement is ‘inhibited normally by, the
nism being separate and independent of the rigid
holding thereof by the overload release latch,
but releasable means for connecting the mecha
hism and the handle and also being remote from
such rigid and releasable means.
5. In a circuit controller, a contact, quick act
means operatively connecting said mechanism to
said handle, ‘such means comprising a releasable
ing circuit opening and closing mechanism posi
55
tively. connected thereto and so constructed as to
have a normal tendency to move the contact and
thus open the circuit when,permitted so to do,
holding means for the mechanism and arranged
to release it on overload and permit it to operate 4
for circuit opening, a handle (for operating the
mechanism for circuit opening or closing even
latch, separate and independent, of the overload
release latch, and arranged to normally latch
the mechanism to the handle and to‘be released
so as to release the handlefrom the mechanism. 55
in response to a movement'o'f the mechanism, in
turn responsive to a release of the mechanism by -'
overload release movement of the overload re
lease latch, whereby the mechanism can move
free of the handle after the mechanism ‘has
caused the handle latch to be released.
8. A construction of the character of claim 5
wherein the holding means for the mechanism is
separate and independent of the rigid but re
leasable connecting means so that complete leasable means for connecting the mechanism 5%
05
movement of the handle necessarily causes cir
and the handle and alsois remote from such rigid
when the mechanism is held by the holding
means, the handle and the mechanism being nor
mally positively connected through rigid but re
cuit opening movement of the mechanism, over- *‘ and releasable means.
load release of the holding means automatically
‘ “releasing such releasable connection so that cir
cuit opening movement of the mechanism re
9. A construction of the character of claim 6
wherein the holding means for the mechanism is
separate and independent of the rigid but re-, 70
sponsive to overload release can take place free
of the handle, the handle and the mechanism be
leasable means for connecting the mechanism
and the handle and also is remote from such rigid -'
ing normally positively connected through rigid
‘and releasable means.
“lost motion means so that partial movement of"
.
-
ALFRED J. THOMSON.
‘
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