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Патент USA US3098144

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July 16, 1963
H. A. HIDDE NIJLAND
3,098,134
DRIVING MECHANISMS FOR ELECTRIC CIRCUIT-BREAKERS
Filed July 3, 1961
AB
U
4/
INVENTOR
HENDRiK
BY
A. H1005
NIJLAND
f2 ‘.4 .4,
ATTORNEYS
United States Patent 0 ' ice
i
3,098,134
ClRCUIT-BREAKERS
3,098,134
Patented July 16, 1963
a driving mechanism according to the invention in three
different operational positions.
In the drawing:
FIG. 1 is a diagrammatical view of said driving mech
anism in the position, in which the switching-on spring
Hendrik A. Hidde Niiland, Laren, Netherlands, assignor
and the switching-off spring are released and the circuit
to N.V. “COQ,” Utrecht, Netherlands, a corporation
of the Netherlands
breaker is in its open position.
Filed July 3, 1961, Ser. No. 121,533
FIG. 2 is a corresponding view of said mechanism in
Claims priority, application Netherlands July 2, 1960
the position, in which both the switching-on spring and
2 Claims. (Cl. zen-7s)
10 the switching-off spring are both tensioned and the cir
cuit-breaker is still in its open position, and
The invention relates to a driving mechanism for an
FIG. 3 is a corresponding view of said mechanism in
electric 'circuibbreaker adapted to be closed and opened
the position, in which the switching-on spring is released,
with snap-action and comprising a movable part carrying
the switching-off spring is still tensioned and the circuit
one or more switching contacts, said movable part being
breaker is in its closed position.
connected to a movable intermediate member through at
‘In the drawing, 1 is a switching rod ‘adapted to be
least one switching-off spring and a locking device for
moved axially up and down and to cooperate with ?xed
keeping said spring in tensioned condition, said inter
switching contacts 2, 3, to which may be connected in a
mediate member being in its turn connected through at
way not shown the circuit to be closed ‘or opened by the
least one switching-on spring and a second locking de
circuit-breaker. The switching rod 1 is connected through
vice for keeping said latter spring in tensioned condition
an insulator 4 to the arm 5 of a bell-crank ‘5, 7 adapted
to a stationary part of the mechanism and being arranged
to
be angularly reciprocated about the axis 6. In the
for such movement against the force of the switching-on
off-position of the circuit-breaker shown in FIG. 1 the
and the switching-off springs as to bring all springs in
arm 7 rests against a stationary abutment 8. The arm 7
their tensioned conditions simultaneously, and unlocking
is connected by one or more tension springs 9 to the arm
25
means adapted to release the locking devices from their
10 of a two-armed lever 14}, 12 adapted to be angularly
locking positions to control the -circuit—-breaker, the un
reciprocated about a shaft 11 and resting in the position
locking means for the switching-off spring consisting of
shown in FIG. 1 with its arm 12 against a stationary
a spring-loaded movable unlocking member held in ten
abutment 13. The arm 12 is connected by one or more
sioned position by a pawl mounted for operation from
30 tension springs 14 to a stationary part 15 of the circuit- .
the outside.
breaker.
A driving mechanism of this kind has been disclosed
The two-armed lever 1t}, 12 constitutes an intermediate
in the U.S. speci?cation 2,784,270. In that driving mech
member adapted to be operated by an operating mech
anism a special device is provided which prevents that
anism. This mechanism consists of a hydraulic cylinder
after the tensioning of all springs the intermediate mem
16 provided with a piston which is connected with the
35
her is drawn back with a free movement towards its
arm
12. Through a liquid supply conduit 18 liquid may
starting position when the locking device of the switching
be forced into the left hand cylinder space and through
oif spring is released before the one of the switching-on
the conduit 19 liquid may be discharged from the right
spring.
hand
cylinder space. A by-pass, in which a closable
The invention has for its object to bring the unlocking
choke-valve 21 is provided, is designated by 20‘, so that
members in their tensioned positions in ‘a simple manner
the hydraulic cylinder 16 and the piston 17 may also be
and to make a premature unlocking of the locking de
DRIVING MECHANISMS FOR ELECTRIC
vice of the switching-off spring impossible. It consists in
that the unlocking member for the switching-off spring
is brought into the tensioned position during the release
used as a clamping device.
The arm 7 of the bell-crank 5, 7 is also coupled with
a locking bar 22 having 'a stop 23 adapted to cooperate
of said spring and is held in said position as long as said 45 with a stud 24- provided on the arm 10 of the intermediate
member Iii, 12.
spring is in its released condition, said unlocking member
being only made free to be operated when the switching
o? spring is in its tensioned condition and the circuit
breaker is in its closed position. Also the unlocking
In order to tension the springs ‘of the driving mech
anism, so that the circuit-breaker may be closed and
thereafter opened again the piston 17 is moved to the
right,
whereby the intermediate member 10, 12 is rotated
means for the switching-‘on spring may consist of a 50
counterclockwise and the springs 9 as well as the springs
spring-loaded movable unlocking member which is held
14 are tensioned (FIG. 2).
in the tensioned position by a pawl mounted for opera
Mounted on a stationary part of the circuit-breaker is
tion from the outside, said unlocking member being
avsecond locking bar 25 having a stop 26 adapted to co
brought into the tensioned position during the release of
said switching-on spring and held in said position as long 55 operate with a stud 27 provided on the arm 12 of the inter
mediate member lti, 12. The locking bar 25 holds the
as said spring is in its released condition and said un
intermediate member 1t}, 12 in the position, in which the
locking member being only made free to be operated
springs 9 as well as the springs :14 are tensioned (FIG.
when the switching-on spring is in its tensioned condition.
2). The locking bar 22 for the switching-off spring 9
In the last mentioned embodiment of the driving mech
may be released from its locking position by means of an
anism the unlocking member ‘for the switching-on spring
unlocking member 28 constituted as an arm mounted for
may be coupled with the intermediate member and the
unlocking member for the switching-off spring may be
angular reciprocation about an axis 29‘. This arm is
coupled with the movable part of the circuit breaker.
loaded by a spring 30 and connected to two other arms
Consequently, in accordance with the invention at least
‘31, 32. The arm 31 cooperates with its free end with
the unlocking member for the switching-off spring is
a pawl 33 adapted to be operated from the outside and
brought into its tensioned position by said spring itself
and provisions are made that as long as said spring is in
under certain circumstances to hold the unlocking arm 28
in the working position, in which the spring 601 is ten
its tensioned condition and the circuit-breaker has not
sioned. In the illustrated embodiment the pawl 33 is
yet been closed the operation of the pawl of the unlock
operated by means of a push-button 33a. A correspond
ing member does not make said member operative.
70 ing unlocking member and accessories are provided for
The invention will be explained with the aid of the
the locking bar 25 of the switching-on spring 14. This
accompanying drawing which illustrates diagrammatically
8,098,184
unlocking member and these accessories are designated by
34, 35, 36, 3'7, 38, 39, 40.
The arm 32 of the unlocking member 28 is coupled
through a system of rods 41, 42, 43 with the arm 7 of the
bell-crank 5, 7 by means of a catch 44 provided at the
‘free end of the rod 41. It appears from FIG. 1, that
when [the bell-crank 5, 7 rests against the abutment 8 in
the open position of the circuit-breaker, the unlocking
4
the circuit-breaker is closed (FIG. 3), the pushing of the
button ‘40 has no effect, since the unlocking member 34 is
then locked in its tensioned position by the catch 48.
Thus a faulty operation of the circuit-breaker by hand is
prevented. Another effect of the invention is that the
springs of the unlocking members are tensioned by the
main switching springs of the circuit-breaker.
It is observed that it is not necessary that the switching
arm 28 is held by the catch 44 in the position in which
on elements of the driving mechanism are constructed in
the spring 30 is tensioned. In that position the arm 31 10 [the illustrated manner, that means in the same way as the
is a little bit free from the pawl 33 which then is in its
switching-off elements of the driving mechanism. The
locking position.
elements of the driving mechanism for the switching-on
In like manner the unlocking arm 34 for the switching
or closing process may also be constructed in the manner
on spring 14 is coupled with the arm 12 of the interme
as disclosed in the U8. speci?cation 2,784,270.
diate member 10, 12 by means of a system of rods 45, 15
What I claim is:
46, 47 provided with a catch 48 engaging the arm 38.
1. A ‘driving mechanism for an electric circuit-breaker,
If the intermediate member rests against the abutment
comprising in combination a movable part, at least one
13 the unlocking arm 34 is in its working position, in
switching contact carried by said movable part, a movable
which the spring 36 is tensioned and said unlocking arm
intermediate member, at least one switching-off spring, a
is held in said position by the catch 48. In that case the 20 ?rst locking device for keeping said spring in tensioned
arm ‘37 is a little bit ‘free from the pawl 39 which then is
condition, said switching-off spring and said ?rst locking
in its locking position.
device connecting said movable part with said intermedi
If the circuit-breaker must be closed, ?rst the inter
ate member, at least one switching-on spring, a second
mediate member i10, 12 is brought by the piston 17 into
locking device for keeping the latter spring in tensioned
the position shown in FIG. 2, in which position the 25 condition, said switching-on spring and said second lock
springs 9 and 14 are tensioned. In that position the
ing device connecting said intermediate member with a
circuit-breaker is still in its open position and the bell
stationary part of the circuit-breaker, an operating mem
crank 5, 7 still rests against the abutment 8. The catch
ber acting on the intermediate member and adapted to
44‘ then holds the unlocking arm 28 in its tensioned posi
bring all springs in their tensioned condition and both
tion, but the catch 48 leaves the unlocking arm '34 free 30 locking devices in their locking positions simultaneously
to be operated. If the button 40 is pushed the pawl 39
by moving said intermediate member against the forces of
is withdrawn and the spring 36 will move the unlocking
all springs, a ?rst unlocking means and a second unlock
arm ‘34 with a powerful blow against the locking bar 25,
ing means for the release from their locking positions of
whereby the latter is lifted with its stop 26 from the stud
said ?rst and said second locking devices respectively,
27 and the circuit-breaker is closed by the switching-on
said ?rst unlocking means including a spring loaded mov
spring 14 through the intermediate member 10, 12 and
able unlocking member, a pawl holding said unlocking
the locking bar 22 which remains in the locking position.
member in a spring loaded working position until the
The driving mechanism will then assume the position
pawl ‘is released from outside the circuit breaker, and a
shown in FIG. 3. During the clock-wise rotation of the
lost motion coupling interconnecting said unlocking mem
intermediate member 10, ‘12 the unlocking arm 34 is re
ber and said movable part so to force and hold said un
turned by the catch '48 to the working position, in which
the spring 36 is tensioned. Consequently, the switching
on spring 14 tensions also the spring 36 of the unlocking
member. If the driving mechanism is in the position illus
trated in FIG. 3, in which position the circuit-breaker is
closed and the switching-on spring 14 is released but the
switching-off spring 9 is still tensioned, the catch 44 leaves
the unlocking arm 28 for the switching-off spring '9 free
for operation.
|If the closed circuit-breaker must be opened again the
button 33a must be pushed, whereby the pawl ‘33 is with
locking member to said working position when the mov
able part is moved to open the switching contact and to
prevent the release of said pawl from releasing said un
locking member from said working position, said lost
motion coupling freeing the unlocking member so that
it can be released by said pawl from said working posi
tion when said switching contact is closed.
2. A driving mechanism for a circuit breaker as claimed
in claim 1, comprising in addition a second spring-loaded
movable unlocking member, said second unlocking mem
ber forming a part of the said second unlocking means
for the switching-on spring, a second pawl adapted to hold
said second unlocking member in a tensioned working
position and to be operated from outside the circuit
breaker, and a second lost motion coupling interconnect
ing the second unlocking member and the movable in
drawn and the unlocking arm 28 is moved with a power
ful blow by the spring 30 against the locking bar 22, so
that the stop 23 thereof is lifted from the stud 24 and the
switching-off spring '9 is allowed to release. The latter
spring draws the bell-crank 5,7 carrying the switching
rod 1, 4 back to the starting position, in which said bell
crank rests against the abutment 8 and the circuit-breaker
is opened. Then the position shown in FIG. 1 is restored.
termediate member so as to force said second unlocking
member to its said working position when said inter
mediate member is moved to close said switching contact
During the releasing of the switching-01f spring 9, that
means during the opening stroke of the switching rod 1, 4,
the unlocking arm 28 is brought by the catch 44 in the
working position, in which the spring 30 is tensioned.
-It appears from FIGS. 2 and 3 that, when both springs
9, 14 are tensioned (FIG. 2), the pushing of the push~ 65
button 33a for the withdrawal of the pawl 33 of the un
locking arm 28 has no effect, since said unlocking arm is
then held in its tensioned position by the catch 44. If
or to open said contact when all springs are eased, said
second lost motion coupling freeing the second unlocking
member for release by the second pawl when the inter
mediate member is in its position in which all springs
are tensioned.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,784,270
70
Nijland ______________ __ Apr. 13, 1954
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