Electricity: circuit makers and breakers – Contact moved by sudden release of stored energy
Reexamination Certificate
2000-02-14
2001-11-13
Friedhofer, Michael (Department: 2832)
Electricity: circuit makers and breakers
Contact moved by sudden release of stored energy,
C200S501000
Reexamination Certificate
active
06316739
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for controlling a breaker, which is used in, for example, a transforming station and a switchyard.
DISCUSSION OF BACKGROUND
A device for controlling a breaker is practically activated by a spring. A conventional technique is disclosed in, for example, Japanese Examined Patent Publication JP-B-63-304542.
FIG. 10
illustrates a perspective view of a structure of the conventional device for controlling a breaker.
FIGS. 11 through 13
are plan views illustrating the structure of the device for controlling the breaker viewed from a front side of FIG.
10
. In
FIGS. 10 through 13
, numerical reference
1
designates a casing; numerical reference
24
designates a cylinder fixed to the casing; numerical references
26
,
27
designate rotatable levers, which are engaged with pins (not shown) provided on an end surface of the cylinder; numerical references
28
,
29
designates torsion bars, one ends of which are respectively fixed to the casing
1
and the other ends are respectively fixed to the levers
26
,
27
; and numerical references
34
,
35
designates torsion bars, one ends of which are respectively fixed to rotation shafts
32
,
33
and the other ends of which are respectively fixed to the levers
26
,
27
.
Numerical reference
37
designates a making lever fixed to the rotation shaft
33
. The making lever
37
is applied with a turning force in an anticlockwise direction in
FIG. 11
by the torsion bars
29
,
35
. Numerical reference
2
designates a cam shaft supported by the casing
1
. Numerical reference
3
designates a cam provided in the cam shaft
2
. Numerical reference
13
10
designates a pin B provided in the cam. Numerical reference
14
designates a making latch engaged with the pin B
13
. Numerical reference
15
designates a making trigger, which is engaged with the making latch
14
. Numerical reference
16
designates an electromagnetic coil having a plunger
17
.
Numerical reference
38
designates a rotation shaft supported by the casing
1
, which is driven in an anticlockwise direction in FIG.
11
. Numerical reference
39
designates a pinion fixed to the rotation shaft
38
. Numerical reference
40
designates a gear fixed to the cam shaft
2
and engaged with the pinion
39
, in which a part of teeth is omitted to disconnect an engagement with the pinion
39
when the torsion bars
29
,
35
are prestressed. Numerical reference
41
designates a link for connecting the making lever
37
to the gear
40
.
Numerical reference
36
designates a breaking lever fixed to the rotation shaft
32
, which is applied with an anticlockwise turning force by the torsion bars
28
,
34
. Numerical reference
8
designates a pin A provided in the breaking lever
36
, and numerical reference
9
designates a rotator provided in the breaking lever
36
. Numerical reference
18
designates a releasing latch, which is engaged with the pin A
8
and applied with a clockwise turning force by the spring
43
. Numerical reference
19
designates a releasing trigger engaged with the releasing latch
18
. Numerical reference
20
designates a releasing electromagnetic coil having a plunger
21
. Numerical reference
22
designates a movable contact of the breaker, which movable contact is connected with the breaking lever
36
through a linkage mechanism
23
. Numerical reference
42
designates a buffer connected to the breaking lever
36
, which relaxes an impact at a time of opening and closing the movable contact
22
.
In the next, an operation of opening a circuit will be described. In
FIG. 11
, the breaking lever
36
is constantly applied with anticlockwise turning force by the torsion bars
28
,
34
. The turning force is retained by the releasing latch
18
and the releasing trigger
19
.
When the releasing electromagnet
20
is excited under this state, the plunger
21
is rightward operated; the releasing trigger
19
clockwise rotates; and the releasing latch
18
is counterclockwise rotated by counterforce from the pin A
8
. When the releasing latch
18
is released from the pin A
8
, the breaking lever
36
counterclockwise rotates; and the movable contact
22
moves in a direction of opening a circuit.
FIG. 12
illustrates a state that the operation of opening the circuit is completed.
An operation of closing the circuit will be described. In
FIG. 12
, the cam
3
is connected to the making lever
37
through the cam shaft
2
, the gear
40
, and the link
41
, wherein the cam
3
is applied with clockwise turning force by the torsion bars
29
,
35
. The turning force is retained by the making latch
14
and the making trigger
15
. When the making electromagnet
16
is excited under this state, the plunger
17
is rightward moved; the making trigger
15
clockwise rotates; and the making latch
14
counterclockwise rotates by counter force from the pin B
13
. Because the making latch
14
is released from the pin B
13
, and therefore the cam
3
clockwise rotates to push up the rotator
9
provided in the breaking lever
36
, the breaking lever
36
is driven while clockwise twisting the torsion bars
28
,
34
.
When the operation of closing the circuit is almost completed, the pin A
8
of the breaking lever
36
is in contact with a lower portion a of the releasing latch
18
to thereby counterclockwise rotate the releasing latch
18
a little. When the pin A
8
exceeds an edge b, the releasing latch
18
is again clockwise rotated by the spring
43
; the pin A
8
is in contact with a step c of the releasing latch
18
, whereby the releasing latch
18
is engaged with the pin A
8
.
Just thereafter, the releasing trigger
19
is counter clockwise rotated to engage with the releasing latch
18
. The rotating cam
3
holds the breaking lever
36
via the rotator
9
from a beginning of engagements between the releasing latch
18
and the pin A
8
and between the releasing trigger
19
and the releasing latch
18
to an ending of the engagements. Thereafter, the contact between the cam
3
and the rotator
9
is canceled.
FIG. 13
illustrates a state that the pin A
8
is retained by the releasing latch
18
after completing to close the circuit. As an inherent movement of a device for controlling a breaker, it is necessary to reopen a circuit just after closing the circuit.
Further, because the torsion bars
29
,
35
are released while prestressing the torsion bars
28
,
34
, a prestressing energy of the torsion bars
29
,
35
is larger than that of the torsion bars
28
,
34
.
A prestressing operation of the torsion bars
29
,
35
will be described. As illustrated in
FIG. 13
, just after completing to close the circuit, the torsion bars
29
,
35
are released. When a motor (not shown) counterclockwise rotates the pinion
39
, the gear
40
is clockwise rotated to prestress the torsion bars
29
,
35
through the link
41
, the making lever
37
, and the rotation shaft
33
. At a position where the link
41
exceeds a dead point, in which a direction of a tensile load of the link
41
is in agreement with a center of the cam shaft
2
, the cam shaft
2
is applied with clockwise turning force through the link
41
by torque of the torsion bars
29
,
35
. Simultaneously, since the part of the teeth of the gear
40
is omitted, the pinion
39
and the gear
40
are disengaged. Thereafter, the pin B
13
is engaged with the making latch
14
to retain the clockwise turning force of the gear
40
by the torsion bars
29
,
35
, whereby the prestressing operation is completed. Thus, the state illustrated in
FIG. 11
is regained.
However, in the conventional device for controlling the breaker, when the pin A
8
of the breaking lever
36
is engaged with the releasing latch
18
after completing to close the circuit, the releasing latch
18
clockwise rotates to cause a collision between the step c and the pin A
8
, the releasing latch
18
rebounds and returns to an engaged position by the spring
43
to be in contact with the pin A
8
. F
Nakajima Nobuya
Ohtsuka Kyouichi
Friedhofer Michael
Mitsubishi Denki & Kabushiki Kaisha
Sughrue Mion Zinn Macpeak & Seas, PLLC
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