Electricity: circuit makers and breakers – Contact moved by sudden release of stored energy
Reexamination Certificate
2000-04-04
2001-05-15
Friedhofer, Michael (Department: 2832)
Electricity: circuit makers and breakers
Contact moved by sudden release of stored energy,
C200S01700A, C218S154000
Reexamination Certificate
active
06232569
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for controlling a switch operated by a spring, for example, a breaker in a switching device for an electric power unit installed in a transforming station and a switchyard.
2. Discussion of Background
Generally, a spring is utilized as an origin of force for operating a control device of a breaker as a switch.
FIGS. 14 through 19
illustrate a conventional spring controlling device of a breaker disclosed in, Japanese Unexamined Patent Publication No. JP-A-63-304542, wherein
FIG. 14
is a perspective view, and
FIG. 15
illustrates a structure of an important portion of the controlling device.
FIG. 16
illustrates a state of the spring controlling device in a state that the conventional breaker is opened.
FIG. 17
illustrates a state of a torsion bar in a released state.
FIG. 18
is a front view of the conventional breaker.
FIG. 19
is a characteristic diagram illustrating a relationship between a displacement of a breaking control unit and a gas pressure in a cylinder in the conventional breaker.
In these figures, numerical reference
101
designates a casing; numerical reference
124
designates a cylinder fixed to the casing
101
; and numerical references
26
,
27
designate levers rotatably engaged with pins (not shown) located on an end surface of the casing
124
.
Numerical reference
28
designates a torsion bar for opening a circuit, one end of which is fixed to the casing
101
and the other end thereof is fixed to the lever
26
. Numerical reference
34
designates a torsion bar for opening the circuit, one end of which is fixed to the lever
26
and the other end thereof is fixed to a rotation shaft
32
. Numerical reference
29
designates a torsion bar for closing the circuit, one end of which is fixed to the casing
101
and the other end thereof is fixed to a lever
27
. Numerical reference
35
designates a torsion bar for closing the circuit, one end of which is fixed to the lever
27
and the other end thereof is fixed to a rotation shaft
33
.
The conventional device will be described mainly in reference of FIG.
15
. Numerical reference
37
designates a making lever fixed to the rotation shaft
33
, which rotation shaft
33
is fixed to an end of the torsion bar
35
to give a rotational force in the counterclockwise direction by the torsion bars
29
,
35
for closing the circuit as illustrated in FIG.
14
. Numerical reference
2
designates a cam shaft supported by the casing
101
; and numerical reference
3
designates a cam attached to the cam shaft
2
. Numerical reference
13
designates a pin provided in the cam
3
for engaging a making latch; numerical reference
14
designates a making latch engaged with the pin
13
for engaging the making latch
13
; and numerical reference
15
designates a making trigger engaged with the making latch
14
. Numerical reference
16
designates a making electromagnet having a plunger
17
.
Numerical reference
38
designates a rotation shaft supported by the casing
101
, which rotation shaft is driven in the counterclockwise direction in
FIG. 15
by a motor (not shown) Numerical reference
39
designates a pinion fixed to the rotating shaft
38
; and numerical reference
40
designates a gear fixed to the cam shaft
2
so as to be engaged with the pinion
39
, wherein teeth of the large gear are partially removed so as to be disengaged with the pinion
39
when the torsion bars
29
,
35
for closing the circuit illustrated in
FIG. 14
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
connected to an end of the torsion bar
34
for opening the circuit formed to receive a rotational force in the counterclockwise direction by the torsion bars
28
,
34
for opening the circuit illustrated in FIG.
14
. Numerical reference
8
designates a releasing latch engaging pin provided in the breaking lever
36
; and numerical reference
9
designates a roller provided in the breaking lever
36
. Numerical reference
18
designates a releasing latch engaged with the releasing latch engaging pin
8
.
Numerical reference
19
designates a releasing trigger engaged with the releasing latch
18
. Numerical reference
20
designates a releasing electromagnet having a plunger
21
. Numerical reference
22
designates a movable contact of the breaker, which contact is connected to the breaking lever
36
through a linkage mechanism
23
and a rod
61
. The movable contact
22
and the rod
61
of the breaker will be described in detail in a latter part of this paragraph in reference of FIG.
18
. Numerical reference
42
designates a buffer connected to the breaking lever
36
provided to relax an impact caused at a time of opening and closing the movable contact
22
.
An operation of opening the circuit will be described. The breaking lever-
36
is constantly applied with a rotational force in the counterclockwise direction in
FIG. 14
by the torsion bars
28
,
34
for opening the circuit, which rotational force is retained by the releasing latch
18
and the releasing trigger
19
. Under this state, when the releasing electromagnet
20
is excited, the plunger
21
is rightward moved to thereby release an engagement of the releasing latch
18
with the releasing trigger
19
by a clockwise rotation of the releasing trigger
19
.
When the engagement between the releasing trigger
19
and the releasing latch
18
is released, the releasing latch
18
rotates in the counterclockwise direction by a counterforce received from the releasing latch engaging pin
8
, whereby the releasing latch
18
is disengaged with the releasing latch engaging pin
8
. The breaking lever
36
rotates in the counterclockwise direction to resultantly move the movable contact
22
in the direction of opening the circuit through a linkage mechanism
23
connected to the breaking lever
36
.
FIG. 16
illustrates a state after completing this operation of opening the circuit.
In the next, an operation of closing the circuit will be described. In
FIG. 16
, the cam
3
is connected to the making lever
37
through the cam shaft
2
, the gear
40
fixed to the cam shaft
2
, and the link
41
, wherein the gear
40
and the cam
3
are applied with a rotational force in the clockwise direction by the torsion bars
29
,
35
for closing the circuit. This rotational force is retained by the making latch
14
and the making trigger
15
, which will be described in a latter part of this paragraph. Under this state illustrated in
FIG. 16
, when the making electromagnet
16
is excited, the plunger
17
is moved in the right direction; the making trigger
15
is rotated in the clockwise direction; and an engagement of the making latch
14
with the making trigger
15
is released.
When the engagement between the making trigger
15
and the making latch
14
is released, the making latch
14
rotates in the counterclockwise direction by a counterforce received from the making latch engaging pin
13
. Therefore, the cam
3
rotates in the clockwise direction by a releasing force of the torsion bars
29
,
35
for closing the circuit. Because an end portion of the cam
3
lifts the roller
9
located in the breaking lever
36
, the breaking lever
36
is moved in the clockwise direction, i.e. an arrow A in
FIG. 23
while twisting the torsion bars
28
,
34
for opening the circuit, whereby the torsion bars
28
,
34
for opening the circuit are prestressed.
When the breaking lever
36
is rotated to arrive a predetermined position, the releasing latch engaging pin
8
is engaged with and held by the releasing latch
18
. The operation of closing the circuit is completed under a state illustrated in FIG.
17
. As illustrated in
FIG. 17
, just after completing the operation of closing the circuit, the torsion bars
29
,
35
are released. Because the torsion bars
28
,
34
for opening the circuit are prestres
Nakajima Nobuya
Ohtsuka Kyoichi
Friedhofer Michael
Leydig , Voit & Mayer, Ltd.
Mitsubishi Denki & Kabushiki Kaisha
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