Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Contact-actuating means
Reexamination Certificate
2001-04-06
2002-02-19
Barrera, Ramon M. (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Contact-actuating means
C335S006000, C335S021000, C335S022000, C335S167000, C335S171000, C335S185000, C335S194000, C200S01700A
Reexamination Certificate
active
06348847
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a control device for a breaker.
Discussion of Background
In operating a breaker as a make break switch, a control device utilizing a spring force has been practiced.
FIGS. 25
to
31
show a conventional control device for a breaker disclosed in, for instance, JP-A-63-304542.
FIG. 25
is a perspective view showing the A construction of such control device for a breaker.
FIG. 26
is a diagram showing an important portion of the control device of the breaker, wherein the breaker is in a state of closing the circuit, and both opening and closing torsion bars are prestressed.
FIG. 27
is a diagram showing a making electromagnet and elements related to the making electromagnet.
FIG. 28
is a diagram showing the important portion of the control device of the breaker in a opening state, wherein the opening torsion bars are released and the closing torsion bars are prestressed.
FIG. 29
is a diagram showing the important portion of the control device of the breaker in a closing state, wherein the opening torsion bars are prestressed and the closing torsion bars are released.
FIG. 30
is a sequential diagram of a control circuit in the breaker, and
FIG. 31
is a diagram showing an operation chart of an auxiliary switch.
In these figures, numerical reference
1
designates a casing, numerical reference
24
designates a cylinder fixed to the casing
1
, and numerical references
26
and
27
designate levers fitted to pins (not shown) provided at an end face of the cylinder
24
so as to be capable of rotating. Numerical references
28
and
34
designate opening torsion bars, and numerical references
29
and
35
designate closing torsion bars. In order to prestress the opening torsion bars
28
and
34
by releasing the A closing torsion bars
29
and
35
, energy stored by the closing torsion bars
29
,
35
is made larger than energy stored by the opening torsion bars
28
,
34
. The opening torsion bar
28
has an end fixed to the casing
1
and the other end fixed to the lever
26
. The opening torsion bar
34
has an end fixed to a rotating shaft
32
and the other end fixed to the lever
26
.
The closing torsion bar
29
has an end fixed to the casing
1
and the ether end fixed to the lever
27
. The closing torsion bar
35
has an end fixed to a rotating shaft
33
and the other end fixed to the lever
27
. Numerical reference
37
designates a making lever fixed to the rotating shaft
33
, which is so constructed that a rotating force in a counterclockwise direction in
FIG. 26
is given by the closing torsion bars
29
,
35
. In this text, indications concerning a rotational direction, left and right directions and upper and lower directions are based on the surface of papers on which the figures are drawn unless specifically mentioned. Numerical reference
2
designates a camshaft supported by the casing
1
; numerical reference
3
a cam attached to the cam shaft
2
; numerical reference
13
a second pin formed in the cam
3
, and numerical reference
14
a making latch engaged with the second pin
13
. Numerical reference
15
designates a making trigger engaged with the making latch
14
, which is provided with a head portion
15
a
and a corner edge portion
15
b.
Numerical reference
16
designates a making electromagnet which has a making coil
16
a
and a plunger
16
b
as shown in detail in FIG.
27
. The plunger
16
b
comprises a body portion
16
c
and a trigger lever
16
d
connected rotatably to the body portion
16
c
by means of a pin
16
f
. The trigger lever
16
d
has a stepped portion
16
e
so as to be capable of engaging with the making trigger
15
. Numerical reference
17
designates a spring to urge the trigger lever
16
d
in a clockwise direction so that the trigger lever
16
d
is held in a horizontal state in contact with a stopper (not shown) formed in the body portion
16
c.
Numerical reference
21
designates a leaf spring attached to the casing
1
so as to oppose to the trigger lever
16
d
wherein an upper portion of the leaf spring is free with respect to the casing, and it is deformable elastically in left and right directions in FIG.
27
. The plunger
16
b
is driven in a right direction in
FIG. 27
when the making coil
16
a
is excited. When excitation to the making coil
16
a
is stopped, it is returned to the original position by the action of a return spring (not shown).
In
FIG. 26
, numerical reference
38
designates a Us rotating shaft supported by the casing
1
and is driven by a motor (not shown) in a counterclockwise direction. Numerical reference
39
designates a pinion fixed to the rotating shaft
38
and numerical reference
40
designates a gear which is fixed to the camshaft
2
to mesh with the pinion
39
and in which a part of the teeth is removed so that it disengages from the pinion
39
when the closing torsion bars
29
,
35
are prestressed. Numerical reference
41
designates a link connecting a making lever
37
with the gear
40
.
Numerical reference
36
designates a breaking lever fixed to the rotating shaft
32
and is so constructed as to receive a rotating force in a counterclockwise direction by the opening torsion bars
28
,
34
. Numerical references
8
and
9
designate respectively a first pin and a rotor attached to the breaking lever
36
. Numerical reference
18
designates a releasing latch which is engaged with the first pin
8
and receives a rotating force in a clockwise direction by a spring
43
.
Numerical reference
19
designates a releasing trigger engaged with the releasing latch
18
and numerical reference
20
designates a releasing electromagnet having a releasing coil
20
a
and a plunger
20
b
. The plunger
20
b
is driven in a right direction in
FIG. 26
by the excitation to the releasing coil
20
a
. When excitation to the releasing coil
20
a
is stopped, the plunger
20
b
is returned to the original position by the action of a return spring (not shown). Numerical reference
10
designates an on-off contact of the breaker, numerical reference
12
a stationary contact and numerical reference
22
a movable contact. The movable contact
22
is connected to the breaking lever
36
via a linkage mechanism
23
. Numerical reference
42
designates a buffer connected to the breaking lever
36
to relax an impact applied at the time of on-off operations of the movable contact
22
.
In the next, the operation of opening the circuit will be described. In
FIG. 26
, the breaking lever
36
is constantly applied with a rotating force in a counterclockwise direction by the opening torsion bars
28
,
34
, and the rotating force is retained by the releasing latch
18
and the releasing trigger
19
. When the releasing electromagnet
20
is excited in this state, the plunger
20
b
is moved in a right direction and the releasing trigger
19
is rotated in a clockwise direction whereby the releasing latch
18
is rotated in a counterclockwise direction by a counter force applied from the first pin
8
. When the releasing latch
18
is disengaged from the first pin
8
, the breaking lever
36
is rotated in a counterclockwise direction, and the movable contact
22
is driven in a direction of opening the circuit.
FIG. 28
shows a state that the operation of opening the circuit is completed.
An operation of closing the circuit is conducted as follows. In
FIG. 28
, the cam
3
is connected to the making lever
37
via the camshaft
2
, the gear
40
and the link
41
, wherein a rotating force in a clockwise direction is applied by the closing torsion bars
29
,
35
. The rotating force is retained by the making latch
14
and the making trigger
15
.
When the making electromagnet
16
is excited in this state, the body portion
16
c
of the plunger
16
b
and the trigger lever
16
d
connected thereto are moved in a right direction, and the making trigger
15
is rotated in a clockwise direction by a kicking motion thereof, whereby the making latch
14
is rotated in a counterclockwise direct
Nakajima Nobuya
Ohtsuka Kyouichi
LandOfFree
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