JPH0238356Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to circuit breakers, and in particular, when a closing spring-operated circuit breaker is in the closing prohibited state, the closing button does not operate even if the closing spring is charged. This prevents the circuit breaker from being released by the closing spring and prevents the circuit breaker from closing.

Conventional technology Conventionally, in closing spring-operated circuit breakers,
If the closing spring has stored energy, the closing operation can be freely performed even if the opening/closing mechanism is held in the closing prohibited state, so the closing operation is performed using the closing operator, and the stored energy of the closing spring is released. However, after the closing operation of the opening/closing mechanism, the opening/closing mechanism was immediately returned to the trip state, resulting in a dry firing operation, which resulted in damage to the opening/closing mechanism.

Purpose of the invention Therefore, the purpose of this invention is to eliminate the above-mentioned drawbacks of the conventional technology.When the circuit breaker is in the closing prohibited state, even if the closing spring is stored, the closing button cannot be operated. A circuit breaker is designed in which the movement of the opening/closing mechanism does not apply a large impact force to the operator via the closing button if the circuit breaker is not closed and the closing button is held in the closing position and trips during the closing operation. It is to provide.

Structure of the invention To summarize this invention, it is a closing spring operated type circuit breaker, which is located between a closing button and a closing release plate, and has a first position in which the closing release plate is moved in conjunction with the closing button. A second circuit breaker is provided interveningly in the circuit breaker and is not interlocked when the circuit breaker is closed.
Equipped with an opening/closing interlock link configured to be releasable to the position of The hook interlocking lever, which is rotated in response to the rotational operation of the hook link that is interlocked with the hook that is rotated after being disengaged from the hook, restrains the opening/closing interlock link in the second position, and is rotated by the operation of the closing button. This prevents the opening/closing mechanism from closing.

Embodiment of the invention In a circuit breaker according to an embodiment of the invention shown in FIG. 1, a fixed main contact 1 and a fixed arcing contact 2 are fixed to a fixed side terminal conductor 3 as a contactor device, and a movable main contact 4
and a movable arcing contact 5 are attached to a movable main contact rod 6 and a movable arcing contact rod 7 so as to be in contact with the fixed main contact 1 and the fixed arcing contact 2, respectively, and the movable contact rods 6 and 7 are connected to the movable contact by a movable contact shaft 8. The contact spring 10 is rotatably supported by a holder 9 and has one end attached to the movable contact rods 6 and 7 and the other end attached to the contact holder 9 to apply contact pressure. The movable contact holder 9 is rotatably supported on a movable contact support plate 12 by a movable contact holder shaft 11. A U-shaped flexible lead conductor 13 has one end connected to the movable contact rods 6, 7.
The other end is connected to the movable terminal conductor 14. The arc extinguishing device 15 includes a group of arc extinguishing grids 16 each having a V-shaped notch made of a well-known magnetic plate, and a cooling plate 19 on the discharge port 18 side. is housed and supported within an arc extinguishing chamber cover 20 made of a molded insulator.

A mold base 22 made of a molded insulator is attached to the left and right fixed frames 21, and the movable contact support plate 1 is attached to the mold base 22.
2, fixed side terminal conductor 3 and movable side terminal conductor 1
4 is mounted and supported so as to protrude outward from the back. An inter-electrode separator 23 made of a thin transparent insulator is provided to cover the contact device live parts of each pole from the front side toward the mold base 22, and between the mold base 22, the arc extinguishing chamber cover 20, and the electrode. Separator 23 and terminal conductors 3, 14
It is formed so as to surround the arc extinguishing chamber and the main circuit conductive part except for the operating rod 24.

As an opening/closing mechanism of the contactor device, one end of each pole operating rod 24 made of an insulator is integrally connected to the contact holder 9 via a connection adjustment bolt 25.
The end protruding from the opening of the pole separator 23 toward the front side is a connector lever 28 equipped with a cross bar 27 that connects each pole via a connector lever shaft 26.
and one end of each of the input links 29. The other end of the input link 29 is connected to one end of a trip link 31 via an input roller shaft 30, and the other end of the trip link 31 is connected to one end of a trip lever 33 via a trip link shaft 32. This trip lever 33 is rotatably supported by a trip lever shaft 34. Connector lever shaft 26 and fixed frame 21
The cutoff spring 36 installed between the spring mounting piece 5 provided in It acts to rotate. The closing link 29 and the trip link 31 form a pair of toggle link mechanisms, and the rotational force of the connector lever 28 acts to bend the closing link 29 and the trip link 31 into a dogleg shape.
Both links 29,3
1 in an extended closed state. The closing latch 38 is rotatably supported on the closing shaft 39 and is supported by a closing latch spring (not shown).
is biased clockwise by. The trip lever 33 is biased clockwise by a trip lever spring 40, and the other end 33a is releasably engaged with a foot roller 42 provided on a hook 41, and the hook 41 is rotatably supported on a hook shaft 43. A trigger pawl 46 is biased counterclockwise by a hook spring 44 and is provided on the outer peripheral edge 41a of the hook 41 and the rotation axis of the trigger lever 45.
is engaged with. Trip link 31 of the clockwise rotational force of the connector lever 28 by the cutoff spring 6
The force acting on the side is reduced and the trip lever 3
3. It is supported by a trigger pawl 46 via a hook 41, and together with the closing latch 38, holds the circuit breaker in a closed state.

The opening/closing indicator link 47 has one end connected to the connector lever 28 that moves when opened/closed, and the other end connected to the opening/closing indicator 48 .
9, the other end is rotatably supported on a release lever shaft 50, and an opening/closing interlock lever 51 and a release lever 52 are coaxially supported.
is pivoted. Open/close interlock lever 5
1 is provided with an opening/closing interlock interlocking pin 53 protruding from both sides, and a clockwise biasing force is applied so that one side of the interlocking pin 53 is always pressed against the lower edge of the opening/closing indicator 48.
An opening/closing interlock link 54 is supported on the other side. An opening/closing interlock pin 55 is attached to the bent portion of the lower end of the opening/closing interlock link 54, and the opening/closing interlock pin 55 is provided to correspond to a closing button 56 provided so as to be operable from the outside of the front cover 49. . One end of the input button 56 is rotatably attached to a handle shaft 57.

The input release claw 58 is rotatably supported so as to be able to engage and release one end of the release lever 52, and a input release plate 59 is integrally attached thereto. The other end of the release lever 52 freely engages and releases a holding roller 61 provided on a closing cam 60 which is integrally attached to the closing shaft 9 together with the closing latch 8, and when the closing spring described below is energized. One end of the release lever 52 engages with the input release pawl 58, and the other end engages with the holding roller 61 of the input cam 60, and the closing state is maintained by the engagement between the input roller 37 and the input latch 38. When the closing spring is not loaded, the closing roller 37 is also supported by the periphery of the closing cam 60 and the closing state is maintained. The trigger interlocking lever 62 is rotatably attached integrally to the interlocking lever shaft 63, and is provided with a trigger interlocking lever pin 64, which is connected to a long hole 66 provided at one end of the trigger link 65.
is loosely connected. The other end of the trigger link 65 is connected to one end of the trigger lever 45. The trigger spring 67 is installed between one end of the trigger link 65 and the mechanism frame 68, and the trigger link spring 69 is installed between the trigger link 65 and the trigger interlocking lever 62. The hook interlocking lever 70 is provided so that the opening/closing interlock pin 55 is pushed down and the closing button 56 is idle except when the circuit breaker is ready to close. It is freely supported and loosely connected to a long hole 73 provided at one end of a hook link 72 by a hook link pin 71. The other end of the hook link 72 is connected to the hook 41 by a hook link shaft 74. A closing spring guide shaft is installed between a pair of mechanism frames 68, 68' that support the opening/closing mechanism members with a gap between them, and is inserted through the guide elongated hole 68a of the mechanism frames 68, 68' and protrudes from both sides. 75 and a closing crankshaft 77 of a closing crank 76, which is integrally pivotally connected to the closing shaft 39 that protrudes on both sides of the mechanism frames 68, 68', as shown in FIGS. 2 and 3. will be erected. A closing spring guide 79 is provided to pass through the coil of the closing spring 78.

In the closed circuit state shown in FIG. 1, when a manual or electrical trip command is given, the interlocking lever shaft 63 is rotated, and the trigger interlocking lever 62 is rotated counterclockwise via the interlocking lever shaft 63. , the trigger lever 45 connected to the trigger link 65 is rotated clockwise, the trigger pawl 46 and the hook 41 are disengaged, the hook 41 is rotated clockwise, and the foot crawler 42 and trip lever 33 are rotated clockwise. The engagement is disengaged, the trip link 31 and the closing link 29 are pulled down, the connector lever 28 rotates clockwise, and the opening/closing mechanism collapses into the state shown in FIG. 4, and the movable contacts 4, 5
is in an open state where it is separated from the fixed side contacts 1 and 2. In FIG. 4, the closing spring 78 is in the released state, and the closing roller 37 moves along the outer periphery of the closing cam 60 and is free to trip.

When the tripping command is cut off from the tripping state shown in FIG. 4, the trigger interlocking lever 62 and the trigger lever 45
A return force to the original state is applied by a trigger spring 67 provided on the trigger link 65. At this time, the closing crank 76 is rotated counterclockwise by manual or electric operation, and the closing spring 7
8 is charged, the input cam 60 interlocks with this.
rotates counterclockwise, and the peripheral recess 60a of the charging cam 60 faces the charging roller 7 as shown in FIG. The trip lever 33 falls into the recess 60a of the input cam 60, rotates counterclockwise, disengages from the outer periphery on which the foot roller 42 slides, and engages with the one end 33a. Next, the hook 41 is rotated counterclockwise by the hook spring 44, and the trigger lever 45 is also rotated by the trigger spring 44.
7 in the counterclockwise direction, and enters the reset state shown in FIG. When the closing spring 78 is in the released state in the tripping state shown in FIG. 9, the trip lever 33 and the hook 41 are restrained and cannot be reset.

As shown in FIG. 5, when the closing spring 78 is in the reset state with stored energy, the acting force of the closing spring 78 is applied to the closing crankshaft 7 via the closing spring guide 79.
7 to rotate the closing crank 76 counterclockwise, and the closing crank 76 is connected to the closing cam 60 via the closing shaft 39.
The closing cam 60 attempts to rotate counterclockwise. This input cam 60 is the holding roller 6
1, and the holding roller 61 is connected to the release lever 52.
, a counterclockwise acting force is applied to the release lever 52, and this acting force is applied to the closing release claw 5.
It is held by 8.

When closing the circuit breaker from the above-mentioned reset state, when the closing button 56 is pressed, it rotates clockwise about the handle shaft 57 and presses the closing release plate 59 via the opening/closing interlock pin 55 to release the closing button. The pawl 58 rotates counterclockwise, disengaging from the release lever 52, and the release lever 52 rotates counterclockwise, causing the closing cam 6 to disengage.
0 loses support from the holding roller 61 and closes the closing spring 7.
8, the outer periphery of the input cam 60 pushes up the input roller 37, stretches the bends of the input link 29 and the trip link 31, and the input link 29 pushes the connector lever 28.
The operating rod 24 rotates the cross bar 27 counterclockwise and is connected to the connector lever 28 of each pole.
Press , rotate the movable contact holder 9 clockwise, and press the movable contacts 4 and 5 against the fixed contacts 1 and 2. At approximately the final stroke of the charging, the outer periphery of the charging cam 60 becomes substantially arc-shaped around the charging shaft 39, and the charging is completed. During the closing operation, the closing roller 37 pushes the closing latch 38 counterclockwise, but as soon as closing is completed, the closing roller 37 no longer acts, and the closing latch 38 is returned to its original state by a closing latch spring (not shown). One end 38a of the arm of the return input latch 38 and the input roller 37 are in a state facing each other. Closing spring 7
The acting force 8 causes the closing crank 76 to rotate counterclockwise from the state shown in FIG. 2, and at the position shown in FIG. 3, where the closing crankshaft 77 has rotated approximately 180 degrees around the closing shaft 39, it becomes weakest and stops. As a result, the closed circuit state shown in FIG. 1 is achieved. When the closing spring 78 is loaded in the closing state, the closing cam 60 rotates counterclockwise, and the concave portion 60a of the closing cam 60 contacts the closing roller 37.
The input roller 37 is held in the input state supported by the input latch 38.

6 to 8 show the energy storage mechanism of the closing spring 78, and the energy storage operation of the closing spring 78 is performed by both electric operation and manual operation.

6 to 8, a gear 80 and a charging lever 81 are pivotally connected to the charging shaft 39 between the outside of the mechanism frame 68' on one side and the charging crank 76. A fixed pawl 82 and a feed pawl 83 are provided to engage with the teeth of the gear 80, respectively. The fixing claw 82 has one end attached to a screw 98.
is fixed to the mechanism frame 68', the other end is rotatably supported by a shaft 85 on a fixed pawl support plate 84 supported by the input shaft 39, and biased counterclockwise by a fixed pawl spring 86. The feed claw 83 is connected to the charging lever 81 by the shaft 87.
It is rotatably supported by a shaft and biased counterclockwise by a feed pawl spring 88. Charging lever 81
One end is loosely connected to a long hole 91 at one end of a charging link 90 by a charging lever pin 89, and a charging lever spring 92 is installed between the charging lever pin 89 and the mechanism frame 68'.

Further, the other end of the charging link 90 is connected to the manual charging handle 9. The manual charging handle 93 is provided so as to be operated from the outside of the front cover 49, and is rotatably supported by a handle shaft 57 provided at the lower end. A crank pin 9 is attached to the other end of a motor crank 95, one end of which is fixed to a rotating shaft 94 of the motor so as to correspond to the other end of the charging lever 81.
A charging roller 97 is attached by 6.

When the closing spring 78 is in the released state as shown in FIG. 3, the closing cam 60 is in the state shown in FIGS. 1 and 4, and the closing spring energy storage mechanism is shown in the state shown in FIG. 6. . In the case of manual operation, the manual charging handle 93 is pulled down to the front side of the front cover 49 and rotated counterclockwise to pull the charging link 90, and the charging lever pin 89 is engaged with the elongated hole 91. When the charging lever 81 is rotated counterclockwise, the gear 80 is engaged with the feed pawl 83 attached to the charging lever 81, so the gear 80 rotates counterclockwise and is connected to the charging shaft 39. The closing crank 76 rotates together to compress the closing spring 78, and the closing spring 78 prevents reverse rotation by supporting the gear 80 tooth by tooth by the fixed pawl 82. When the manual charging handle 93 is rotated to the stop position as shown in FIG. 8, the gear 80 is advanced several teeth counterclockwise and is held by the fixed pawl 82. By returning the manual charging handle 93 to its original position and repeating the same operation, the gear 80 is further sent counterclockwise, compressing the closing spring 78 and storing energy, so that the gear 80 always remains clockwise during the operation process. Although a force to rotate the closing spring 78 is applied to the closing spring 78 and is supported by the fixed claw 82, the closing spring 78 is compressed to the maximum and the line of action of the closing spring 78 is directed toward the closing spring guide shaft 7.
5 and the closing shaft 39 crosses over to the opposite side, the force acting on the closing crank 76 of the closing spring 78 is reversed and acts counterclockwise, causing the fixing claw 82 to
This rotational force is transferred to input cam 6.
It is supported by the closing release pawl 58 via the holding roller 61 provided at 0 and the release lever 52, and is held in the closing spring energized state in which closing is expected as shown in FIG.

In the case of electric operation, the charging roller 97 is driven by the motor through a motor crank 95 whose one end is fixed to the rotating shaft 94 of the motor.
As the charging lever 81 rotates, one end edge of the charging lever 81 is pressed and rotated as shown in FIGS. 6 and 7 with each rotation. By pressing and rotating the charging lever 81, a feed pawl 83 attached to the charging lever 81 feeds the gear 80 counterclockwise to one tooth, and the gear 80 is supported by the fixed pawl 82. By repeating this operation, the closing spring 78 is
is compressed and stored, and immediately after the closing spring 78 is compressed to the maximum and the direction of the force acting on the closing crank 76 is reversed, about two teeth of the gear 80 corresponding to the feed pawl 8 are removed. The charging lever 81 and the motor crank 95 idle, and the gear 80
The power of the motor is turned off, and the operating force of the closing spring 78 is applied via the closing cam 60, and the stored energy state is maintained where it is finally supported by the closing release claw 58.

10 and 11 show the relationship between a trip button 110 for opening a circuit breaker that has been closed by manual operation, and as shown in FIG.
Manual charging handle 93, input button 5
The inner end protrusion 110 of the trip button 110 is rotatably supported along with the trip button 6, as shown in FIG.
A is provided to correspond to a trip link pin 111 that is integrally attached to the link lever shaft 63, and when the trip button 110 is pressed against the trip button return spring 112, it rotates clockwise about the handle shaft 57 as a fulcrum. Then, the inner end protrusion 110a presses the trip link pin 111, rotates the link lever shaft 63 and the trigger link lever 62 counterclockwise, and connects the trigger lever 45 to the trigger link 65 via the trigger link lever pin 64. By rotating it clockwise, the trigger pawl 46 and the hook 41 are disengaged, and the circuit breaker enters the trip state shown in FIG. 4.

In addition, all tripping means such as an overcurrent tripping device, a low voltage tripping device, or a voltage tripping device for opening a circuit breaker are connected to the interlocking lever shaft 6.
3 in a counterclockwise direction.

Effects of the Invention The closing operation and blocking of closing of the circuit breaker constructed as described above using the closing button 56 will be explained with reference to FIGS. 12 to 15.

In the state shown in FIG. 5 in which the circuit breaker is in an open state, the opening/closing mechanism is in a reset state in which the trigger claw 46 and the hook claw 41a of the hook 41 are engaged, and the closing spring 78 is charged, A holding roller 61 provided on the input cam 60 is engaged with one end of a release lever 52 rotatably supported on a release lever shaft 50, and the other end of the release lever 52 is engaged with an input release claw 58. As shown in FIG. 13, the connector lever 28 of the opening/closing mechanism that moves when the circuit breaker is opened/closed is in the open position, and the opening/closing indicator link 47 is attached to the connector lever 28.
The opening/closing indicator 48 connected through the opening/closing indicator 48 is rotated clockwise about the release lever shaft 50 as a fulcrum, and the display portion 28a is located at a position corresponding to the display window 49a.

The opening/closing interlock lever 51 has one end rotatably supported by the release lever shaft 50, has an opening/closing interlock interlocking pin 53 attached thereto, and is integrally interlocked with the movement of the opening/closing mechanism via the opening/closing interlock interlocking pin 53. The opening/closing indicator is operated by an opening/closing indicator spring 99 which is rotated in one direction in conjunction with the movement of the opening/closing indicator 48 in the closing direction, and has one end connected to the opening/closing indicator 48 and the other end connected to the opening/closing interlock lever in the opening direction. It is biased so as to press against the lower side of 48. One end of the opening/closing interlock lever 51 is rotatably held by the opening/closing interlock interlocking pin 53, and the opening/closing interlock lever 51 is held so that the opening/closing interlock pin 55 at the other end is in a position that operatively corresponds to the input button 56. A link 54 is provided, and an opening/closing interlock spring 102 installed between the opening/closing interlock lever 51 and the opening/closing interlock link 54 applies a biasing force in the clockwise direction so as to correspond to the closing button 56. The input release plate 59 is integrally attached to the input release claw 58 and is connected to the input button 5.
6 and is extended to correspond to the input release plate 59.
The opening/closing interlock pin 55 of the opening/closing interlock link 54 is set to be interlocked between the opening/closing interlock link 54 and the input button 56, and as shown in FIGS. In the reset state of the opening/closing mechanism in which the claw 41a of 41 is engaged, the lower end arm 70 of the hook interlocking lever 70
a engages with the extension of the trigger interlocking lever pin 64, but the free end arm 70b is set upwardly so as not to restrain the opening/closing interlock pin 55. In this state, by pressing and rotating the input button 56 using the handle shaft 57 as a fulcrum, the input release plate 59 is rotated via the opening/closing interlock pin 55, the input release pawl 58 is rotated counterclockwise, and the release lever is rotated. 52, the release lever 52 and the holding roller 61 of the closing cam 60 are disengaged, and the stored force of the closing spring 78 is released to close the circuit breaker.

Next, when the circuit breaker is in the closed state and the closing spring 78 is in a state where the closing spring 78 is kept in a state in which the closing spring 78 is stored, the opening/closing mechanism is moved to the closing position as shown in FIG. Press 53 to open/close interlock lever 5
1 is rotated counterclockwise around the release lever shaft 50 as a fulcrum, and the opening/closing interlock link 54 held by this moves downward, and the opening/closing interlock pin 55 provided at the lower end moves toward the closing release plate 59. The release plate 59 does not operate even if the release button 56 is pressed in the release direction, and the release spring 78 cannot be released. This prevents the closing spring 78 from being released unnecessarily.

Furthermore, when the circuit breaker is in a closed state and a trip signal is input from the trip button 110, overcurrent tripping device, low voltage tripping device, voltage tripping device, etc., the interlocking lever shaft 63 rotates counterclockwise. The trigger interlocking lever 62 connected thereto is rotated counterclockwise together, and the trigger lever 45 connected to the trigger link 65 is rotated clockwise via the trigger interlocking lever pin 64, so that the trigger pawl 46 and the hook pawl 41a are rotated. is disengaged, the hook 41 is rotated clockwise, the opening/closing mechanism collapses, and the circuit breaker enters a trip state in which it is opened. In this trip state, the open/close indicator 48 is rotated clockwise by the open/close mechanism.
The opening/closing interlock lever 51 receives a rotational bias force in the clockwise direction by the opening/closing indicator spring 99.
Although it acts to pull up the opening/closing interlock link 54 and the opening/closing interlock pin 55,
The extension of the trigger interlocking lever pin 64 rotates the lower end arm 70a of the hook interlocking lever 70 in a counterclockwise direction, and the free end arm 70b presses the opening/closing interlock pin 55 downward to release the input button 56 and the input release plate. 59, and even if the closing button 56 is operated to close, the stored force of the closing spring 78 cannot be released and the circuit breaker cannot be closed.

It should be noted that the holding force at the trip operating position due to the rotation of the interlocking lever shaft 63 by the trip means for restraining the opening/closing interlock pin 55 by the hook interlocking lever 70 by the operation of the trigger interlocking lever pin 64 is determined by the operator using the trip button 110, for example. There are disadvantages in that the operating force fluctuates and becomes unstable, and the stroke of the trigger interlocking lever pin 64 that rotates the hook interlocking lever 70 is short, so to compensate for this, the operation of the hook interlocking lever 70 is more reliably stabilized. In order to do this, the hook link 72 is pushed up in conjunction with the hook 41 which is rotated clockwise by the trip, and the hook link lever 70 is rotated counterclockwise via the hook link pin 71, and the opening/closing interlock pin 55 is moved to the closing button. 5
An acting force is applied to restrain the position between the input release plate 56 and the input release plate 56 away from the corresponding interlocking position.

Effects of the invention As described above, this invention interposes the end of the opening/closing interlock link 54 at a corresponding interlocking position between the input button 56 and the input release plate 59, and allows the end of the opening/closing interlock link 54 to be tripped. When the circuit breaker is tripped, it is restrained in a position deviated from the corresponding interlocking position between the closing button 56 and the closing release plate 59 by a trip connecting member that is connected to an interlocking lever shaft 63 that rotates in response to a command. Therefore, when a trip command is input and while the opening/closing mechanism is not reset, the stored force of the closing spring 78 is not released by the closing operation of the closing button 56, and unnecessary operation of the circuit breaker is performed. The closing operation is blocked.

[Brief explanation of the drawing]

Fig. 1 is a side view in central section of a circuit breaker showing an embodiment of this invention in the closed state, Fig. 2 is a side view showing the closing spring in the charged state, and Fig. 3 shows the releasing state of the closing spring. A side view, FIG. 4 is a partially sectional side view at the center showing the tripped state, FIG. 5 is a partially sectional side view from the center showing the reset (open circuit) state, and FIGS. 6 to 8 show the closing spring storage mechanism. These are side views, and FIG. 6 shows a state in which energy storage is started by electric operation, FIG. 7 shows a state in which the charging lever is driven by electric operation, and FIG. 8 shows a state in which the charging lever is driven by manual operation. 9 is an exploded perspective view of a main part of the closing spring energy storage mechanism, FIG. 10 is a perspective view showing a manual operating instrument pivotally supported on the handle shaft, and FIG. 11 is an explanatory diagram of the operation of the trip button.
FIGS. 12 and 15 are perspective views of the main parts of this invention, and FIGS. 13 and 14 are explanatory diagrams of the operation of the main parts. In the figure, 1... Fixed main contact, 2... Fixed arcing contact, 4... Movable main contact,
5... Movable arcing contact, 6... Movable main contact rod, 7... Movable arcing contact rod, 9... Movable contact holder, 10... Contact spring, 15... Arc extinguishing device, 16...
... Arc extinguishing grid, 19 ... Cooling plate, 20 ... Arc extinguishing chamber cover, 21 ... Fixed frame, 22 ... Mold base, 23 ... Interpolar separator, 24 ...
Operation rod, 27... Cross bar, 28... Connector lever, 29... Closing link, 31... Trip link, 33... Trip lever, 36...
Shutoff spring, 37... Closing roller, 38... Closing latch, 39... Closing shaft, 40... Trip lever spring, 41... Hook, 42... Foot roller, 43... Hook shaft, 45... Trigger Lever, 47... Open/close indicator link, 4
8... Open/close indicator, 49... Front cover, 50... Release lever shaft, 51... Open/close interlock lever, 52... Release lever, 54... Open/close interlock link, 56...
...Loading button, 57...Handle shaft, 58
...Input release claw, 59...Input release plate,
60... Input cam, 61... Holding roller, 62...
...Trigger interlocking lever, 65...Trigger link, 67, 69...Trigger spring, 70...
...Hook link lever, 72...Hook link, 7
6... Closing crank, 78... Closing spring, 80...
...Gear, 81...Charging lever, 82...
Fixed claw, 83...Feeding claw, 89...Charging lever pin, 90...Charging link, 93
...Manual charging handle, 95...Motor crank, 96...Crank pin, 97...Charging roller.

Claims (1)

[Scope of Utility Model Registration Claim] A closing spring having one end locked to a loading crank attached to a loading shaft, a holding roller provided to a loading cam attached to the loading shaft, and one end of the loading spring being attached to the holding roller. The release lever has an engaged release lever and a closing release pawl that is engaged with the other end of the release lever, and the closing release pawl and the release lever are disengaged by a closing operation of a closing button. In a circuit breaker in which the engagement between the release lever and the holding roller is released, the stored force of the closing spring is released, and the opening/closing mechanism is closed. A charging release plate 5 provided to correspond to the charging button 56
9, which is interposed between the closing button 56 and the closing release plate 59 and is interposed at a first position for moving the closing release plate 59 in conjunction with the closing button 56, The opening/closing interlock link 54 is configured to be removable to a second position in which it does not interlock when the circuit breaker is closed; the hook 41 and trigger pawl 46 lock the opening/closing mechanism when the circuit breaker is closed; and the trigger pawl is integrated. Trigger lever 45 that is attached to and rotates the trigger claw to release the trigger.
a trigger interlocking lever 62 that rotates in conjunction with the trigger lever 45 in response to a tripping command; a hook interlocking lever 70 that engages with and rotates the trigger interlocking lever; and a hook interlocking lever 70 that rotates in conjunction with the trigger lever 45; a hook link 72 connected to a hook interlocking lever; and when the trigger interlocking lever 62 rotates due to a tripping command being given in the closed state, the hook link 72 is connected to a hook interlocking lever, and when the trigger interlocking lever 62 rotates, the hook link 72 is connected to a hook interlocking lever. The hook interlocking lever 70, which is rotated in response to the rotational movement of the hook link 72 which is interlocked with the hook 41 which is rotated when the trigger claw 46 is disengaged, is connected to the opening/closing interlock link 54.
The circuit breaker is configured such that the opening/closing mechanism is prevented from being closed by operating the closing button 56 by being restrained in the second position.