JP2001157330A - Shutter device of lead-out type circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shutter device of a low price and safety lead-out type circuit breaker. SOLUTION: The multi-pole frame side terminals (2) arranged in a line are covered with a narrow shutter plate (9) and a part of the lead frame corresponding to the intermediate part is provided with a rod (13) having a collar (13a) engaged with the shutter plate (9).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for securing safety of a shutter device of a multi-pole draw-out type circuit breaker.

[0002]

2. Description of the Related Art A drawer-type circuit breaker includes a drawer frame and a breaker body that moves in the drawer frame. When the breaker body is pulled out of the drawer frame, the frame side terminal and the body side terminal are separated and inserted. The contact is made by contact. The frame-side terminal penetrates through the inner wall of the drawer frame, an external wire is connected to an outer portion thereof, and the inner portion contacts the main body-side terminal.

The inside portion of the frame side terminal is exposed when the breaker body is pulled out, and there is a problem that an electric shock is caused if touched by mistake. Therefore, the drawer type circuit breaker automatically attaches this portion to an insulating plate. May be mounted. Japanese Patent Application No. 10-59961 proposes an example of a conventional technique of this shutter device by the present applicant.

In this conventional three-pole type draw-out type circuit breaker to which the shutter device is mounted, the input and output terminals of the three poles are vertically arranged in a horizontal line with an interval therebetween. The shutter device has a shutter device (insulating plate) on the upper and lower sides corresponding to the input side and the output side terminal, both ends of which are held by a driving device provided opposite to the left and right side plates of the drawer frame, When the circuit breaker main body is pulled out, each shutter plate covers the circuit breaker main body side end surface of the frame side terminal for three poles protruding inside the drawer frame in a state where there is almost no space between the shutter plate. The drive device operates following the insertion of the breaker body, and the respective shutter plates move upward or downward to expose the frame side terminals. The board also moves in the direction of insertion of the breaker body, and both terminals come into contact.

[0005]

In this conventional shutter device, since the shutter plate covers the end faces of the frame-side terminals for three poles in a lump and is held at both ends, the shutter plate is intentionally or unintentionally. When a force is applied so as to pull the center part forward, there is a danger that a finger or the like comes into contact with the frame-side terminal because the space between the shutter plate and the end surface of the frame-side terminal becomes large. In order to avoid such a danger, the conventional shutter device is designed so that a finger or the like does not touch the frame side terminal even if the shutter plate is thickened to reduce the amount of bending or the width in the vertical direction is slightly increased to bend slightly. I needed to. However, with such a configuration, it is necessary to use an expensive insulating plate or to strengthen the spring of the driving device, and there is a problem that the device becomes expensive.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to realize a safe drawer-type circuit breaker shutter device that can solve the above-mentioned problems with a simple configuration.

[0007]

In order to solve the above-mentioned problems, a shutter device for a draw-out type circuit breaker according to any one of claims 1 to 3 has a drawer frame having a frame side terminal and a drawer. A circuit breaker body having a main body side terminal that moves in the frame and contacts and disengages with the frame side terminal, and the input side and the output side terminal of each pole are arranged in a line in the width direction of the drawer frame. A drawer-type circuit breaker shutter device,
A vertically displaceable shutter plate separately provided on the input side and the output side covering the end surface of the circuit breaker body side of the frame side terminal, and the circuit breaker body is inserted or pulled out while holding both ends in the width direction of the shutter plate. And a drive mechanism for displacing the shutter plate so as to expose or cover the end faces of the frame-side terminals, respectively, to move to a position where the shutter plate can be engaged with the shutter plate when the breaker body is pulled out. A blocking member for preventing the shutter plate from bending in the direction in which the breaker body is pulled out,
The drawer frame is provided at the middle part in the width direction.

With such a configuration, even if a force is applied to the shutter plate in the direction of the circuit breaker body with the circuit breaker body pulled out, the shutter plate is engaged with the shutter plate bending prevention member at an intermediate portion thereof, Since the displacement is prevented at both ends in the width direction and at the middle part, no harmful gap is formed between the shutter plate and the end face of the terminal by bending at the middle part.

According to a fourth aspect of the present invention, there is provided a shutter device for a draw-out type circuit breaker according to the third aspect, wherein a lock hole is formed in a lever serving as a shutter plate bending prevention member, and the lever is biased in a direction opposite to the biasing direction of the lever. A lock lever that is urged in the direction and has a lock hole is provided coaxially with the lever. When the lock lever is rotated to a position where both lock holes overlap with the shutter plate closed, it engages with the shutter plate. The lock lever is provided with an engagement means that is capable of preventing the shutter plate from moving in the opening direction.

With this configuration, the lock lever is rotated in a closed state in which the shutter plate covers the end surface of the frame-side terminal, so that when the lock hole of the lever and the lock lever overlap, both holes are inserted. When a lock means such as a padlock is attached to the frame, even if the shutter plate is artificially pushed in the opening direction, the engagement means of the lock lever prevents the shutter plate from moving, so that the frame side terminal is not exposed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to first to third embodiments shown in FIGS. In the shutter device of the first embodiment, an input-side frame-side terminal 2 and an output-side frame-side terminal 3 having three poles arranged in a horizontal line are attached between side plates 1 provided on the left and right in FIG. A draw-out frame 5 provided with an insulating molded product 4 and a main-body-side terminal 6, which comes into contact with the upper and lower surfaces of the frame-side terminals 2, 3 in the inserted state shown in FIG. Circuit breaker body 8 provided with 7
And a three-pole drawer-type circuit breaker.

The shutter device includes shutter plates 9, 10 provided corresponding to the frame-side terminals 2, 3, shutter plate driving devices 11, 12 for holding the shutter plates 9, 10 at both left and right ends thereof, respectively. Rod 13, which will be described in detail later,
14 is provided. FIG. 2 shows a state in which the circuit breaker main body 8 is pulled out, and a state in which the shutter plate 9 covers the circuit breaker main body side end surface 2a of the frame side terminal 2 according to a predetermined function (shutter). (Closed state), but for convenience of description, the shutter plate 10 is displaced upward and the end face 3a of the frame side terminal 3 is exposed (the shutter is open) with respect to the frame side terminal 3. I have. Since these upper and lower shutter devices are symmetrical only in the vertical direction and have the same structure and operation, only the upper shutter device will be described below. Also, shutter plate driving devices 11 and 12
Is the same as that proposed in the prior art described above,
Since it is not a main part of the present application, a detailed description thereof will be omitted.

In this shutter device, when the circuit breaker main body 8 is pulled out, the entire portion of the inside of the draw-out frame of the frame-side terminal 2 is surrounded by an insulating material. The end surface 2a on the circuit breaker main body side is covered with a shutter plate 9 and is covered with a fixed cylinder 15 and a movable cylinder 16 made of an insulator provided on the side terminal 2.

First, a fixed cylinder 15 that covers the side surface and the upper and lower surfaces of the inner portion of the frame side terminal 2 is fixed to the frame side terminal 2 with screws.
The movable barrel 16 is fitted inside the fixed barrel 15 and is slidable. The movable barrel 16 is urged toward the breaker main body by a spring 17, and when the breaker main body 8 is pulled out, FIG.
The movable barrel 16 is displaced to the left as shown in FIG. 4 and covers the periphery of the frame side terminal 2 in cooperation with the fixed barrel 15. 6 is pushed rightward so that the periphery of the left half of the in-frame portion 2a is exposed as shown in FIG.

Next, when the circuit breaker body 8 is pulled out, the shutter plate 9 covering the end face 2a on the circuit breaker body side has a slight gap from the end face as shown in FIG.
In this state, no accident such as electric shock occurs. Then, during the insertion process of the circuit breaker body 8, the shutter plate driving device 11 operates, and as shown in FIG. 5, the shutter plate 9 moves downward in parallel to expose the end face 2a, and finally moves rightward, as shown in FIG. Reach the position.

In such a shutter plate 9, a substantially V-shaped notch 9a is formed between the right pole and the center pole in FIG. 2, and as shown in FIG. 4 to FIG. A rod 13 is slidably provided at a portion of the insulating molded product 4 corresponding to the position of the notch 9a, and is urged toward the circuit breaker body 8 by a spring 18. A flange 13a is formed at the end of the circuit breaker main body, and
The notch 9a fits inside the flange 13a in a state where the is pulled out. Then, for example, even if a force in the direction of the circuit breaker body is applied to the shutter plate 9 near the center pole,
Since the bending is prevented by a, the gap between the shutter plate 9 in the state of FIG. 4 and the end surface 2a of the frame-side terminal is maintained.

The rod 13 is pushed right by the edge 8a of the circuit breaker body after the shutter plate 9 moves downward during the insertion process of the circuit breaker body 8 and does not engage with the flange 13a. In the pull-out process, the shutter plate 9 returns to a position where the shutter plate 9 can be engaged with the flange 13a after detaching from the edge 8a of the circuit breaker main body.

Next, a second embodiment shown in FIGS. 7 to 9 will be described. The shutter device of this embodiment is provided with a lever 20 instead of the rod 13 of the first embodiment, and the lever 20 is provided with a spring 21 for rotating clockwise. In the operation of the second embodiment, the rotation of the lever 20 in the clockwise direction is prevented by the lever stopper 22 in FIG. At this time, since the engagement end 20a formed at the free end of the lever 20 is located on the left side of the shutter plate 9, the shutter plate 9 can be bent to the left similarly to FIG. 4 of the first embodiment. Can not. The lever 20 is rotated counterclockwise by being pushed by the edge 8a of the circuit breaker main body after the shutter plate 9 moves downward during the insertion process of the circuit breaker main body 8 and no longer engages with the engagement end 20a. In the pulling-out process, the shutter plate 9 returns to a position where the shutter plate 9 can be engaged with the engagement end 20a after detaching from the edge 8a of the circuit breaker body.
In the case of the second embodiment, the notch 9a of the shutter plate is not necessary.

Next, a third embodiment shown in FIGS. 10 and 11 will be described. In this embodiment, a shutter can be locked to the shutter device of the second embodiment in a state where the shutter is closed, and a lever 25 and a spring 26 are urged clockwise by a spring 24 on a shaft 23 so as to be counterclockwise. A lock lever 27 biased in the direction is rotatably provided. The lever 25 has an engagement end 25a and has the same configuration as the lever 2 of the second embodiment except that an elongated hole 25b is formed.
It is substantially the same as 0. The lock lever 27 has an engagement end 27a and an elongated hole 27b.

In the third embodiment, when the lock lever 27 is rotated clockwise with the shutter plate 9 closed as shown in FIG. 10, as shown in FIG. The engagement end 27a of the lock lever is the shutter plate 9
Move to the bottom of the edge. In this state, when the padlock 28 is mounted so as to pass through both the long holes 25b and the long holes 27b, the downward movement of the shutter plate 9 in the opening direction is prevented by the engagement end 27a of the lock lever, and the shutter plate 9 Is prevented by the engagement end 20a of the lever 20, it is possible to prevent an accident in which the frame side terminal 2 is exposed to cause an electric shock.

The embodiment of the present invention has been described above. However, the embodiment of the present invention disclosed above has the following features.
This is merely an example, and the scope of the present invention is not limited to the above embodiment of the present invention. The scope of the present invention is defined by the appended claims, and is intended to include all modifications within the scope and meaning equivalent to the appended claims.

[0022]

The present invention is embodied in the above-described embodiment. Even if a shutter plate having a long width and a small width in the width direction of the drawer frame is used, the drawer frame is subjected to a force to bend when the shutter plate is bent. Since the bending is prevented by the provided bending prevention member, safety against an electric shock accident or the like can be ensured, and the shutter device can be configured at a low cost.

[Brief description of the drawings]

FIG. 1 is a front view of a drawer frame to which a shutter device of a drawer type circuit breaker according to a first embodiment of the present invention is attached.

FIG. 2 is a side view of the drawer-type circuit breaker with the circuit breaker main body inserted therein, with the shutter device of FIG.

FIG. 3 is an exploded perspective view illustrating an insulator covering the periphery of the frame side terminal of FIG. 1;

FIG. 4 is a side view for explaining main parts of the embodiment of FIG. 1 when the circuit breaker main body is at a drawn-out position.

5 is a diagram corresponding to FIG. 4 when the circuit breaker main body is at an intermediate position between the insertion position and the extraction position.

FIG. 6 is a diagram corresponding to FIG. 4 when the circuit breaker main body is at the insertion position.

FIG. 7 is a side view for explaining main parts of the second embodiment when the circuit breaker main body is at a drawn-out position.

8 is a diagram corresponding to FIG. 7 when the circuit breaker main body is at an intermediate position between the insertion position and the extraction position.

FIG. 9 is a diagram corresponding to FIG. 7 when the circuit breaker main body is at the insertion position.

FIG. 10 is a side view for explaining main parts of the third embodiment when the circuit breaker main body is at a drawn-out position.

11 is a diagram when the shutter plate is locked in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side plate 2 Frame side terminal (2a end surface) 3 Frame side terminal (3a end surface) 5 Draw-out frame 8 Circuit breaker main body (8a edge) 9 Shutter plate (9a notch) 10 Shutter plate 11, 12 Shutter plate driving device 13 Rod (13a flange) 14 rod 15 fixed cylinder 16 movable cylinder 17, 18, 21, 24, 26 spring 20 lever (20a engagement end) 22 lever stopper 23 shaft 25 lever (25a engagement end, 25b lock hole) 27 lever ( 27a engagement end, 257 lock hole) 28 padlock

Claims (4)

[Claims] 1. A drawer frame having a frame-side terminal, and a circuit breaker body having a main body-side terminal which moves in the drawer frame and comes into contact with and disengages from the frame-side terminal. A shutter device for a multi-pole draw-out type circuit breaker, which is arranged in a line in the width direction of the draw-out frame, wherein the shutter device is provided separately on an input side and an output side which cover the breaker body side end surface of the frame side terminal. A shutter plate that can be displaced up and down, and holds both ends in the width direction of the shutter plate to expose the end surfaces of the frame-side terminals by exposing the shutter plate following the insertion or withdrawal of the breaker body. Or a drive mechanism for displacing so as to cover, when the breaker body is pulled out, moves to a position where the shutter plate can be engaged with the shutter plate, and the shutter plate moves in a direction in which the breaker body is pulled out. Prevent bending The blocking member of the shutter device of the draw out circuit breaker characterized by comprising an intermediate portion of the width direction of the drawer frame. 2. The shutter plate bending prevention member is a rod that moves in parallel with the movement of the circuit breaker body that is urged in a pull-out direction of the circuit breaker by a return spring, and the rod moves in the direction of the circuit breaker body. 2. A shutter device for a draw-out type circuit breaker according to claim 1, wherein an engagement end with a shutter plate which is urged toward the circuit breaker body is provided near an end. 3. The shutter plate bending prevention member is a lever whose free end is urged by a return spring in a direction in which the circuit breaker main body is pulled out, and is urged toward the circuit breaker main body by the free end. 2. The shutter device according to claim 1, further comprising an engagement end with the shutter plate. 4. A lock hole is formed in the lever, which is the shutter plate bending prevention member, and the lock lever, which is urged in a direction opposite to the urging direction of the lever and has the lock hole, is connected to the lever. Provided on the same axis, when the lock lever is rotated to a position where the two lock holes overlap with the shutter plate closed, the lock lever can be engaged with the shutter plate and moves in the opening direction of the shutter plate. 4. A shutter device for a draw-out type circuit breaker according to claim 3, wherein an engagement means for blocking is provided on said lock lever.