JPH09161625A - Shutter device of drawer type circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically cover the terminals of a mounting frame side when a circuit breaker main body is drawn out without mounting any special part on the circuit breaker main body. SOLUTION: When a circuit breaker main body 2 is drawn out from the inserted state, the contact between a main body side terminal 7 and a mounting frame side terminal 5 is canceled, and after a shutter holding plate 9 is horizontally moved together with a shutter plate 10 by the action of a first spring 14, the shutter plate 10 is moved upward by the action of a second spring 16 while sliding on the left end surface of a terminal cover 19, and when the shutter plate 10 covers the left end surface of the mounting frame side terminal 5, guide pins 11, 12 reach the starting point of guide grooves 9a, 9b. When the circuit breaker main body 2 is further drawn out, the horizontal movement of the shutter holding plate 9 is stopped by a stopper 8b, and a lock plate 18 is horizontally moved by the action of a spring, and consequently, the guide pin 11 is embraced by the cut part 18b thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device for automatically covering a terminal on a mounting frame side to prevent an electric shock accident when a breaker body of a drawer type circuit breaker is pulled out.

[0002]

2. Description of the Related Art A general drawer type circuit breaker is shown in FIGS. 8 and 9, and shows a mounting frame 53 having an insulator 52 to which the mounting frame side terminals 50 and 51 are mounted, and a front view. It is composed of a circuit breaker body 55 which is movable between a pair of side plates 54 of the mounting frame 53. The circuit breaker main body 55 has main body side terminals 58 and 59 that come into contact with the mounting frame side terminals 50 and 51 via the drawer contacts 56 and 57.

FIG. 8 shows a state in which the mounting frame side terminals 50 and 51 are in contact with the main body side terminals 58 and 59 and is in a normal use state. In this state, when the circuit breaker main body 55 is pulled out in the left direction, that is, in the front direction along a rail (not shown) in the left-right direction, as shown in FIG.
6 and 57 are separated from the mounting frame side terminals 50 and 51, the main circuit is disconnected, and the circuit breaker main body 55 can be removed from the mounting frame 53 by further pulling out to the left. Circuit breaker body 55
After removing, the mounting frame side terminal 5 is on the left side of the insulator 52.
Since the tips of 0 and 51 are exposed and there is a risk of electric shock if touched carelessly, a shutter device described below is provided according to the order.

This conventional shutter device includes a pair of guide members 60 fixed to a pair of side plates 54 of a mounting frame 53, a pair of shutter plate holding members 61 that can be horizontally moved by a pair of guide members 60, and a pair of shutter plate holding members 61. Shutter plate 62 bridged to the shutter plate holding member 61, a guide pin 63 that is moved by being guided by a long hole 61a formed in the shutter plate holding member 61 in the vertical direction, and a pair of shutter plates in which the guide pins 63 are implanted. A holding member 64, a pair of upper and lower shutter plates 65 bridged by the pair of shutter plate holding members 64, an operation pin 66 provided on the shutter plate holding member 64, and an inclined edge and a vertical edge that are engageable with the operation pin 66 are formed. The operation plate 67 and the shutter plate holding member 61 attached to the circuit breaker body 55 are biased in the direction in which the circuit breaker body 55 is pulled out. Has a spring not shown that.
Each of the shutter plates 62 and 65 has a mounting frame side terminal 5
Through holes 62a and 65a are formed so that 0 and 51 can be inserted therethrough.

The operation of this conventional shutter device will be described. In FIG. 9, the through hole 62a is the mounting frame side terminal 50,
Although the shutter plate 65 is located at a position facing 51, the mounting frame side terminals 50 and 51 are not exposed because the shutter plate 65 is located at a position that closes the through hole 62a. That is, in this state, the mounting frame side terminals 50, 51 are viewed from the front of the circuit breaker (leftward in this figure).
It's safe because you can't touch. When the circuit breaker main body 55 is inserted from this state, that is, moved to the right, the operating pin 66 is pressed by the inclined edge of the operating plate 67. By this pressing, the shutter plate holding member 64 moves upward along with the shutter plate 65 along the long hole 61a.
At this time, the shutter plate holding member 61 is not moved in the horizontal direction by the action of a spring (not shown).
Further, the breaker main body 55 is inserted, and when the through hole 65a and the through hole 62a are aligned, the operation pin 66 reaches the vertical edge of the operation plate 67, and the operation pin 6 is moved by the vertical edge of the operation plate 67.
6 is pressed horizontally. By this pressing, the shutter plate holding members 61, 64 are resisted against the action of a spring (not shown).
Moves to the right with the shutter plates 62 and 65, respectively. By this movement, the mounting frame side terminals 50, 51 project from the through holes 62a, 65a, and the pull-out contactor 56,
By contacting 57, the mounting frame side terminals 50, 51 and the main body side terminals 58, 59 are connected, and the connection state of FIG. 8 is obtained.

The operation of the shutter device when pulling out the breaker body 55 from the connected state to the disconnected state is performed because the shutter plate holding member 61 is biased in the pulling direction of the breaker body 55 by a spring (not shown). The shutter plate holding member 61 moves in the pull-out direction following the movement of the main body 55 in the pull-out direction, that is, the left direction in the drawing, and the shutter plate 65 moves downward by its own weight by performing the operation opposite to the above. It returns to the state of FIG.

[0007]

This conventional shutter device needs to be provided with a special operating means having an inclined surface on the circuit breaker body side. Further, in the insertion operation of the circuit breaker main body, the shutter plate 6 is moved while the shutter plate 65 moves upward.
The spring (not shown) acting on the shutter plate holding member 61 needs to be considerably strong in order to prevent the movement of the members 5, 62 to the right. Further, although it was possible to mount the above-mentioned drawer type circuit breaker in which there is no obstacle between the upper and lower terminals of the shutter plate, it has a compact structure, for example, Japanese Patent Application No. 5-24222. There is a problem in that it cannot be attached to the one proposed by the applicant in the publication.

[0008]

In order to solve the above-mentioned problems, the present invention does not require a special structure for transmitting the acting force for driving the shutter device in the breaker body, but requires the shutter device. This configuration is provided on the mounting frame side. Further, the shutter plate is composed of one sheet, and the movement of the shutter plate in the horizontal direction during the insertion operation of the circuit breaker main body can be restricted by a fixed object without necessarily requiring a strong spring.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is provided with a guide member having guide means in the moving direction of the circuit breaker body inside the side plates facing each other of the mounting frame, and the guide means is pressed when the circuit breaker body is inserted. A shutter holding plate that is movable along is attached. On the shutter plate, two guide pins protruding in the left-right direction are arranged at both ends in the vertical direction. Two guide grooves are formed in each of the left and right shutter holding plates, and guide pins of the shutter plate are inserted into these two guide grooves to hold the shutter plate by the shutter holding plates. Therefore, when the guide pin slides in the guide groove, the shutter plate moves. Since the vertical distance between the two guide grooves is equal to the vertical distance between the two guide pins of the shutter plate, even if the guide pins move along the guide grooves, the shutter plate is not moved. Always maintain vertical orientation.

The shutter plate is provided with a second spring,
The guide pin of the shutter plate is positioned at the starting point of the guide groove of the shutter plate holding member when the circuit breaker body is in the disconnection position because it is biased in a direction to cover the mounting frame terminal. In this position, the shutter plate covers the mounting frame terminal. The guide groove of the shutter holding member is formed so that the breaker body is pulled out in the horizontal direction from this starting point and the shutter plate is opened in the vertical direction.

Therefore, the shutter holding member tries to move in the inserting direction of the circuit breaker body together with the shutter plate by the inserting operation. However, since the stopper means for restricting the movement of the shutter plate in the insertion direction is provided, only the shutter holding plate moves in the insertion direction. Therefore, the guide pin moves in the direction in which the shutter plate opens in the vertical direction along the guide groove of the shutter holding plate. The insulating barrier 19 serves as a stopper in an embodiment described later.

Further, since the shutter holding plate is provided with the first spring for urging the circuit breaker main body in the pulling direction, the shutter holding member moves following the movement of the circuit breaker main body when the circuit breaker main body is pulled out. Then, the shutter plate is closed in the opposite procedure to the insertion of the breaker body.

The two guide grooves formed on the shutter holding plate may be linear or curved, and any distance may be maintained in the vertical direction as long as the distance between the guide pins of the shutter plate is maintained.

Further, the shutter holding plate is provided with a lock plate which is biased so as to slide in the drawing direction of the circuit breaker main body, and the lock pin holds the guide pin at the starting point of the guide groove. The guide pin is prevented from moving along the guide groove even if the shutter body itself is pushed downward when the main body is in the disconnecting position and an attempt is made to open it. When inserting the circuit breaker body,
First, since the lock plate is pressed to unlock the guide pin, the shutter plate normally opens. It is also possible to provide a through hole in a portion where the shutter holding plate and the lock plate overlap with each other and lock them with a padlock.

A guide groove formed in the shutter holding plate is formed with an inflection portion capable of holding the shutter plate in an open state, and the guide pin is moved to this inflection portion when the circuit breaker main body is in the disconnection position. The board is open for easy maintenance and inspection. Even if the circuit breaker body is inserted in this state, the shutter holding plate moves in the insertion direction,
The guide pin relatively returns to the original position of the guide groove from the inflection portion and operates normally.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a shutter device for a drawer type circuit breaker according to the present invention is shown in FIGS. FIG.
1 is a side sectional view of a drawer type circuit breaker to which this shutter device is attached, showing the attachment frame 1 and the attachment frame 1 in front,
That is, when viewed from the left, the circuit breaker main body 2 is movable between a pair of opposing side plates. The mounting frame 1 is provided with mounting frame side terminals 4 and 5 mounted on the insulator 3, and the circuit breaker body 2 is provided with body side terminals 6 and 7 in the direction of the mounting frame side terminals 4 and 5, respectively, which are not shown in the drawings. Prepared by being urged by. In FIG. 2, the circuit breaker main body 2 is inserted into the mounting frame 1 and the mounting frame side terminals 4 and 5 are respectively body side terminals 6 and 7.
Is shown in a state of being in contact with the mounting frame side terminal 4 by a movable contactor 17 operated by an opening / closing mechanism (not shown).
And the mounting frame side terminal 5 are electrically opened and closed.
When the circuit breaker main body 2 is pulled out from the state shown in FIG. 2, that is, moved to the left in the figure, the contact between the mounting frame side terminals 4 and 5 and the main body side terminals 6 and 7 is eliminated, and the circuit breaker is established.

For convenience of construction, the circuit breaker main body 2 has a protrusion 2 at the inner portion thereof, that is, at the center of the right end in FIG.
a is formed, and the space of the connecting portion between the mounting frame 1 and the circuit breaker body 2 is vertically divided into A and B. Therefore, two sets of shutter devices are provided corresponding to the mounting frame side terminals 4 and 5. In FIG. 2, shutter plates 10 and 1 to be described later are provided.
Only 0 ′ is shown, and the upper shutter plate 10 ′ is moved above the mounting frame side terminal 4 and the lower shutter plate 10 is moved below the mounting frame side terminal 5, respectively. The configuration and operation of these shutter devices will be described below. However, since this shutter device operates vertically and symmetrically with the same structure, only the lower device will be described.

FIG. 1 is a perspective view showing a main part of this shutter device, and FIGS. 3 to 7 are partial views of a guide groove 8a of a guide member 8 described later in FIG. . This shutter device has a guide member 8 provided symmetrically inside the side plates facing each other of the mounting frame 1, a shutter holding plate 9, and a shutter plate 10 bridged between the left and right shutter holding plates 9. The shutter plate 10 is an insulating plate, has a notch edge 10a at its upper part, and block members 13 are attached to both ends thereof, and the block members 13 are protruded from the shutter plate 10 to the left and right and vertically. Two guide pins 11 and 12 are lined up side by side. Since this circuit breaker is for 3 poles, the notch edge 10a is 3
It is provided in various places.

The guide member 8 is provided with guide grooves 8a in the moving direction of the circuit breaker body 2 at the upper and lower portions. The shutter holding plate 9 is slidable along the guide groove 8a, and is biased to the left in the drawing by the first spring 14 provided between the shutter holding plate 9 and the guide member 8, and the bent portion 9c is bent. The stopper 8b, which is formed by being bent in the direction of, is brought into contact with the stopper 8b to restrict its slide. The shutter holding plate 9 is formed with two guide grooves 9a and 9b starting from the vicinity of the center of the upper portion and directed diagonally downward to the left. Guide pins 11 and 12 are inserted into the two guide grooves, respectively, so that the shutter plate 10 is maintained in the vertical direction even if the guide pins 11 and 12 slide along the guide grooves. The guide grooves are parallel straight lines. Note that these grooves do not have to be parallel straight lines as long as the shutter plate 10 is maintained in the vertical direction even when the guide pins 11 and 12 slide.

A spring holding member 15 attached to the tips of the guide pins 11 and 12 and a bent portion 9c of the shutter holding plate 9.
Is provided with the second spring 16, and the guide pin 1
Nos. 1 and 12 are urged along the guide grooves 9a and 9b in the respective starting directions, that is, in the upper right direction. The shutter holding plate 9 is further provided with a lock plate 18 which is biased by a spring (not shown) in a direction in which the breaker body 2 is pulled out.
Is slidably provided. One end 18a of the lock plate 18 projects from the shutter holding plate 9, and the guide pin 11 is formed by a "U" -shaped notch 18b formed at the other end.
The guide pin 11 is prevented from sliding, that is, the shutter plate 10 is prevented from moving.

On the other hand, the mounting frame side terminal 5 has a contact member 5b having a contact surface 5a with the main body side terminal 7 and an outside wire connecting member 5c.
And a connecting member 5d for connecting them. Of these, the contact member 5b and the coupling member 5d located on the circuit breaker main body side, that is, on the left side of the insulator 3 are covered with an insulating terminal cover 19 except the contact surface 5a to be insulated from the surroundings. Further, the back of the circuit breaker main body 2, that is, the structure 2b at the right end in the figure, faces the shutter holding plate 9 and the lock plate 18.

The operation of the shutter device constructed as above will be described. FIG. 3 shows a disconnection state in which the breaker body 2 is pulled out. In this state, the shutter holding plate 9 is located at the left end of its movable range and the second spring 16
By this action, the guide pins 11 and 12 are positioned at the starting points of the guide grooves 9a and 9b of the shutter holding plate 9, respectively, and the shutter plate 10 contacts the contact surface 5 of the mounting frame side terminal 5 with the main body side terminal 7.
a. Further, in this state, since the "U" -shaped notch 18b of the lock plate 18 holds the guide pin 11 and the guide pin 11 cannot move, the shutter plate 10 itself is accidentally pushed downward to open. It is safe because it cannot be opened.

In this state, when the insertion operation of the circuit breaker main body 2 is performed, the circuit breaker main body 2 moves to the right and is pressed by the structure 2b so that the lock plate 18 moves to the right against the action of the spring (not shown). When the guide pins 11 are moved, the holding of the guide pins 11 by the “U” -shaped notches 18b is eliminated, and the guide pins 11 and 12 are in a movable state. At this time, the structure 2c is in contact with the left end of the shutter holding plate 9. Further, when the insertion operation of the circuit breaker body 2 is continued, the shutter holding plate 9 is pressed against the action of the first spring 14 and moves to the right together with the shutter plate 10. Immediately after this movement starts, the shutter plate 10 has the terminal cover 1 slightly protruding leftward from the left end of the contact member 5b of the mounting frame side terminal 5.
It contacts the left end surface of 9 and is prevented from moving to the right. Due to this blocking, the left edges of the guide grooves 9a and 9b press the guide pins 11 and 12 against the action of the second spring 16 and move vertically downward along the left edges. That is, the shutter plate 10 vertically moves downward while sliding on the left end surface of the terminal cover 19. Further, when the circuit breaker body 2 is inserted, the contact surface 5a of the mounting frame side terminal 5 becomes the shutter plate 1
It is exposed from the notch edge 10a of 0 and the notch edge 10a reaches the lower side of the terminal cover 19 to be in the state of FIG. In this state, the shutter plate 10 can move to the right, and when the insertion operation is continued, the shutter plate 10 moves horizontally to the right along with the shutter holding plate 9 while sliding under the terminal cover 19. Further, when the circuit breaker main body 2 is inserted, the main body side terminal 7 comes into contact with the attachment frame side terminal 5 and the insertion operation of FIG. 5 is completed.

The operation of pulling out the circuit breaker main body 2 from this inserted state is the reverse of the above, first, the contact between the main body side terminal 7 and the mounting frame side terminal 5 is eliminated, and the shutter holding plate is acted by the action of the first spring 14. When the shutter plate 10 moves to the left with the shutter plate 10 and the engagement between the notch edge 10a and the lower portion of the terminal cover 19 is released, the shutter plate 10 moves along the left end surface of the terminal cover 19 following the movement of the shutter holding plate 9. Second while sliding
The shutter plate 10 moves upward by the action of the spring 16 of the shutter plate 10.
Covers the left end surface of the mounting frame side terminal 5, the guide pins 11, 1
2 reaches the starting points of the guide grooves 9a and 9b. When the circuit breaker body 2 is further pulled out, the leftward movement of the shutter holding plate 9 is stopped by the stopper 8b, and the lock plate 18
Is moved to the left by the action of a spring (not shown), and the "U" -shaped notch 18b holds the guide pin 11 and returns to the state of FIG.

In the state of FIG. 2, even if the shutter plate 10 is directly operated as described above, the contact surface 5 of the mounting frame side terminal 5 is contacted.
a cannot be exposed. However, for maintenance and inspection work, when it is desired to expose the contact surface 5a with the circuit breaker body 2 pulled out for inspection, the lock plate 18 is pushed by hand to hold the guide pin 11 by the "U" -shaped notch 18b. If the shutter plate 10 is pushed downward after
The guide pins 11 and 12 can move along the groove of the shutter holding plate 9 to expose the contact surface 5a. When it is desired to hold the shutter plate 10 in the exposed state, the guide pin 12 may be moved from the end of the guide groove 9b to the inflection portion 9d, and in this state, the second spring 16 moves to the upper right. The guide pins 11 and 12 do not self-return to the starting point because they act toward each other. This state is shown in FIG.

Even if the main body of the circuit breaker is erroneously inserted while keeping this state, the shutter holding plate 9 moves to the right and the lower end of the shutter plate 10 is attached to the mounting frame 1 as shown in FIG. Even if the shutter holding plate 9 abuts on the insulator 3 and moves to the right, the shutter plate stays at that position, so the shutter plate 10 moves relatively to the left, and the guide pin 12 bends. It returns to the linear guide groove 9b from the portion 9d, and returns to normal operation.

In the state shown in FIG. 3, a hole 9 penetrating both the shutter holding plate 9 and the lock plate 18 at the overlapping position.
e and 18c are formed respectively, and the operation of the lock plate 18 can be completely prohibited by inserting a padlock into this hole, so that the safety can be further enhanced.

In the present embodiment, since the shutter holding plate 9 is pressed by the structure of the circuit breaker main body, no special parts for this shutter device are necessary in the circuit breaker main body, If it is impossible, a simple component for pressing may be attached to the main body.

[0029]

According to the shutter device of the drawer type circuit breaker according to the present invention, since it is not necessary to attach special parts to the breaker body, the breaker body can be easily handled and the shutter device is attached to the mounting frame. If any of the circuit breaker main bodies is attached, the shutter device can be operated only by attaching simple parts.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an embodiment of a shutter device of a drawer type circuit breaker according to the present invention.

2 is a side cross-sectional view of a drawer-type circuit breaker to which the shutter device of FIG. 1 is attached, and is a view when the breaker body is in a connected state.

3 is a side cross-sectional view of the shutter device of FIG. 1 when the breaker body is in a disconnecting state.

FIG. 4 is a side cross-sectional view of the shutter device of FIG. 1 when the breaker body is between a disconnection state and a connection state.

5 is a side cross-sectional view of the shutter device of FIG. 1 when the breaker body is in a connected state.

6 is a side cross-sectional view of the shutter device of FIG. 1, showing a state in which the breaker body holds the shutter plate in an open state in a disconnecting state.

FIG. 7 is a diagram illustrating a state in which the shutter plate automatically returns to normal operation when the breaker body is inserted from the state of FIG. 6;

FIG. 8 is a side cross-sectional view of the shutter device of the conventional drawer-type circuit breaker when the breaker body is in a connected state.

FIG. 9 is a side cross-sectional view of a shutter device of a conventional pull-out type circuit breaker when the breaker body is in a disconnecting state.

[Explanation of symbols]

 1 Mounting Frame 2 Circuit Breaker Main Body 8 Guide Member 9 Shutter Holding Plate 9a, 9b Guide Groove 9d Inflection Part 10 Shutter Plate 11, 12 Guide Pin 14 First Spring 16 Second Spring 18 Lock Plate

Claims (3)

[Claims] 1. A circuit breaker main body having a mounting frame having a mounting frame side terminal and a main body side terminal which horizontally moves between left and right side plates of the mounting frame to contact and separate from the mounting frame side terminal. A pull-out type circuit breaker shutter device, comprising: guide means for moving the circuit breaker main body provided inside each side plate of the mounting frame; and a shutter plate that covers the mounting frame side terminal in a vertical state. A pair of left and right shutter holding plates, each of which has two guide grooves, is pressed by the circuit breaker body and moves along the guide means when the circuit breaker body is inserted, and an end portion of the shutter plate. And two guide pins on the left and right, which are vertically aligned with each other and one end of which is connected and the other end of which is inserted into a guide groove of the shutter holding plate, and the shutter holding plate from which the breaker body is pulled out. A first spring that biases the shutter plate in a direction in which the shutter plate covers the mounting frame side terminal; and a second spring that biases the shutter plate in a direction in which the shutter plate covers the mounting frame side terminal, Stopper means for preventing the shutter plate from moving in the insertion direction of the circuit breaker body, and the two guide grooves formed in the shutter holding plate have a vertical interval between the two guide pins. And the shutter plate is formed upward or downward in the direction in which the breaker body is pulled out from the position of the guide pin when the shutter plate covers the mounting frame side terminal. Drawer type circuit breaker shutter device. 2. The shutter retaining plate is provided with a lock means for biasing the guide pin in a direction that prevents the guide pin from moving at a position where the shutter plate is closed, and the shutter holding plate is interrupted when the circuit breaker body is inserted. 2. The shutter device for a drawer type circuit breaker according to claim 1, wherein the device main body first presses the locking means to make the guide pin movable and then presses the shutter holding plate. 3. A guide groove formed in the shutter holding plate is formed with a bent portion that bends in the insertion direction of the circuit breaker body, and the shutter plate is opened when the guide pin is in the bent portion. The pull-out type circuit breaker shutter device according to claim 1 or 2, wherein the shutter device can be held in the open position.