JPH11341623A - Position indicating device for pullout type circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position indicating device for pullout type circuit breaker which can surely indicate that the main body of a circuit breaker reaches a connecting position. SOLUTION: A working plate 37 which is locked by means of the locking piece 29 of a pullout frame is slidably provided to a base plate 35 attached to the main body of a circuit breaker and an indicator 33 is attached to the arm of a working lever 38 provided with a working pin 42 engaged with the working groove 44 of the working plate 37. Until the main body of the circuit breaker reaches a connecting position, a position indicating device detects the sliding amount of the working plate 37 relatively to the base plate 35, namely, the moving amount of the main body and the working lever 38 rotates. After the main body reaches the connecting position, a connecting rod 26 largely rotates the working lever 38 by pushing the working pin 42 relatively moved to the right end section of a groove 44e to the left end section of the groove 44e through an operation enlarging lever 39 and a push lever by pushing up an enlargement actuator 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draw-out type circuit breaker, and more particularly to a position indicating device of the circuit breaker body.

[0002]

2. Description of the Related Art A drawer-type circuit breaker includes a drawer frame attached to a switchboard and the like, and a circuit breaker body that is linearly movable between a connection position, a test position, and a disconnection position in the drawer frame. The drawer frame is provided with a main circuit terminal to which the main circuit wire is connected and an auxiliary circuit terminal to which the auxiliary circuit wire for control and operation is connected. Make contact with contacts and auxiliary circuit contacts. In the test position, the main circuit terminal and the main circuit contact do not contact each other, but the auxiliary circuit does. further,
At the disconnection position, neither the main circuit nor the auxiliary circuit comes into contact.

This draw-out type circuit breaker safely and continuously supplies a large value of rated current to a main circuit at a connection position, or safely supplies a short-circuit current of several hundred thousand amperes for a short time. For the purpose, it must be configured such that a large contact pressure is generated between the main circuit terminals and the main circuit contacts. On the other hand, in the disconnecting position, the main circuit contact and the auxiliary circuit contact should be separated from the main circuit terminal and the auxiliary circuit terminal of the draw-out frame by a sufficiently large insulation distance so that the breaker body is reliably insulated from the electric circuit. Need to be configured.
In the test position, it is necessary to maintain a sufficient insulation distance between the main circuit contact and the main terminal, but since a large current does not flow through the auxiliary circuit, the auxiliary circuit terminal and the auxiliary circuit contact There is no need to generate a large contact pressure between them.

When the circuit breaker body of such a draw-out type circuit breaker is inserted from the disconnection position to the connection position, the moving distance is large, but the resistance is small with little resistance until the main circuit contact contacts the main circuit terminal. Can be inserted. However, it is necessary to move the circuit breaker body further from the position where both contacted so that the contact pressure is maintained even if the contact surface where they contact is worn or deformed. Requires a large operating force. Then, the position inserted in this manner becomes the connection position.

[0005]

The drawer-type circuit breaker of the prior art uses a worm gear as a drawer insertion mechanism for moving the circuit breaker main body, and the moving distance of the circuit breaker main body is the rotation speed of the worm gear, that is, the operation of the worm gear. The structure was almost proportional to the number of steering wheel rotation operations performed by the driver. This draw-out insertion mechanism allows the insertion operation in which the main circuit contact comes into contact with the main circuit terminal to the connection position, but the movement distance is small but large contact pressure is applied, with a reasonable operating force. The worm gear was selected so that the number of rotation operations was large for the distance traveled. However, in such a structure, there is a problem that the number of rotation operations of the worm gear is considerably increased for a long distance movement from the disconnection position to the contact between the two.

A drawer-type circuit breaker having a drawer insertion mechanism that solves such operational problems has been proposed by the present applicant. This drawer-type circuit breaker has a structure in which the insertion speed of the circuit breaker main body is changed on the way even if the drawer operation handle is operated at a constant speed. Simple configuration with just a screw that can be inserted with a large moving distance with a small number of rotations, and insertion with a small number of rotations with a large number of rotations in the insertion operation from just before contact pressure is applied to the connection position It has a combination structure using a large lever so that it can be used. However, in the latter drawer-type circuit breaker, since the movement distance of the circuit breaker main body between the position where the main circuit terminal and the main circuit contact is in contact and the connection position is small, the operator needs to operate the position display device. Unless the indicators are correctly fitted, there is a problem that a sufficient contact pressure cannot be obtained. SUMMARY OF THE INVENTION It is an object of the present invention to provide a drawer-type circuit breaker position display device in which the insertion operation is simple and the position of the breaker body can be reliably displayed.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a drawer-type circuit breaker position display apparatus according to the first aspect of the present invention has a drawer frame having a main circuit terminal and moves in the drawer frame. This increases the amount of screwing in between the breaker body provided with the main circuit contact that comes into contact with and separated from the main circuit terminal, the male screw member provided on one of the drawer frame and the breaker body, and the female screw member provided on the other. A drawer insertion mechanism for inserting the main body of the circuit breaker by inserting the main circuit contact into the main circuit terminal and before and after the insertion operation is completed. A draw-out insertion mechanism that is larger than the screw-in amount of the male screw member and the female screw member with respect to the unit movement amount of the breaker body in the insertion operation until the screw-in amount of the female screw member reaches before and after the contact starts. A drawer-type circuit breaker, comprising: a display member that is displaced according to the position of the circuit breaker main body to indicate that the circuit breaker main body has reached a predetermined position, wherein the display member is a circuit breaker main body. Until the breaker body reaches the connection position, it is displaced while detecting the relative movement distance between the breaker body and the draw-out frame, and when the breaker body reaches the connection position, the screw-in amount of the male screw member and the female screw member is predetermined. Is configured to be displaced by the operation of the displacing member that is displaced when the amount becomes.

The position indicating device of the drawer-type circuit breaker of the invention according to claim 2 is the device according to claim 1,
An engaging edge formed on an operation plate provided in a stationary state with respect to the movement of the circuit breaker main body at an angle with a moving direction of the circuit breaker main body; an operation lever rotatably supported by the circuit breaker main body; And an operating pin provided on the other arm of the operating lever and sliding on the engaging edge in accordance with the movement of the circuit breaker main body. Until it reaches, the operating pin rotates the operating lever by sliding on the engaging edge, and when the breaker main body is at the connection position and the male screw member and the female screw member are screwed in a predetermined amount, the displacement member becomes the operating lever. Is further rotated. Further, the position indicating device of the drawer-type circuit breaker according to the invention according to claim 3 is the device according to claim 2, wherein the displacement member includes an operation expanding lever that rotates when the male screw member and the female screw member are screwed by a predetermined amount. And a push lever which is interposed between the operation expanding lever and the operation pin and rotates following the rotation of the operation expanding lever.

According to the first, second and third aspects of the present invention, in the insertion operation, when the main circuit contact comes into contact with the main circuit terminal and the circuit breaker body moves until the main circuit contact reaches the connection position, a screw is required. The displacement of the display device is also small because the amount of movement of the circuit breaker main body is small for the number of rotation operations. But,
When the breaker body is at the connection position, the display member is displaced at a rate corresponding to the screwing amount of the screw, so even if the screw is rotated at the same operation speed, it will be displayed when it reaches the connection position The displacement ratio of the member greatly changes, and a digital display can be made mechanically. In the configuration of the third aspect, by interposing a push lever between the operation enlarging lever and the operation pin, the screwed-in amount of the screw can be enlarged and the operation lever can be rotated, thereby enabling a stable display.

Next, a drawer-type circuit breaker position display device according to a fourth aspect of the present invention is a drawer frame having a main circuit terminal and an auxiliary circuit terminal, and a main circuit terminal and an auxiliary circuit by moving in the drawer frame. Displacement according to the position of the breaker body of the drawer-type circuit breaker, which includes a main body contactor and an auxiliary circuit contactor that respectively contact with and separate from the terminal, and a drawer insertion mechanism that moves the main body. A display member that indicates that the circuit breaker body has reached a predetermined position by a display member, wherein the display member has an engagement edge formed with an engagement edge having an angle that intersects a moving direction of the circuit breaker body. The engaging edge member and the sliding member are displaced by a sliding member that slides on the engaging edge relative to the member, and one of the engaging edge member and the sliding member is provided so as to move together with the breaker body in the insertion operation and the other does not move. , Engagement edge Intersection angle between the moving direction of the breaker body, the breaker body is in a the person when moving the predetermined position is formed to be larger than when moving around the predetermined position.

With such a configuration, the intersection angle between the engaging edge and the moving direction of the circuit breaker main body when the circuit breaker main body is moved to a predetermined position such as a disconnection position, a test position, a connection position, etc. Because the crossing angle between the engaging edge and the moving direction of the breaker body before and after the position is larger, the displacement of the display device per unit moving distance of the breaker body is larger in the former than in the latter, and the display member is Variations in the position of the breaker body with respect to the same designated scale width are reduced.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a drawer-type circuit breaker according to an embodiment of the present invention. FIGS. 1 to 3 are side views of a drawer-type circuit breaker employing the position display device according to the present embodiment.
And a circuit breaker main body 3 movable in the left-right direction along the side plate 2 of the drawer frame 1. Main circuit terminals 5 and 6 are attached to a drawer frame 1 on a terminal block 4 made of an insulating molded product, and an auxiliary terminal block 8 having an auxiliary circuit terminal 7 is provided on a side plate 2. The circuit breaker body 3 includes an opening / closing mechanism (not shown) for opening / closing the opening / closing contact, a main circuit contact 11 rotatably held by a shaft 10 so as to come into contact with one of the opening / closing contacts 9, and a main circuit contact 11 And a main circuit contact spring 12 for making the main circuit terminal 6 always contact the open / close contact 9 and making the main circuit terminal 5 freely contactable. Since the same applies to the main circuit terminal 6, the main circuit terminal 5 will be described below. The contact spring 12 is used to continuously and stably supply the rated current of the circuit breaker or to supply a large short-circuit current for a short time without any trouble.
A member having a large acting force such that a large contact pressure is generated between the terminal 1 and the main circuit terminal 5 is selected. In the breaker body,
Further, an auxiliary circuit contact block 14 having an auxiliary circuit contact 13 is provided.

The breaker main body 3 of the draw-out type circuit breaker includes:
Upper and lower rails 20 attached to the inside of the side plate 2 of the drawer frame 1 are provided with drawer rollers 19 rotatably provided outside thereof.
And is movable along the rail 20.

The structure of a drawer insertion mechanism for inserting and pulling out the circuit breaker body 3 will be described with reference to FIGS. The drawer insertion mechanism includes a drawer operation bolt 21 provided on the circuit breaker main body 3, the axial direction of which is a left-right direction, and a frame-shaped drawer operation bolt holding frame 22 fixedly attached to the circuit breaker body 3. A drawer operating shaft 23 provided at the center of the right end of the circuit breaker main body 3; and a drawer operating lever 25 provided in the drawer frame 1 and rotatably provided by a shaft 24; a drawer operating lever 25; It comprises a connecting rod 26 for connecting the bolt 21 and a detachable operation handle 27 for rotating the pull-out operation bolt 21.

The pull-out operation bolt 21 includes a large-diameter portion 21a and a male screw portion 21b located in the pull-out operation bolt holding frame 22, and is inserted through a hole formed at the right end of the pull-out operation bolt holding frame 22 to perform a pull-out operation. Held by the bolt holding frame 22,
Since the external thread 21b is formed on the connecting rod 26,
a, and the end of the connecting rod 26 is connected to the pull-out operation lever 25 by a shaft 28 at a connecting end 25a. At the other end of the pull-out operation lever 25, in FIG.
A notch composed of a notch 25b in a substantially right and left direction and a notch 25c extending diagonally rightward and formed continuously with the notch 25b is formed, and the drawing operation shaft 23 meshes with the notch 25b. ing. An engaging piece 29 for operating the position display device of the present embodiment, which will be described later, is formed on the bottom plate of the drawer frame 1 by cutting and bending.

The operation of this operation mechanism is as follows. When the operation handle 27 having a hexagonal pillar in FIG. 1 is inserted into a hexagonal hole 21c formed at the left end of the pull-out operation bolt 21 and rotated, the pull-out operation bolt 21 rotates. I do. This rotation does not cause the pull-out operation bolt 21 to move on the circuit breaker body in the left-right direction, but the male thread portion 21 b is screwed into the female thread portion 26 a of the connecting rod 26. With this screwing,
The pull-out operation lever 25 is urged to rotate clockwise, and by this urging, the notch 25
At (b), the circuit breaker main body 3 is urged by the force in the direction of F1 so as to be lifted upward via the pull-out operation shaft 23. The pull-out operation lever 25 also hardly rotates. Therefore, male screw 2
1b is screwed into the female thread portion 26a, so that the draw-out operation bolts 21 and the circuit breaker main body 3 move to the right.
At this time, since the contact pressure has not yet been generated between the main circuit terminal 5 and the main circuit contact 11, even if the male screw portion 21b and the female screw portion 26a have a relatively large screw pitch,
The circuit breaker main body 3 can be moved with a small rotation operation force of the operation handle 27. That is, in the insertion operation having a large moving distance from the state shown in FIG. 1 to the stage just before both contact in FIG. Moving. While moving from FIG. 1 to FIG. 2, the auxiliary circuit contact 13 passes through a test position where the auxiliary circuit terminal 13 makes sliding contact with the auxiliary circuit terminal 7.

In the state shown in FIG. 2, the pull-out operation shaft 23 is located on the boundary between the notch 25b and the notch 25c. At this time, the pull-out operation shaft 23 is urged through the pull-out operation shaft 23 by a force in the direction of F2. The biasing force in the direction does not contribute to the movement of the circuit breaker main body 3, and the circuit breaker main body 3 moves rightward due to the horizontal component force FH of F2. By the way, the dimension L relating to the rotational moment at the point of action 25d where the force F2 acts is shown.
1 is a dimension L2 relating to the rotational moment at the connecting end 25a to which the rotational driving force of the pull-out operation lever 25 is transmitted.
Considerably smaller than. That is, although the pull-out operation lever 25 rotates and the leftward movement distance at the connection end 25a is large, the rightward movement distance at the action point 25d is small, but it acts on the connection end 25a. There is an advantage that a large force acts on the action point 25d even if the force F is small. Therefore, if the insertion operation is continued from the state shown in FIG. 2, the pull-out operation shaft 23 is in a position where it is stuck in the notch 25c, and almost all of the urging force F2 becomes a horizontal component, and the circuit breaker body 3 further moves rightward. Then, the main circuit terminal 5 comes into contact with the main circuit contact 11. The main circuit contact 11 is operated with a small operating force by operating the operation handle 27 many times against a large contact pressure while sliding on the tapered portion 5 a formed at the corner of the main circuit terminal 5. The circuit breaker main body 3 can be moved to the connection position 3. Although the number of rotation operations is large, there is no problem because the moving distance of the circuit breaker main body 3 from FIG. 2 to FIG. 3 is considerably smaller than the moving distance from FIG. 1 to FIG.

FIGS. 4 to 7 are partial views showing the position display device of the present embodiment located at the bottom of the circuit breaker main body, and FIG. 4A is a schematic front view of the position display device. 4
(B) is a view of the position display device as viewed from the bottom, and all show the state of FIG. 1 in which the circuit breaker main body 3 is in the disconnection position. FIGS. 5 to 7 are operation diagrams in which the main parts of FIG. 4 are taken out.

In FIG. 4A, the front cover 30 of the position display device has "CONN." Corresponding to the connection position, test position, and disconnection position of the insertion hole 31 of the operation handle 27 and the breaker body 3, respectively. "TEST" and "IS
A display window 32 on which the characters “OLATED” and its scale are displayed is formed, and the position of the breaker body 3 is displayed by moving the indicator 33 through the display window 32.

In FIG. 4B, the pull-out operation bolt holding frame 22 shown in FIG. 1 comprises a frame 34 and a base plate 35 serving as a substrate of this position display device. Are rotatably held by the bearing hole 35a and the bearing plate 36. Base plate 3
5, an operation plate 37 is slidably provided, an operation lever 38 and an operation enlargement lever 39 are rotatably provided, and an inner side of the cover 30 is provided with an indicator plate 40 which is slidable left and right and has an indicator 33.

The operating plate 37 has guide holes 35b and pins 41 formed on the base plate 35 in long holes 37a and long holes 37b formed in the moving direction of the circuit breaker main body 3, respectively.
And is urged downward in the figure by a spring (not shown) and stays at the position shown in the figure by a locking piece 29. The operation lever 38 is urged in a counterclockwise direction by a spring (not shown), and has an operation pin 42 and a pin 43 on both arms thereof. The operation pin 42 is fitted into an operation groove 44 formed in the operation plate 37. 43
Is fitted in a notch 40a in the vertical direction of the indicator plate 40. The operation expanding lever 39 is urged clockwise by a spring (not shown), and
6 is rotatably held and a pin 45 is provided. The expansion actuator 46 extends to the root of the external thread portion 21 b of the pull-out operation bolt 21 and is slidable substantially in the moving direction of the circuit breaker main body 3.

The push lever 47 is biased clockwise by a spring (not shown) and is rotatably held on the operation plate 37. The right edge of the push lever 47, which is bent in a U-shape, is formed on the base plate 3.
5 and is engaged with the pin 48 and is locked. The operation groove 44 of the operation plate 37 has a groove 44a having a corresponding intersection angle with respect to the movement direction of the circuit breaker main body 3 and a cross angle smaller than the groove 44a, that is, more parallel to the movement direction of the circuit breaker body 3. The crossing angle of the close groove 44b and the groove 44a is larger than that of the groove 44a.
c, a groove 44d parallel to the moving direction of the circuit breaker main body 3, and a wide groove 44e located at the end of the groove 44d and orthogonal to the moving direction of the circuit breaker main body 3 are formed so as to be continuous. . As shown in FIG. 8, which will be described later, the shape of the operation groove 44 is such that the indicator 33 per unit movement amount of the circuit breaker body 3 when the circuit breaker body 3 moves to the disconnection position, the test position, and the connection position. Is greater than when the circuit breaker body 3 moves from any of those positions to any of the other positions.

When the operating handle 27 is rotated from the state shown in FIG. 4 and the drawer operating bolt 21 is rotated to insert the breaker main body 3, the operating plate locked by the locking piece 29 formed on the drawer frame 1. Other than 37 and the push lever 47 held by this operation plate 37, it moves downward with the circuit breaker main body 3. With this movement, the operation pin 42 is moved from the groove 44a to the groove 44a.
The movement lever 38 rotates clockwise following the movement from the groove 44b to the groove 44c, and when the circuit breaker main body 3 reaches the connection position as shown in FIG.
At the position 4c, the indicator 33 indicates the scale of "TEST". When the operation handle is further rotated,
The operation pin 42 reaches the intersection of the groove 44c and the groove 44d. At this time, the indicator 33 indicates “TEST” and “CON”.
N. "And an intermediate position. When the operation handle 27 is further rotated, the operation pin 42 moves along the groove 44d. During this movement, the operation lever 38 does not rotate, and the indicator 33 does not move. During this operation, the right edge of the push lever 47 is the pin 48 → the operation enlargement lever 3
The shaft 49 which supports the shaft 9 → the pin 45 is sequentially slid and rotated clockwise to reach the state shown in FIG. In the state shown in FIG. 6, the end surface 26b of the connecting rod 26 is substantially in contact with the end surface 46a of the enlarged actuator. At this time, the position of the breaker body 3 is substantially at the connection position shown in FIG.

Subsequently, when the operating handle 27 is rotated, the circuit breaker main body 3 hardly moves, but the connecting rod 26 moves upward, and the operation expanding lever 39 is rotated counterclockwise through the expanding actuator 46 so that the pin 45 is rotated. , The push lever 47 is rotated counterclockwise, and the end surface 26a of the connecting rod 26 comes into contact with the fixed object of the circuit breaker main body 3 to stop the rotation. The operation pin 42 is pressed by the left edge of the push lever 47 and largely moves leftward in the groove 44e. As a result, the operation lever 38 is rotated clockwise, and the indicator 33 is set to “TES” as described later.
T "and" CONN. "
N. ", And the state shown in FIG. 7 is obtained. As described above, when the pull-out operation bolt 21 and the connecting rod 26 are screwed by a predetermined amount, the connection position can be reliably displayed.

In the disconnection position and the test position of such a drawer-type circuit breaker, as described in the section of the prior art, there is a corresponding position between the auxiliary circuit contact and the auxiliary circuit terminal or between the main circuit contact and the main circuit terminal. It is necessary to maintain the insulation distance of In particular, in the test position, if the breaker body is too close to the disconnection position, the auxiliary circuit contact will not reliably contact the auxiliary circuit terminal, and if it is too close to the connection position, the main circuit contact and main circuit terminal will Is limited from both sides of the disconnection position side and the connection position side such that the insulation distance of the connection is insufficient. Furthermore, in the operation of inserting the drawer-type circuit breaker, the operator needs to move the circuit breaker main body to a position satisfying the above-described condition while looking at the indicator 33 and the scale from a position several tens of centimeters apart. Requires a moderate width.

In order to explain the characteristics of the shape of the operation groove 44 considered in order to set the width of the scale as rationally as possible, the position of the breaker main body 3, the shape of the operation groove 44, and the indicator FIG. 8 shows the relationship between 33 and the position of the scale of the display window 32. In FIG. 8, in addition to the solid line (A) showing the relationship by the operation groove 44, the relationship when the groove is formed so that the indicator 33 moves at a uniform pace according to the amount of movement of the circuit breaker main body 3. Is indicated by a dashed line (B).

In FIG. 8, for example, in the case of the test position, when the width of the scale which is considered to be sufficient for the operator is set to ± W from the center position, when the insertion operation is performed so that the indicator 33 is located at the outermost position. In the case of the present embodiment shown by the solid line (A), the circuit breaker main body 3 is located at a position of approximately ± M from the center position of the test position, but when the operation groove for operating by the dashed line (B) is formed, The former is approximately ± N, and the former can move the circuit breaker body 3 to the test position at a position where there is no more variation than the latter, and the point of the insulation distance and the contact of the auxiliary circuit can be surely performed.

Next, the display operation when the circuit breaker main body 3 is moved to the connection position is different from the display operation at the test position. That is, the width of the scale cannot be made sufficiently large in the case of the operating groove which performs the operation shown by the dashed line (B). The reason is that when the operator sets the indicator to the "TEST" side (CT) of the scale width, the circuit breaker main body 3 is located at a position (C ') far before the correct connection position (C). The contact insertion distance between the circuit terminal 5 and the main circuit contact 11 is not sufficient, and in some cases, the position (C ′) before this point is such that the main circuit contact 11 is connected to the main circuit terminal 5 at the tapered portion 5a of the main circuit terminal. It may be the contact position. In this case, a sufficient contact pressure cannot be obtained, and the performance as a circuit breaker cannot be sufficiently exhibited.

On the other hand, in the case of the solid line (A) showing the case of the present embodiment, the indicator 33 is intermediate between "TEST" and "CONN." Until the breaker body 3 is substantially at the connection position. CONN. ”, And the operator recognizes that it is not at the connection position and continues operating the operation handle. Therefore, stop the breaker body just before the connection position as described above. There is no.
Immediately after the indicator 33 reaches the substantial connection position, the indicator 33 immediately moves to the “CONN.” Scale position.
During this operation, the indicator 3 is used until it moves at once.
The groove 44d is slightly angled to prevent the operator from illusion that the circuit breaker main body 3 may not be moving because the 3 does not move at all, and the indicator 33 is turned as shown by the two-dot chain line in FIG. You may make it move slightly.

Although not directly related to the present invention, the shutter plate 50 in FIG. 4 prevents the operator from inadvertently pulling out or inserting the circuit breaker body 3 and is provided with a spring (not shown). When the operation handle 27 is attached to the pull-out operation bolt 21, the operation handle 27 is pushed leftward at the slope end 50 a, and the operation handle 27 can be attached. At this time, when the switching contact of the circuit breaker body is in contact, the interlock plate 51 prevents the shutter plate 50 from moving, so that the pull-out or insertion operation cannot be performed. When the opening / closing contact is separated, the interlock plate 51 is retracted downward and can be operated. A hole 21d is formed in the pull-out operation bolt 21, and a pin 52 is held by a lever 53 so as to be freely fitted in the hole 21d. The lever 53 is urged clockwise by a spring (not shown). When the pull-out operation bolt 21 is rotated by vibration or the like in a state where the operation handle 27 is not attached, the lever 5 is automatically rotated.
2 is inserted into the hole 21d, so that the circuit breaker main body 3 is not inserted or pulled out unexpectedly.

[0031]

The present invention is embodied in the form described above, and the invention according to claims 1, 2 and 3 has a structure in which a male screw member and a female screw member are screwed in and inserted, and the disconnection position With a drawer-type circuit breaker that can move with a small operating force until the main circuit contact and the main circuit terminal come into contact with each other, even with a long moving distance until the main circuit contact comes into contact with the main circuit terminal, and until both reach the connection position. Since the reaching of the connection position is detected by the screwing amount of the male screw and the female screw, the reaching of the connection position can be mechanically and digitally displayed, and the circuit breaker body can be reliably moved to the connection position. For this reason, there is an effect that the current flowing through the electric circuit can be safely supplied. Furthermore, in the insertion operation, after a sufficient contact pressure is reached, there is no need to insert the circuit breaker body any more just for the purpose of securing the display margin, and the insertion stroke of the circuit breaker can be shortened. This also has the effect of reducing the size and the size of the switchboard and electrical room. According to the invention according to claim 4, since the variation in the position of the circuit breaker main body with respect to the unit scale width can be reduced, the width of the scale for moving the circuit breaker main body to a position that satisfies various performances of the circuit breaker can be increased. Has an effect that the moving operation is easy.

[Brief description of the drawings]

FIG. 1 is a side view illustrating an insertion operation of a drawer-type circuit breaker provided with an embodiment of a position display device according to the present invention,
It is a figure at the time of a circuit breaker main body being in a disconnection position.

FIG. 2 is a diagram corresponding to FIG. 1 when the circuit breaker main body is at a position immediately before a main circuit contact and a main circuit terminal thereof are in contact with each other.

FIG. 3 is a diagram corresponding to FIG. 1 when the circuit breaker main body is at a connection position.

FIG. 4 is a view showing an embodiment of the position display device according to the present invention, wherein the circuit breaker main body is at a disconnection position.

FIG. 5 is a diagram corresponding to FIG. 4 when the circuit breaker main body is at a test position.

FIG. 6 is a diagram corresponding to FIG. 4 when the circuit breaker main body has substantially reached a connection position.

FIG. 7 is a diagram corresponding to FIG. 4 when the insertion operation of the circuit breaker main body is completed.

FIG. 8 is a diagram illustrating the relationship between the position of the circuit breaker main body, the indicator, and the scale of the position display device according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drawer frame 3 breaker body 5, 6 main circuit terminal 7 auxiliary circuit terminal 8 auxiliary circuit terminal block 11 main circuit contact 12 main circuit contact spring 13 auxiliary circuit contact 14 auxiliary circuit contact block 21 extraction operation bolt 21 b Screw part 23 Pull-out operation shaft 25 Pull-out operation lever 25a Connection end 25b, 25c Notch 25d Application point 26 Connection rod 26a Female screw part 26b End face 27 Operation handle 29 Locking piece 30 Front cover 32 Display window 33 Indicator 35 Base plate 35b Guide projection 37 Operation plate 37a, 37b Slot 38 Operation lever 39 Operation lever 40 Indicator plate 40a Notch 41, 43, 45, 48 Pin 42 Operation pin 44 Operation groove 44a, 44b, 44c, 44d, 44e Groove 46 Expansion actuator 46a End 47 Pushle Over

Claims (4)

[Claims] 1. A drawer frame having a main circuit terminal, a circuit breaker main body having a main circuit contact that moves in and out of the main circuit terminal by moving in the drawer frame, the drawer frame and the circuit breaker body A drawer insertion mechanism for inserting the circuit breaker body by increasing the amount of screwing of the male screw member provided on one of the male screw members and the female screw member provided on the other, wherein the main circuit contact is the main circuit terminal And the insertion operation until the screwing amount of the male screw member and the female screw member with respect to the unit movement amount of the circuit breaker body from before and after the contact starts to the connection position where the insertion operation is completed reaches before and after the contact starts. A drawer-type circuit breaker comprising the drawer insertion mechanism that is larger than the amount of screwing of the male screw member and the female screw member with respect to the unit movement amount of the circuit breaker body,
A position display device that indicates that the circuit breaker body has reached a predetermined position by a display member that is displaced in accordance with the position of the circuit breaker body, wherein the display member is configured such that the circuit breaker body reaches a connection position. Until the circuit breaker body and the draw-out frame are displaced while detecting the relative moving distance, and when the circuit breaker body reaches the connection position, the screwing amount of the male screw member and the female screw member is a predetermined amount. A position indicating device for a drawer-type circuit breaker, which is displaced by an operation of a displacing member which displaces when the amount becomes an amount. 2. An engaging edge formed at an angle with a moving direction of the circuit breaker main body on an operation plate provided in a stationary state with respect to the movement of the circuit breaker main body, and a rotatably pivotally supported by the circuit breaker main body. Operating lever, an indicator provided on one arm of the operating lever, and an operating pin provided on the other arm of the operating lever and sliding on the engaging edge in accordance with the movement of the circuit breaker body. Until the circuit breaker body reaches the connection position in the insertion operation, the operation pin slides the engaging edge to rotate the operation lever, and the circuit breaker body is brought into the connection position, and the male screw member is provided. The position indicating device of a drawer-type circuit breaker according to claim 1, wherein the displacement member further rotates the operation lever when the female screw member is screwed in by the predetermined amount. 3. The operation enlarging lever interposed between the operation enlarging lever and the operation pin, wherein the displacement member rotates when the male screw member and the female screw member are screwed in by the predetermined amount. 3. The position display device for a drawer-type circuit breaker according to claim 2, wherein the push lever is a push lever that rotates following the rotation of the lever. 4. A drawer frame having a main circuit terminal and an auxiliary circuit terminal, and a main circuit contact and an auxiliary circuit contact that move in the drawer frame to contact and separate with the main circuit terminal and the auxiliary circuit terminal, respectively. A drawer-type circuit breaker comprising a circuit breaker body provided and a drawer insertion mechanism for moving the circuit breaker body, wherein the circuit breaker body reaches a predetermined position by a display member displaced according to the position of the circuit breaker body. The display member slides the engagement edge relative to an engagement edge member formed with an engagement edge having an angle intersecting a moving direction of the circuit breaker body. The engaging edge member and the sliding member are displaced by a moving sliding member, and one of the engaging edge member and the sliding member is provided so as to move together with the circuit breaker main body in the insertion operation and the other does not move. Breaker The crossing angle with the moving direction of the main body is formed so that when the circuit breaker main body moves at the predetermined position, it is larger than when moving before and after the predetermined position. Drawer-type circuit breaker position display device.