JPH10283895A - Opening/closing displaying apparatus of circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably display the opening or closing state, provide further high safety, make no need of unnecessarily high precision such as machining precision, and compose an economical circuit by forming an aperture part in a cover and providing a displaying member which is made of an elastic member joined to a switchgear mechanism and rotated corresponding to operation of the mechanism, an opening and closing display, and an engaging part. SOLUTION: A display member 2 is made of an elastic member and held in a frame 1 in a freely rotatable manner and comprises a display part 2a having opening and closing display at the top and bottom on the tip end part and a window frame-like engaging part 2b formed adjacently to the display part 2a. An aperture part 4a is formed in the cover 4. When a contact closing instruction is transmitted, the mechanism part 5 moves in the left direction and the display member 2 is rotated and the lower end of the window frame of the engaging part 2b is brought into contact with an engaging member 3. Consequently, the closing display of the display part 2a is conformed to the position of the aperture part 4a and even if the mechanism part 5 moves in the left direction, a display arm 2c is wrapped and the display part 2a scarcely moves and thus the display through the aperture part 4a is scarcely affected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical switching display for a circuit breaker.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of an opening and closing mechanism of a contact of a circuit breaker disclosed in Japanese Patent Application Laid-Open No. 61-39427. FIG. 3 is a side view showing the entire circuit breaker in a “closed” state where the fixed contact 10 and the movable contact 11 are in contact, and FIG. 4 is a partial side view showing the “open” state in which they are separated. FIG.

In FIG. 3, a movable contact 12 having a movable contact 11 is held by a contact holder 29 rotatably held by a shaft 28 via a shaft 13. Contact holder 2
Reference numeral 9 is connected to a rotatable cross bar 16 via an insulating rod 14 and an operation lever 15. The insulating rod 14 and the operating lever 15 are connected by a shaft 17 and the shaft 1
A latch 21 rotatably supported by a link 7 via a link 19 and a link 20 is connected to 7. The latch 21 is urged clockwise by a blocking spring 18 that urges the shaft 17 substantially downward, and the urging is held by a latch roller 23 provided on a latch plate 22.

An open command for a contact is applied to the circuit breaker. Although not described in detail, when the latch plate 22 rotates clockwise, the engagement between the latch 21 and the latch roller 23 is released, and the latch 21 is turned clockwise. And the link 20, the link 19 and the shaft 17 move downward. As a result, the contact holder 29 rotates counterclockwise with the movable contact 12 via the insulating rod 14, and the fixed contact 10 and the movable contact 11 are separated from each other. At this time, the operation lever 15 also rotates clockwise. This state is shown in FIG.

[0005] The open / close display device for the contacts of the circuit breaker is as follows.
A metallic display lever 25 having a "closed" display 25a and an "open" display 25b is provided at the tip thereof while being rotatably supported by a shaft 24. This display lever 25
Is connected to the operation lever 15 via a link 26. The circuit breaker is provided with a front cover 27 that covers the open / close display device and the open / close mechanism, and the cover 27 has an opening 27a.

In such a conventional open / close display device, when the contact is in the "closed" state, as shown in FIG. 3, the "closed" display 25a is located at a position visible from the surface of the cover 27 through the opening 27a. , The display lever 25 is stopped. And
When the contact is in the "open" state, the operation lever 1 is turned on as shown in FIG.
5 rotates, the display lever 25 rotates clockwise through the link 26, and displays "open" 2 through the opening 27a.
5b can be visually observed.

[0007]

As described above, the open / close display device for a circuit breaker operates by interlocking a number of components. However, in this conventional open / close display device for a circuit breaker, the display lever 25 is used. However, manufacturing errors of a large number of parts may be accumulated and the stop position may not be constant. Therefore, there has been a problem that the display lever 25 may stop at a position where the indication of "open" or "closed" cannot be visually confirmed from the position of the opening 27a.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a circuit breaker in which an opening / closing mechanism for opening / closing a contact is covered with a cover, an opening is formed in the cover, and the opening / closing mechanism is provided in the circuit breaker. A display member formed of an elastic member that is connected and rotated in accordance with the operation thereof; an open / closed display provided at the tip of the display member and visible from outside the cover opening; and a display immediately before the operation of the opening / closing mechanism is completed. A locking member for locking the member at a portion adjacent to the tip thereof.

With such a structure, when the display member is further rotated and urged after coming into contact with the locking member by the operation of the opening / closing mechanism, the display member is bent, and the extra rotation is absorbed. . Even if such a flexure occurs, the locking member locks the display means at a portion adjacent to the leading end with the indication of open and closed, so that the indication of open and closed hardly moves.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to an example. FIG. 1 and FIG. 2 are side views showing the on / off display of the circuit breaker with the contacts being "closed" and "open", respectively.

The frame 1 is a fixing member for holding a contact opening / closing mechanism of the circuit breaker. The frame 1 is provided with a display member 2, a pin-shaped locking member 3, and a cover 4.

The display member 2 is an elastic member such as a thermoplastic synthetic resin, is rotatably held by the frame 1, and has a display portion 2a having "open" and "closed" indications at the top and bottom thereof. A window frame-shaped locking portion 2b formed adjacent to the display portion 2a; a display arm 2c formed thin in the rotation direction between the locking portion 2b and the rotation center of the display member 2; 2
d. A locking member 3 is inserted into a window frame of the locking portion 2b, and a mechanism component 5 connected to an opening / closing mechanism and moving substantially in the left-right direction according to the opening / closing state of the mechanism connecting arm 2d. Are linked. (Note that, in the description of this embodiment, the opening and closing mechanism of the circuit breaker is not a main part of the present invention, so the drawing and its description are omitted.) The cover 4 has an opening 4a formed therein. A transparent plate 6 is fitted into the portion 4a.

Next, the operation of the open / close display device will be described.

When a contact closing command is issued from the state of the display device when the contact is open as shown in FIG. 2 and the opening / closing mechanism is operated, the mechanical component 5 moves to the left and the display member 2 rotates the clock. Rotate in the direction. Then, immediately before the closing operation is completed, the lower end of the window frame of the locking portion 2 b contacts the locking member 3. This state is shown in FIG. 1, and the indication of "closed" on the display unit 2a matches the position of the opening 4a. Further, when the mechanical component 5 moves to the left until the closing operation is completed, the portion of the locking portion 2b hardly moves, so that the portion of the display arm 2c bends.
However, since the locking portion 2b and the display portion 2a are adjacent to each other, the display portion 2a hardly moves, so that there is no effect on the visual observation of the "closed" display from the opening 4a.

When the opening / closing mechanism starts the opening operation in response to the opening command of the contact from the state of FIG. 1, the mechanical component 5 moves rightward and the display member 2 rotates counterclockwise, as shown in FIG. Immediately before the completion of the opening operation, the upper end portion of the window frame of the locking portion 2b comes into contact with the locking member 3. In this state, the indication of "open" on the display unit 2a matches the position of the opening 4a. When the mechanism component 5 further moves until the opening operation is completed, the display arm 2
“c” is bent, but “open” of the display unit 2a is performed similarly to the above-described closing operation.
Can be surely viewed from the opening 4a.

Therefore, when the locking means 3 and the locking portion 2b come into contact with each other, the indication of "open" and "close" can be reliably viewed from the opening 4a. The relative positions of the stopper 2b with respect to the upper and lower ends of the window frame are determined, and even before the closing operation and the opening operation are completed, the lower end and the upper end of the window frame of the locking portion 2b may even contact the locking means 3. With this, even if the moving distance of the mechanical component 5 varies due to an error in the component dimensions of the opening / closing mechanism, the display can be accurately viewed.

In this embodiment, the display arm 2c is formed so as to be thin in the rotational direction and is bent, but the mechanism connecting arm may be formed so as to be thin and bent. Further, the display member 2 is not limited to a synthetic resin, but may be a member using a metal leaf spring in a bent portion.

[0018]

The present invention is embodied in the form as described above, and enables reliable opening / closing display even if manufacturing errors of a large number of parts of the contact opening / closing mechanism are accumulated, thereby achieving higher safety. Can be secured. Furthermore, there is no need to increase the processing accuracy and assembly accuracy of the opening / closing mechanism components for accurately performing the opening / closing display beyond the accuracy required to satisfy the switching / breaking performance originally required of the circuit breaker, There is also an effect that an economical circuit breaker can be provided.

[Brief description of the drawings]

FIG. 1 is a side view of a circuit breaker switching display apparatus according to an embodiment of the present invention in a closed state.

FIG. 2 is a side view in an open state of FIG. 1;

FIG. 3 is a side view of a conventional circuit breaker in a closed state.

FIG. 4 is a partial view in an open state of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 1 2 Display member 2a Display part 2b Lock part 2c Display arm 2d Mechanism connection arm 3 Lock member 4 Cover 4a Opening 5 Mechanical part 6 Transparent plate

Claims (1)

[Claims] 1. An opening / closing display device for a circuit breaker in which an opening / closing mechanism for opening / closing a contact is covered by a cover, wherein the opening / closing mechanism is connected to the opening / closing mechanism and rotates according to the operation thereof. A display member made of an elastic member, an open / closed indication provided at the tip of the display member and visible from outside the opening of the cover, and the display member attached to the tip just before the completion of the operation of the opening / closing mechanism. An opening / closing display device for a circuit breaker, comprising: a locking member that locks at an adjacent portion.