JP3142502B2 - Circuit breaker contact switching display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker contact opening / closing display device capable of accurately checking the open / closed state of a movable contact of a circuit breaker from the outside.

[0002]

2. Description of the Related Art In a conventional circuit breaker, the on / off position of a handle for opening / closing a movable contact is visually checked to determine the open / closed state of the movable contact.

[0003]

However, if the movable contact is welded to the fixed contact even if the handle is returned to the off position by the shut-off device during an overload or short circuit, the disconnection will not occur. For this reason, in the conventional circuit breaker, it is considered that the movable contact is welded and the handle is in the OFF state, but the handle is in the OFF position, and the load is disconnected. There is a danger, and to prevent this, it is necessary to check the energized state with a tester one by one, and the work efficiency is poor. The present invention has been made to solve such a problem, and to provide a contact switching display device for a circuit breaker in which the open / close state of the movable contact can be accurately visually observed even when the movable contact is welded. It was done.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a circuit breaker for displaying the open / closed state of a movable contact with a detection mechanism for mechanically detecting the movement of the movable contact . Contact opening and closing display device,
The structure is pivotally supported in the circuit breaker case and the crossbar
The display unit provided at the upper end of the display lever that swings in conjunction with
A window facing through the upper plate of the circuit breaker case
And the lower part of the display lever is formed in a vertical hole.
And the upper part is formed in a slanted hole.
Slide the guide protrusion protruding from the crossbar into the curved cam hole.
It is characterized in that it is fitted at the moment . Thereby, when the movable contact is welded and the contact is closed, it can be visually observed from the outside that the movable contact is in a closed state even if the handle indicates the off position.

[0005]

Embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show a preferred embodiment of the present onset bright, FIG. 1 is normal on state, FIG. 2 is a normal OFF state and the trip state, Fig 3 is welded to the fixed contact the movable contact FIG. 4 shows the display lever and the crossbar when only the handle is turned off by the blocking device.

In FIGS. 1, 2, and 3, reference numeral 1 denotes a fixed contact, 2 denotes a movable contact that comes into contact with and separates from the fixed contact 1, and 3 denotes a crossbar that moves up and down in conjunction with the movable contact 2. The crossbar 3 is pushed upward by the movable contact 2 which is opened in the normal off state shown in FIG. The movable contact 2 itself has a spring property.
As a device that always urges in the opening direction
But between the bottom of the circuit breaker case 4 and the bottom plate 5
It may be biased in the separating direction with a spring interposed .
No. Reference numeral 7 denotes a handle that is turned on and off, and the handle 7 is a metal plate frame 8 fixed in the case 4.
It is pivoted on.

[0007] 9 is a chestnut links that pivoted the horizontal pressure plate 10 by a pin 11 to the lower end as well as pivotally with the upper end to the lower of the handle 7, the link 9 the handle 7 is a state of ON When removing, as shown in FIG.
The horizontal pressing plate 10 is lowered downward under the guide of the guide notch 8 a provided in the frame 8, and the cross bar 3 is pressed down by the horizontal pressing plate 10, and the movable contact 2 is pressed down by the cross bar 3. The fixed contact 1 is brought into contact. When the handle 7 is in the off state, the link 9 raises the horizontal pressing plate 10 upward as shown in FIG.
To release the depression of the cross bar 3, the movable contact 2 to be be separated to open is pushed upward.

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

Reference numeral 12 denotes opening and closing of the movable contact 2
It is a detection mechanism that mechanically detects and displays the movement of
The detection mechanism section 12 has a display section 16 at the upper end and a vertical plate section 17b stretched on the distal end side.
8a, a display lever 17 having a cam hole 18 bent in a substantially rectangular shape having an upper portion formed in an inclined hole portion 18b, and a support shaft 17a provided at a lower base end of the display lever 17 are provided. The case 4 of the circuit breaker, i.e., a shaft supported by a shaft hole provided in the partition plate 4a, protrudes from a side surface of a vertical rod portion 3b erected at the upper end of a cross bar 3 vertically moving in conjunction with the movable contact 2. The guide protrusion 19 provided is slidably fitted in the cam hole 18, and the crossbar 3 is moved up and down to display lever 1.
7 is swung, and the closed display unit 1 of the display unit 16 is inserted into a window hole 14 provided in the upper plate 13 of the case 4 of the circuit breaker.
6a (for example, red display) or the open display section 16b (for example, green display). If a stopper 20 is provided in the horizontal direction at the tip of the guide projection 19, the display lever 17 is inclined so that the vertical hole 18a is horizontal, and the guide lever 19 of the crossbar 3 is tilted. After assembling by fitting through the stopper 20, the display lever 17
Does not come off the guide projection 19 of the crossbar 3.

Therefore, in the normal ON state shown in FIG. 1 , when the handle 7 is in the ON state and the movable contact 2 is pressed down by the crossbar 3 and is closed, the crossbar 3 is located at a lower position. Accordingly, the guide projection 19 slidably fitted in the cam hole 18 is located below the vertical hole 18a below the cam hole 18 and the display lever 17 is provided.
Swings the closed display section 16a (for example, red display) of the display section 16 to a position facing the window hole 15 with the support shaft 17a as a fulcrum, and it can be visually confirmed that the movable contact 2 is closed. It can be confirmed exactly.

In the normal off state or trip state shown in FIG. 2 , the handle 7 is in the off state and the movable contact 2 is separated by the elastic force of its own spring, and the cross bar 3 is moved upward. As a result, the guide projection 19 reaches the inclined hole 18b above the cam hole 18 and the inclined hole 1
8b is regulated in the vertical direction.
Reference numeral 7 denotes a window hole in which the display section 16 at the upper end swings about the support shaft 17a and the open display section 16b (for example, green display) is provided through the upper plate section 13 of the case 4 of the circuit breaker. Since it swings to the position facing 14, it is possible to accurately confirm that the movable contact 2 is open by visually observing the swing. Since the lower portion of the cam hole 18 is formed in the vertical hole portion 18a, the guide projection 19 can move upward in the vertical hole portion 18a without resistance when an overcurrent flows to the shutoff device and the trip state is taken. Accordingly, the upward movement of the crossbar 3 from the initial state can be performed smoothly, and the movable contact 2 can be accurately opened without taking energy for swinging the display unit 16. Note that the shut-off device is
The trigger lever 21 is moved by the immetal 22,
The water locked on the central step of the trigger lever 21
Thermodynamic type that operates when the base end of the flat pressing plate 10 comes off
, But instead of bimetal 22, an electromagnet device
It is good also as an electromagnet type using.

The movable contact 2 shown in FIG.
When only the handle 7 is in the off state by the blocking device after welding, the link 9 lifts the horizontal pressing plate 10 upward to release the crossbar 3 from being pushed down, but the crossbar 3 is provided at the lower end. The guide projection 19 is inserted into the vertical hole 18 a of the cam hole 18 while the locking portion 3 a is locked to the lower surface of the movable contact 2, is prevented from moving upward in conjunction with the movable contact 2, and remains at the lower position. Since the closed position 16a (for example, red display) of the display unit 16 of the display lever 17 is still oscillating to the position facing the window hole 15, the handle 7 can be visually checked to make the handle 7 visible. Even in the off state, it can be accurately confirmed that the movable contact 2 is closed.

[0023]

According to the present invention, as is apparent from the above description, the opening and closing of the movable contact can be mechanically detected and visually confirmed from the outside, so that the handle can be accurately checked even if the movable contact is welded. It is considered that the switch is disconnected by indicating the OFF position, and there is no danger of accidentally touching the load terminal and causing an accident . Further, since the opening and closing of the movable contact can be confirmed even when the movable contact is interrupted by the main circuit breaker, it is possible to prevent in advance that the movable contact is welded and to prevent re-energization in advance. Therefore, the present invention greatly contributes to the industry as a solution to the problem of the conventional circuit breaker.

[Brief description of the drawings]

FIG. 1 is a normal on state of a preferred embodiment of the present invention .
(A) is a partially cutaway front view showing the whole,
(B) is a front view of the main part.

FIG. 2 shows a normal off and a preferred embodiment of the present invention .
This indicates the trip status.
(B) is a front view of a main part.

FIG. 3 shows a fixed movable contact according to a preferred embodiment of the present invention .
Only the handle shows the off state by welding to the contact point,
(A) is a partially cutaway front view showing the whole, and (B) is the main part
FIG.

FIG. 4 is a diagram showing a display used in a preferred embodiment of the present invention .
It is a perspective view showing a bar and a crossbar.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fixed contact 2 Movable contact 3 Crossbar 4 Circuit breaker case, 12 Detection mechanism part 14 Upper plate part 15 Window hole 16 Display part 17 Display lever 18 Cam hole 18a Vertical hole part 18b Inclined hole part 19 Guide projection 20 Stopper

Continuation of the front page (72) Inventor Yuji Oike 13-3, Asamaokaokamachiyama, Owariasahi-shi, Aichi Prefecture (72) Inventor Fumio Nishida 3-157 Ogi, Komaki-shi, Aichi Prefecture (JP, A) JP-A-4-230930 (JP, A) JP-A-58-41564 (JP, U) JP-A-5-34646 (JP, U) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) H01H 73/12

Claims (1)

(57) [Claims] A contact switching display for a circuit breaker for displaying the open / closed state of a movable contact (2) with a detection mechanism (12) for mechanically detecting the movement of the movable contact (2).
Install the detection mechanism (12) in the circuit breaker case (4).
Display lever (17) that swings in conjunction with the crossbar (3)
The display (16) provided at the upper end of the circuit breaker case (4)
It faces the window hole (15) provided through the upper plate (14), and
The lower part of the indicator lever (17) is formed in the vertical hole (18a).
A substantially rectangular shape with the upper part formed in the inclined hole (18b)
Guide that protrudes from the crossbar (3) into the cam hole (18) that is bent
A contact opening / closing display device for a circuit breaker, characterized in that the projection (19) is slidably fitted .