JPS60241622A - Circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a circuit breaker, and particularly to an improvement in its opening/closing mechanism.

[Prior art]

Conventionally, this type of circuit breaker has been constructed as shown in FIGS. 1 to 4. Figure 1 shows the OFF-like disease, and Figure 2 shows the OFF-like disease.
The figure shows the ON state, FIG. 8 shows the state at the moment of tripping, and FIG. 4 shows the state when the contacts are welded due to overcurrent. In the figure, 111ri is a base made of insulating material, (2) is a shaft (101) made up of a part of this base (11). One end of the torsion spring is hung on the base Ill and the other end is hung on the handle (2) to bias the handle (2) counterclockwise VC. (4) is formed in a U-shape. and one leg is attached to the inside 4 (go
The U bottle or link (5) is inserted into the hole (not shown) provided in the hole (not shown) in the above page (1).
0 rotatably pivoted by @I6) supported on 1
First and second latch surfaces (5a) ('1)) that form a pair at one rotating end of the Tljh element.kRL Til o f7
) is a locking lever rotatably supported on the movable element (5) by the above-mentioned 1111 (6), and the movable element is A locking portion (7a) that is always biased in the opposite direction to the biasing direction of (5) and that normally clamps the other end of the U-pin (4) together with both the latch surfaces (5a) and (5b). are doing.

(1 is a shaft attached to the above-mentioned mover (6), 9'4 is a movable contact fixed to -4 group of the above-mentioned q mover (6), and 1 is attached to the above-mentioned base Il+. The axis, the wall is this sho
1 and a tension spring stretched over the shaft (i+), +I- a stator fixed to the base 11+, and 轡 a fixed contact fixed to the stator 9 so as to face the movable contact 04. , 9η is a coil whose one end is electrically connected to the stator OC++, and 4 is an electrical VC connected to this coil aη.
A yoke that is housed in the base Ill and forms a magnetic path;
121 is VCI in the left direction in the figure against the spring force of the push spring when the coil 0η is energized! The plunger (to) drawn by the coil gη has a winding of 11tyX, and the plunger Q is fitted into the hollow part of the cylinder. (
(to) is a rond that is driven to the left when the plunger (to) is sucked, and (4) is one end of which is the movable element (5).
The flexible copper stranded wire is electrically connected to the bimetallic flexible copper stranded wire, the other end of which is electrically connected to VC. (to the presser foot) and an external conductor (not shown) via a screw thread. 94 is al#! which is hinged to the above terminal (b). Screw, ffj is an insulating tube attached to the above bimetal..., so is an arc runner whose one end is fixed to the terminal eη, and the other end is fitted into the groove of the above pace Ill, @ is an arc runner on both sides of the above arc runner so A side plate made of inorganic material arranged parallel to the running direction of the It is supported by a pair of side plates so as to be spaced apart from each other.

Next, the operation of the conventional circuit breaker will be explained.

That is, if the circuit breaker shown in FIG.
In either case of the ON state of the circuit breaker shown in the IJg diagram, the σ pin +4] is connected to both latch surfaces (5JL) of the mover (5).
(51)) and the locking portion (7a) of the locking lever (7). When the handle (2) is turned clockwise (ON operation) from the 0FIF pattern of the circuit breaker shown in Figure 1,
Inside of handle (2) 4 (2101) Jumping bottle (4)
The toggle link mechanism formed by and extends beyond the dead point, the mover (6) rotates counterclockwise around the entire center of the shaft (6), the movable contact Ono comes into contact with the fixed contact tilt, and 91I
It is in the ON state shown in the z diagram.

When the handle (2) is rotated to the left (0IPIF operation), the toggle link mechanism formed by the inner end (201) of the handle 121 and the σ pin (4) bends beyond the dead point, and the orJJ child (5) rotates clockwise about the axis, elk, and the off contact 94 is separated from the fixed contact 9, resulting in the OFF state shown in FIG. Next, if a relatively small overflow occurs in an overload region, etc., bimetallic...
is curved by its own Joule heating and becomes a bimetal)
The light type is the pause lever (17) * Press the pause lever (
7) rotates clockwise around -1 6), and the U pin (4)
) The other end of the clamp is completely released, and the pull is 0 due to the biasing force of
The J lock (61) rotates clockwise around 1 (6), and the movable contact is separated from the fixed contact, resulting in an instantaneous trip situation as shown in Figure 8. (3
) The handle (2) rotates counterclockwise due to the urging force of
and the retaining part (7a), the U pin (4) is held between the latch surfaces (5a) and (5b) and the lock 5 (71!L), and the OFF position shown in FIG. The condition will be the same. It is automatically reset. Note that the above-mentioned trip is performed with a time delay characteristic. On the other hand, when a large overcurrent such as a short circuit current flows, the coil Qη is excited, the plunger armor is attracted against the urging force of the push spring (to), the rod 2 is pushed out, and the locking lever (7) rotates clockwise around 1III161, and the σ pin (4
) Release the clamp at the other end ◎After that, the same operation as in the case of overload wL flow will occur and trip. In addition,
This trip is instantaneous in nature. However,
When both contacts tI''zI are welded for some reason and the above-mentioned overload release is performed, release the grip on the other end of the lever (4) and turn the handle (2) counterclockwise. The inner end (80
The toggle link mechanism formed by 1) and the σ bottle (4) bends beyond the dead point from the extended state, and the locking lever (7) is rotated clockwise, as shown in Fig. 4. The handle (2) is in the same state as the OFF position.

Also, with both contacts u2 and j4 starting to weld, the handle (2)
Similarly, when the 0FIF operation is performed by Locking lever (7) is turned clockwise 10
The handle (z) is rotated and the handle (z) is turned as shown in Figure 4.
The state will be the same as the F position. In this way, in the conventional circuit breaker, even if both contacts t121 (11) are welded together, the handle (2) is in the same position as OFF', and although it may look loose from the outside, the breaker is (Contacts are open.) Therefore, there was a risk of serious accidents such as m* occurring during maintenance and inspection of the circuit.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and when the contact is welded and excessive ft is removed or the OFF operation is performed, the link's young tl! An object of the present invention is to provide a circuit breaker capable of displaying contact welding at the handle position by providing a stopper on the movable element.

[Embodiments of the invention]

Hereinafter, one embodiment of this invention will be explained with reference to the drawings. Fifth
6 and 6 show an embodiment of the present invention, FIG. 6 is a side sectional view showing the contact welding display shape m, and FIG. 6 is an exploded perspective view showing the main parts thereof. In the figure,
(5c) is a stopper disposed facing the second latch surface (5b) and provided on the movable element (5), which helps the U-bin (4) when both the contacts Da 111 are welded. It completely prevents it.

Next, the present invention will be explained in detail. That is, Nondol (2
) ON operation, 0FII' operation, or when the circuit breaker trips due to excessive water flow, the circuit breaker operates in the same way as the conventional one. Next, for some reason both contacts u21 (IQ) are stuck,
If an over-st current exceeding the rated current flows to the circuit breaker, either the Ronde or the bimetal will operate, and the locking collar (7) will stop the clock around the shaft (6). direction to release the other end of the U-bin (4). Therefore 7
・The toggle link mechanism formed by the inner end (511) of the 7 dollar ill and the jump pin (4) bends beyond the dead point from the extended state, and the handle (2), σ is bent by the biasing force of the torsion spring (3). The locking Renocou+71 tries to rotate clockwise through the pin (4), but the U pin (4)
Since the other end touches the stopper (5C), the 0-bin (
4) is prevented, and as shown in the fifth example, the handle (2) is in the intermediate position between the ON and 0IFF' states.

In addition, both contacts IQ welded state handle (2) is 0FI
Even if F is operated, the movement of the σ pin (4) is similarly blocked and the handle 12) remains at an intermediate position between ON and OFF.

In this way, with the contacts welded, 1lllitIL trips or riOF'? When the operation is performed, the handle (2) position of the present invention is at an intermediate position between ON and 0FIP-shaped base, so that it is possible to clearly distinguish between the ON and OFF states of the circuit breaker. It is possible.

In addition, in the above embodiment, a U-shaped σ pin (4) is provided as the link (4), but it may have a shape other than the U pin, and it may be similar to the above embodiment. It has the following effects.

In the above embodiment, the stopper (5C) is shown as being disposed facing the second latch face (5b), but it does not have to face the eighth latch face (5b). This provides the same effect as the above-mentioned example.

〔Effect of the invention〕

As described above, according to the present invention, when the contacts are welded,
By providing a stopper on the movable element to prevent the link from turning when tripped or OFF' operation is performed, contact welding can be indicated at the handle position, thereby preventing serious accidents. What is the effect of preventing this?

[Brief explanation of drawings]

Figures 1 to 4 all show a leveraged circuit breaker; Figure 1 is a top view showing its OFF state, Figure 2 is a bisectional view of its ON state, and Figure 3 is a new view of 1llJ showing the state of the tripped interrogation, No. 11.
is a side sectional view showing the state when the contacts are welded due to overcurrent. ◎Figures 5 and 6 both show an embodiment of the present invention, and Figure 5 shows the state when the contacts are welded. FIG. 6 is a sub-sectional view showing the display state WAr, and an exploded perspective view showing the main parts thereof. In the figure, Il+ is the housing, (2] is the operating handle, (4j is the link, ([+) is the mover, (5c) is the stopper, (
7) is a locking lever, 04 is a possible '#J contact, tUS is a fixed sending point, Qη is a coil, A is a plunger, and (to) is a rond. In the drawings, the same reference numerals ri and -C or equivalent parts are indicated. Agent Masuo Odai

Claims (1)

[Claims] 111 An operation handle that can be turned on and off from outside the device, one end of which is rotatably connected to the operation handle,
A link that forms a toggle link mechanism together with the operating handle, is rotatably supported and has a movable contact placed opposite the fixed contact at one rotating end, and the other rotating end is connected to the link. llrJJ that is always connected to the link and interlocks with the link so that the movable contact contacts and separates from the fixed contact.
g II element, a st flow tripping device that disconnects the link and the movable element to separate the 0J# contact from the 1 reverse contact when an overflow of a predetermined value or more flows; and the movable element. The overcurrent is tripped when both contacts are welded, or the OFI +'
A circuit breaker comprising a stopper that prevents movement of the link so that the operating handle is at an intermediate position between the ON and OFF states when an operation is performed.