JPH062187Y2 - Circuit breaker - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a circuit breaker, in particular, an engagement between a trip bar portion and a latch.

[Conventional technology]

7 to 10 are views showing a conventional circuit breaker disclosed, for example, in Japanese Utility Model Laid-Open No. 48-42070, FIG. 7 is a side sectional view showing an ON state, and FIG. 8 shows an OFF state. FIG. 9 is a partial cross-sectional side view showing the same, FIG. 9 is an enlarged view of an essential part of FIG. 8, and FIG. 10 is a partial cross-sectional side view showing a trip state. In the figure, (1) is an overcurrent responding device, which includes an electromagnetic coil (2) and a yoke.
(3), a movable iron piece (4), a tension spring (5) for constantly urging the movable iron piece (4) toward the anti-electromagnetic coil side, and the like, and the tension spring ( The movable iron piece (4) is attracted to the electromagnetic coil (2) side against the biasing force of (5). (6) is a trip bar portion, which is composed of a trip bar (7) and a trip bar holding metal (8) which is inserted into the hole (8a) by caulking, and which includes a support shaft (9 ), And is constantly urged by a twist spring (not shown) in the direction of arrow (C) (see FIG. 7). (10) is a latch, which is rotatably supported by a support shaft (19), and when the circuit is turned on, its top portion abuts against the trip bar holding metal (8) to rotate counterclockwise. It is suppressed. Reference numeral (11) is a link mechanism portion, and lower ends thereof are toggle links (20) and (21) rotatably connected to the movable contactor (12), and a part thereof is rotated to an upper end of the toggle link (21). Lever (11
a) and the like. Then, the lever (11
a) is locked in the notch (A) of the latch (10). (12) is a movable contactor, (13) is a rotating shaft of the movable contactor (12), (14) is a fixed contactor, (15) is a handle, and (23) is this handle (15) on the top. The fixed operation lever is configured to be rotatable around its lower part. Reference numeral (22) is a tension spring provided at the top of the operating lever (23) and the interconnection between the toggle links (20) and (21). Reference numeral (16) is a pusher, and a wire having elasticity such as a piano wire is attached to the movable contactor (1).
It is installed on the rotating shaft (13) of 2). And
When the movable contact (12) is opened, the tip of the pusher (16) pushes the trip bar (7) to the left in the figures as shown in FIGS. 8, 9 and 10 and turns it. It is formed to prevent movement. Also, (17) is a terminal device,
(18) is a molded case.

Next, the operation of the main part of the circuit breaker configured as described above will be described.

First, considering the case where an overload current flows in the circuit, the movable iron piece (4) is attracted to the electromagnetic coil (2) side, the trip bar (7) is pushed by the tip of the movable iron piece (4), and the trip bar Holding money
(8) rotates in the direction of arrow (B) in FIG. As a result, the top of the latch (10) is disengaged from the trip bar holding member (8), and the latch (10) rotates counterclockwise. Then, the lever (11a) is disengaged from the (A) portion of the latch (10), so that the lever (11a) rotates clockwise and the toggle link (20),
(21) is collapsed and the movable contact (12) is opened by the pulling force of the tension spring (22). This is a so-called normal trip operation.

Next, considering the case where the movable contactor (12) is opened by operating the handle (15), when the handle (15) is moved from the on position in FIG. 7 to the off position in FIG. 8, a tension spring ( The action line of (22) changes and toggle links (20), (2
Disintegrate 1). Then, the movable contact (12) is pulled up by the toggle link (20) and separated from the fixed contact (14).

[Problems to be solved by the invention]

In the conventional circuit breaker as described above, when tripping, the movable iron piece (4) disengages from the trip bar (7) and the trip bar holding metal (8) which are rotated in the direction of the arrow (24) in FIG. The latch (1) that rotates in the direction of the arrow (25) in FIG.
0) collides with the trip bar due to this impact force.
Looseness of sticking due to caulking in (7), trip bar (6)
There was a problem that was damaged.

This invention was made in order to solve such a problem, and before the trip bar hits the latch, a part of the trip bar holding gold is applied to the latch and the impact of the trip bar due to the collision with the latch. An object of the present invention is to obtain a highly reliable circuit breaker capable of preventing damage to the trip bar portion by relaxing the force.

[Means for solving problems]

The circuit breaker according to the present invention is such that the trip bar contacts the latch after a part of the trip bar holding metal hits the latch when tripping.

[Action]

In this invention, since the trip bar hits the latch after a part of the trip bar retainer hits the latch at the time of trip, the impact force with the latch can be absorbed by the trip bar retainer hit first. . For this reason, the impact force between the trip bar and the latch that hits next is alleviated.

[Example of device]

An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a side sectional view showing an ON state, FIG. 2 is a side view of an essential part of FIG. 1, and FIG. 3 is the same view as FIG. 2 showing a state where a trip bar holding metal hits a latch. FIG. 4 is the same view as FIG. 2 showing the trip bar portion overrun, FIG. 5 is the same view as FIG. 2 showing the trip state, and FIG. 6 is the disassembly of the trip bar portion and the latch. Is a perspective view,
The same or corresponding parts as those of the conventional device are designated by the same reference numerals, and the description thereof will be omitted. In the figure, (26) is a latch (1
(0) is a part of the slope formed by bending, (27) is a corner part that forms the end of the trip bar retainer (8), (2)
Reference numeral 8) is a torsion spring for constantly urging the trip bar portion (6) in the direction of arrow (C), and (29) is a torsion spring for constantly urging the latch (10) in the direction of arrow (25). .

In the ON state shown in FIGS. 1 and 2, the movable iron piece (4) is attracted to the electromagnetic coil (2) side by the overcurrent flowing in the circuit, and the movable iron piece (4) is the tip and the trip bar (7) is When pushed in the direction of the arrow (24), the trip bar retainer (8) rotates in the direction of the arrow (24) against the torsion spring (28) about the support shaft (9) as a fulcrum, and the corner portion thereof. As shown in Fig. 3, (27) is disengaged from the trip bar holding gold (8) and the torsion spring (2
9) It collides with the slope (26) of the latch (10) which rotates. Continue to hold the trip bar retainer (8) with the lever (1
4a because it is pushed in the direction of the arrow (24) by 1a).
As shown in the figure, the trip bar (7) and the latch (10) collide. Then, the trip bar holding gold (8) overruns as shown in FIG. 4 and then returns by the twist spring (28) to be in a trip state as shown in FIG. In this trip state, the trip bar (7) engages with the latch (10) with the corner (27) of the trip bar retainer (8) riding on the slope (26), and at the same time, the trip bar retainer ( Lever (11a) where 8) is located at top dead center
To be locked.

As shown in FIG. 3, the corner portion (27) of the trip bar retainer (8) collides with the slope (26) of the latch (10), so that the impact force is generated by the collision with the latch (10). Since it can be absorbed, the impact force at the time when the trip bar (7) and the latch (10) collide is alleviated as shown in FIG.

In the above embodiment, as shown in FIG. 4, the trip bar portion (6)
Since the corner part (27) of the trip bar holding gold (8) does not hit the latch (10) when the overrun occurs, the latch (10) is overrun on the trip bar (6). It is not pushed by, and unnecessary rotation of the latch (10) can be prevented, and the twist spring (29) can be downsized,
The space can be used.

[Effects of the Invention] As described above, according to the present invention, a part of the trip bar holding gold is applied to the latch before the trip bar hits the latch, and the impact force of the trip bar due to the collision with the latch. By mitigating the above, there is an effect that damage to the trip bar portion can be prevented and high reliability can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a side view of an essential part of FIG. 1, and FIG. 3 is a view showing a state in which a trip bar holding member has hit a latch, FIG. 4 is a view showing a state where the trip bar portion is overrun, FIG. 5 is a view showing a trip state, FIG. 6 is an exploded perspective view of the trip bar portion and the latch, and FIG. 8 is a side sectional view showing a state, FIG. 8 is a partial sectional side view showing an off state, FIG. 9 is an enlarged view of an essential part of FIG. 8, and FIG. 10 is a partial sectional side view showing a trip state. In the figure, (1) is the response device, (6) is the trip bar section,
(8) is a trip bar holding metal, (9) is a support shaft, (10) is a latch, (11) is a link mechanism, (12) is a movable contact,
(15) is a handle, (26) is a slope, and (27) is a corner. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] Claim: What is claimed is: 1. A response device that operates when an overcurrent exceeding a predetermined level is detected, a trip bar and a trip bar holding member fixed to the trip bar, and the trip bar holding member is rotated by a spindle. A trip bar portion that is movably supported and rotates by the operation of the response device; a latch that is normally retained by the trip bar retainer; and the response device operates to release the latch. In a circuit breaker provided with a movable contactor that opens and closes via a link mechanism, at the time of a trip in which the response device operates and the trip bar retainer rotates, a part of the trip bar retainer is A circuit breaker characterized in that the trip bar hits the latch after hitting the latch. 2. The circuit breaker according to claim 1, wherein a part of the latch is provided with a slope, and a corner of the trip bar holding plate hits the slope when tripping.