JP2001126604A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact circuit breaker by improving the fixing structure of a stationary contactor. SOLUTION: A handle 17 is projected from a housing 3, one end of which a stationary contactor 8 is attached with a stationary contact point 8c at the leading end. On the other end of the housing 3, there is mounted a moveable contactor 13A with a moveable contact point 13b facing the stationary contact point 8c. The moveable contact point 13b may be moved to contact the stationary contact point 8c by means of the handle 17. When the moveable contact point 13b is contacting the stationary contact point 8c, an unusual currant flowing is broken manually. The stationary contactor 8 includes a leading extension 8d fixed to the housing 3 so as to make the moveable contactor 13A overlap the stationary contactor 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker for opening and closing contacts by turning a handle on and off.

[0002]

2. Description of the Related Art Conventionally, as this kind of circuit breaker, there is one disclosed in Japanese Patent Application Laid-Open No. 8-298048. As shown in FIG. 12, a body B having a handle A operably protruded outwardly is fixed to one end of the body B along the body B, and C ₁ is provided at a distal end side as shown in FIG. fixed contact C, the vessel body movable contact having a movable contact D ₁ of separable freely facing the fixed contact point C ₁ in toward one end extending to the fixed contactor C distally from the other end side of the B The movable contact D ₁ is brought into contact with and separated from the fixed contact C ₁ by operating the handle A, and both contacts C ₁ , D ₁
When an abnormal current flows while the contacts are in a contact state, the contacts are forcibly opened.

The fixed contact C has a rivet E inserted into an intermediate portion closer to one end of the body B than the fixed contact C ₁ , and is thereby caulked and fixed to the body B.

[0004]

In the INVENTION Problems to be Solved] conventional circuit breaker described above, the fixed contact C is a rivet E is inserted into one end side of the device body B than provided fixed contact C ₁ part An intermediate part for caulking is required. This intermediate portion is a constraint in reducing the size of the fixed contact C and, consequently, the overall structure.

The present invention has been made in view of the above points, and an object of the present invention is to provide a circuit breaker capable of improving the fixing structure of a fixed contact and reducing the overall structure. is there.

[0006]

In order to solve the above-mentioned problems, a circuit breaker according to a first aspect of the present invention includes a body having a handle operably protruding outward and a body extending along the body. And a movable contact extending from the other end of the body toward the one end and facing the fixed contact of the fixed contact so as to freely contact and separate from the fixed contact. A movable contact provided on the distal end side, and a circuit breaker forcibly opening when an abnormal current flows when the movable contact is brought into contact with and separated from the fixed contact by operating the handle, and both contacts are in a contact state. The fixed contact has a configuration in which a fixed portion is extended from a distal end so as to overlap with the movable contact in a side view toward the other end of the container, and the fixed portion is fixed to the container. .

According to a second aspect of the present invention, in the circuit breaker of the first aspect, the fixing portion is fixed to the body by locking the fixing portion.

According to a third aspect of the present invention, in the circuit breaker of the second aspect, the fixed portion has a width dimension on both sides in the extending direction smaller than that of the fixed contact in the vicinity of the fixed contact. I have to.

According to a fourth aspect of the present invention, there is provided the circuit breaker according to the second or third aspect, wherein a communication hole communicating with the outside is provided in the body, and the communication hole is provided in the communication hole. The fixing part is locked.

A circuit breaker according to a fifth aspect of the present invention is the circuit breaker according to the fourth aspect, wherein a closing member for closing the communication hole is attached to the body.

According to a sixth aspect of the present invention, there is provided the circuit breaker according to any one of the first to fifth aspects, wherein a clamping portion for clamping the fixed contact is provided on the body. ing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS.
This will be described below based on In addition, FIG. 1 is XX of FIG.
It is a sectional view.

1 is a body made of a synthetic resin molded product,
The container body 3 is formed together with the cover 2 made of a synthetic resin molded product. This body 1 has partition walls 1 at both ends in the longitudinal direction.
Terminal arrangement parts 1c, 1d, 1e, 1f on which terminals 4A, 4B, 4C, 4D are arranged are provided on both sides of a, 1b, and a handle 18, a fixed contact 8.The frame storage unit 1g that stores and arranges the opening / closing mechanism composed of members such as the movable contacts 13A and 13B,
It is composed of partitions 1a, 1b and a space surrounded by side walls.

The body 1 is provided with a spring seat 1h on which a coil spring 27 is mounted at the upper end of the partition wall 1a, for projecting both ends of a driving body 28 to be described later out of the frame housing 1g. Notch grooves 1j are provided on both side walls of frame storage portion 1g. Also, concave planes 1k, 1k formed on the outer surface of both side walls
In addition, locking projections 1m, 1m each having an upper end inclined surface are integrally protruded, and an insertion hole 1n for inserting a mounting screw is provided through the partition walls 1a, 1b. Further, a communication hole 1p communicating with the outside is provided at the bottom at one end side from the center, and a mounting step 1r for mounting near the bent portion of the fixed contact 8 is provided.
Is provided. The inner edge of the communication hole 1p serves as a locking portion 1q that locks a fixing portion 8d of the fixed contact 8 to be described later.

The cover 2 is formed in a box shape having an opening on one side, and has an opening window 2a for exposing a handle 18 at the bottom center.
The input-side partition piece 2g and the output-side partition piece 2h are erected toward the opening so as to partition a terminal fitting 5 described later on both ends. When the cover 2 is mounted on the body 1, the handle 18 is exposed from the opening window 2a, and the tip of the input-side partition 2g presses the fixed contact 8 toward the mounting step 1r of the body 1. And the mounting step 1r of the body 1
And pinch it between. That is, the input-side partition 2g of the cover 2 constitutes the holding portion 30 for holding the fixed contact 8 together with the mounting step 1r of the body 1.

At the center of both side walls of the cover 2, thin elastic leg pieces 2b having locking holes 2c, 2c are formed along the concave planes 1k, 1k of the outer surfaces of both side walls of the body 1. Provided,
When the cover 2 is attached to the body 1, the elasticity of the two and the inclined upper surface of the locking projection 1m are used to engage the locking projections 1m, 1m of the concave planes 1k, 1k with the locking holes 2c, 2c. By stopping
It can be fixed with one touch. Since the thickness of the elastic leg piece 2b and the depth of the concave plane 1k are substantially equal, the outer surface of the elastic leg piece 2b and the outer surface of the body 1 are flush.

Each terminal, which will be described later, is provided on both end faces of the cover 2.
Holes 2d corresponding to the terminal screws 6 of 4A, 4B, 4C, 4D are provided,
The terminal screw 6 can be tightened or loosened by inserting a driver from the outside. A concave portion 2e is provided at the center of both ends, and a body is provided at the bottom of the concave portion 2e.
Insertion holes 1n for inserting mounting screws through 1 bulkheads 1a and 1b
And an insertion hole 2f communicating with the insertion holes 1n and 2
The circuit breaker can be fixed to the distribution panel mounting site via mounting screws with mounting screws.

As shown in FIG. 10, each of the input terminals 4A and 4B is screwed into a terminal fitting 5 formed by bending a metal plate into a rectangular cylindrical shape and a screw hole 5a formed in the center of the upper piece of the terminal fitting 5. A terminal screw 6 to be mated; a metal holding metal fitting 7 for inserting a holding spring piece 7a, which is provided in the outer opening of the terminal fitting 5 and cut and raised at the lower end thereof, into the terminal fitting 5; It is composed of

In these input terminals 4A, 4B, terminal fittings 5 are fitted into terminal disposing portions 1c, 1d on one end side of the body 1.
The upper flat piece 8a of the fixed contact 8 to be described later is inserted between the presser spring piece 7a and the inner bottom of the terminal fitting 5 through the inner opening of the terminal fitting 5, and is pressed by the terminal screw 6 via the presser spring piece 7a. Can be

The fixed contact 8 has a substantially Z-shaped bent shape made of a conductive metal material.
An upper flat piece 8a located at one end side of the body 1 and a lower flat piece 8b located closer to the other end of the body 1 than the upper flat piece 8a.
As shown in FIG. 1, the movable contacts 13A, 13B are viewed from the side in a direction opposite to the direction in which the upper flat piece 8a is located from the tip of the lower flat piece 8b.
The fixing portion 8d is extended so as to overlap with. This fixing part 8d
Has a width dimension on both sides smaller than that of the lower flat piece 8b.
A fixed contact 8c is fixed to the lower flat piece 8b. The fixed contact 8 is fixed by inserting the fixing portion 8d into the communication hole 1p of the body 1, rotating the protruding portion protruding outward, and locking it to the inner edge of the communication hole 1p. As a result, it is fixed in the body 1.

As shown in FIG. 10, the output terminals 4C and 4D are also formed by a terminal fitting 5, a terminal screw 6, a holding fitting 7, and fixed terminal plates 9 and 10, which will be described later, similar to the input terminals 4A and 4B. Become. Then, terminal fittings are attached to the terminal arrangement portions 1e and 1f on the other end side of the body 1.
The fixed terminal plates 9 and 10 are extended to both sides of the frame accommodating portion 1g at the center of the body 1 and are disposed at fixed positions.

One fixed terminal plate 9 is made of a metal plate material.
It is formed in a substantially L-shape having an obtuse bent portion. One end thereof is inserted between the bottom of the terminal fitting 5 and the holding spring piece 7a of the holding fitting 7, and is held down by the terminal screw 6 via the holding spring piece 7a. The other end is located outside the terminal fitting 5, and the other end of the braided wire 12 having one end welded to a free end of a bimetal 11 described later is welded.

The other fixed terminal plate 10 is formed of a metal plate in a flat plate shape, and has one end disposed outside the terminal fitting 5, and one end thereof connected to one end of a movable contact 13B to be described later. A hole 10a is provided for fixing the hole.

The bimetal 11 detects an abnormal current flowing when both the contacts 8c and 13b are in contact with each other. The bimetal 11 has a substantially L-shaped bent shape, and has a movable contact (described later) at one end. A hole 13a for screwing and fastening the child 13A is provided. This bimetal 11 has a movable contact at one end.
13A and the hole 13a of the movable contact 13A.
1 and the fixing screw 14 is connected to the body 1 as shown in FIG.
And is screwed to the nut 15 to be fixed to the body 1 together with the movable contact 13A. The bimetal 11 has a braided wire 12 welded to its free end and a drive shaft 11b, which is inclined upward in FIG.

One of the movable contacts 13A has an intermediate portion bent so as to have a substantially rectangular cross section, and has one end extending from the other end in the longitudinal direction of the body 1 to one end in the same direction. ing. A movable contact 13b opposed to the fixed contact 8c is fixed to the other end, which is a free end of the movable contact 13A, in a downward direction in FIG.

The other movable contact 13B is formed in the same shape as the one movable contact 13A, has one end extending from the other end of the body 1 to one end, and has a hole 13a.
A movable contact 13b is fixed to the other end, which is a free end, downward in FIG. 10 so as to contact and separate from the fixed contact 8c. The other movable contact 13B is inserted into the body 1 with one end thereof superimposed on the fixed terminal plate 10, and the fixing screw 14 is inserted into the hole 13a and the hole 10a of the other fixed terminal plate 10 and screwed to the nut 15. By being fastened, it is fixed to the body 1 together with the other fixed terminal plate 10.

The frame 16 is a fixed piece provided with a screw hole 16a.
16b and a pair of side pieces 16c extending upward from the body 1 from both sides of the fixing piece 16b, and have a substantially H shape in a front view. On both side pieces 16c, 16c, a shaft hole 16d for receiving a handle pin 19 for rotatably supporting a handle 18, which will be described later, and a pin 21 for rotatably supporting a release plate 20 are received. The shaft hole 16e, a link 23 described later, and an operation plate
In FIG. 3, an elongated hole 16f is formed to insert the end of the connecting pin 22 to be inserted through the hole 43 so as to be vertically movable. Further, hook projections 16g, 16g, whose tips are bent downward, protrude from the lower end surfaces of the side pieces 16c on the terminals 4C, 4D side. Then, the downward end of the hooking projections 16g, 16g is
Then, a fixing screw 17 having a fixing piece 16b penetrating from the outside of the body 1 is screwed into a screw hole 16a and fixed to the body 1.

The handle 18 is made of a synthetic resin and comprises an operation section having an operation surface and a pair of leg pieces 18a provided below the operation section. A pair of leg pieces 18a have pin insertion holes 18b
A pin insertion hole 18c is provided near the base. Then, the pin insertion holes 18c and the shaft holes 16 of the both side pieces 16c of the frame 16 are formed.
By inserting the handle pin 19 through d, the frame 16 is rotatably supported between the side pieces 16c, 16c. This handle
The fitting 18 is always urged in the opening (OFF) direction by fitting the ring portion of the torsion spring 25 near the pin insertion hole 18c.
The torsion spring 25 has one end abutting on the lower surface of the handle 18 and the other end abuts on the pin 21 and is compressed and suspended.

The tripping plate 20 is for locking one end of an operation plate 26 to be described later, is formed in a frame shape, and has a pin insertion hole 20.
b, a frame piece at one end to be a latch piece 20c, a frame piece at the other end having a responsive portion 20f, and a hanging piece 20d having a locking step 20e. The trip plate 20 is fitted with the frame 16 into the opening 20a at the center thereof, and the frame pieces 16 on both sides of the frame 16 are fitted.
By disposing the pin 21 in the pin insertion hole 20b and the shaft hole 16e of the both side pieces 16c, 16c of the frame 16, the pin 21 is rotatably supported by the frame 16. Also, hanging pieces
One end of the operation plate 26 is locked to the locking step portion 20e of 20d, and the responsive portion 20f of the other end frame piece is interposed between the movable contact 13A and the bimetal 11, as shown in FIG. The bimetal 11 is arranged in parallel with the oblique end of the bimetal. The responsive portion 20f receives a downward force when the bimetal 11 is bent and deformed by heat. In addition, at the time of assembling into the body 1, the center part of the other end frame piece is rotated clockwise by a coil spring 27 mounted on a spring seat 1h at the upper end of the partition wall 1a as shown in FIG. Spring loaded as provided.

The link 23 is composed of two link pieces 23a, 23a and a connecting piece for connecting an intermediate portion thereof.
Pin insertion holes 23b, 23b are formed at the upper end of the pin 23a, and pin insertion holes 23c, 23c are formed at the lower end. The link pieces 23a, 23a have their upper ends interposed between the pair of leg pieces 18a, 18a of the handle 18, and have the pin insertion holes 18b, 18b of the two leg pieces 18a, 18a.
The connecting pins 24 are inserted into the 23b, 23b to be connected to the handle 18, and are disposed between the side pieces 16c, 16c of the frame 16 together with the leg 18a of the handle 18.

The operation plate 26 has a frame shape having an opening 26a by two side pieces having pin insertion holes 26b, 26b, one end piece having an oblique piece extending, and the other end piece having a concave portion on the back side. The operation plate 26 inserts both ends of the connecting pin 22 through the pin insertion hole 23c of the link 23, and pivotally supports the link 23. In the opening 26a, when the contacts 13b and 8c are opened,
The leg 18a of the handle 18 faces the lower end of the link 23. Then, both ends of this connecting pin 22 are
The movable plate 26 and the pivot point of the link 23 are vertically movable by being inserted vertically into the long hole 16f.

The driving body 28 includes a locking recess 28a and a projection 28b.
Having. The driving body 28 has both ends at both ends of the frame housing portion 1g through cutout grooves 1j on both side walls of the frame housing portion 1g.
It protrudes outward, and is disposed between the other end of the operation plate 26 and the bottom surface of the body 1 so as to be vertically movable in FIG. And
The vicinity of the free ends of the movable contacts 13A, 13B is inserted into the locking recess 28a, and is urged upward by the movable contacts 13A, 13B.
Further, the protruding portion 28b is fitted into a concave portion on the back side of the other end of the operation plate 26, and receives a pressing force of the operation plate 26.

Thus, the circuit breaker has terminals 4A, 4B, 4C, 4
D, the movable contacts 13A, 13B and the bimetal 11 are arranged, and the frame 16 incorporating the respective members is arranged in the frame accommodating portion 1g, the members are incorporated, and the cover 2 is attached on the body 1. Then, a lower lid (blocking member) 29 for closing the communication hole 1p is attached to the bottom surface of the body 1 to complete the assembly.

Next, the operation of this embodiment will be described below with reference to FIGS. FIGS. 1 to 3 show the OFF state, in which the handle 18 is given a counterclockwise turning force around the handle pin 19 by the bias of the torsion spring 25. At this time, the connecting pin 22 of the link 23 has moved upward in the long hole 16f in FIG. 3, and has moved the operating plate 26 upward. Further, the tripping plate 20 is in a state in which a turning power is applied clockwise about the pin 21 by the bias of the coil spring 27.

In this state, one end of the operating plate 26 is disengaged from the locking step 20e on the side of the latch piece 20c of the tripping plate 20, and the driving body 28 is movable on both sides as shown in FIG. It is in a state of being pushed upward by the contacts 13A and 13B. The movable contacts 13A, 13B are separated from the fixed contacts 8c, 8c facing the movable contacts 13b, 13b, and are in an open (off) state.

Next, in the off state shown in FIG.
When the operation surface of the handle 18 is pushed clockwise, the handle 18 rotates clockwise around the handle pin 19 against the bias of the torsion spring 25, and in conjunction with this, the link 23 is connected. While rotating counterclockwise about the pin 22 as a rotation center, the connecting pin 22 is moved downward in the elongated hole 16f in FIG. At the same time, the connecting pin 22 moves the operation plate 26 downward. Due to the movement of the operating plate 26, one end of the operating plate 26 hits the locking step 20e on the side of the latch piece 20c of the tripping plate 20, and when the operating surface of the handle 18 is further pressed, the operating plate 26
The other end pushes the driving body 28 downward against the bias of the spring.

By this movement, the driving body 28 pushes the free ends of the movable contacts 13A, 13B at both ends thereof against the urging of the spring, whereby the movable contacts 13b, 13b at the free ends of the movable contacts 13A, 13B.
Eventually, the fixed contacts 8c, 8c come into contact with each other, and the leg 18a of the handle 18 faces the opening of the operation plate 26, and the link 23 and the leg 18a
As shown in FIG. 5, the connecting pin 24 for connecting the handle 18 to the opposite side of the slot 16f from the previous state is
When the push operation is performed, as shown in FIG. 5, the movable contacts 13A,
13B is bent by the pressing of the driving body 28, and the movable contacts 13b, 13b
A contact pressure is generated between the fixed contacts 8c and 8c. Also, the spring force of the movable contacts 13A and 13B, the biasing force of the torsion spring
23, the release plate 20, the biasing force of the coil spring 27 of the release plate 20, the driving body 28, the operation plate 26, and one end of the operation plate 26 due to the mutual relationship between the handle 18 and the latch of the release plate 20. Piece 20c
The balance is maintained in a state of being locked to the side locking step 20e.

This state is the ON state shown in FIGS. In this ON state, the upper surface of the trip plate 20 distant from the pivot point of the pin 21 abuts on the lower end of the handle pin 19 to restrict the rotation of the trip plate 20, so that the trip plate 20 is always in the same position. And the tripping characteristics are hardly affected.

Next, when returning from the on state to the off state by manual operation, the operation surface of the handle 19 may be pushed to the side opposite to the previous operation. That is, by this pushing operation, the handle 18 rotates counterclockwise in FIG. 5 around the handle pin 19, and the link 23 is moved in conjunction with the movement of the connection pin 24 penetrating the lower end of the leg piece 18a. The connection pin 22 that has moved and penetrated the link 23 moves upward in the long hole 16f, and moves the operation plate 26 upward. By this movement, the above-mentioned equilibrium state is released, and the movable contacts 13A,
13B pushes the driving body 28 by the spring force to move the free end upward in FIG. 6, and separates the movable contacts 13b, 13b from the fixed contacts 8c, 8c. On the other hand, the return force of the torsion spring 25 causes the handle 18 to rotate counterclockwise at once. As a result, the connecting pin 24 moves upward, and the connecting pin 22
1 to 3 and return to the off state shown in FIGS.

Next, an operation when an excessive current flows in the load circuit connected to the power supply via the circuit breaker will be described. In the ON state shown in FIGS.
When an excessive current flows through the electrical paths of A, fixed contact 8c, movable contact 13b, movable contact 13A, bimetal 11, braided wire 12, and terminal 4C, bimetal 11 generates heat by itself. Due to this heat, the free end of the bimetal 11 is displaced in the direction of the bottom surface of the body 1 (downward in FIG.
Press 20f.

When the tripping plate 20 receives a pressing force on the responsive portion 20f, the tripping plate 20 rotates counterclockwise around the pin 21 against the spring bias of the coil spring 27, and contacts with one end of the operating plate 26. The engagement with the engagement step 20e is released. As a result, a downward force acts on the other end of the operation plate 26 via the driving body 28, and the connection pin 22
, The movable contacts 13b, 13b are separated from the fixed contacts 8c, 8c to cut off the current.

At the same time, the handle 18 rotates counterclockwise around the handle pin 19 by the return force of the torsion spring 25, and returns to the off state as in the manual off operation.

As a result, the bimetal 11 no longer generates heat, returns to its original state, and releases the pressing of the responsive portion 20f of the tripping plate 20. 7 to 9 show states during a trip operation when the above-described overcurrent flows.

As described above, in this circuit breaker, the handle
The switch can be turned on and off by the manual operation of 18 with the same operational feeling as a wave switch.If an excessive current flows in the load circuit, the opening and closing mechanism trips due to the operation of the bimetal 11, and the trip operation causes the contact Part is forcibly opened to cut off the current.

In such a circuit breaker, the fixed contact
8, a fixing portion 8d extends from the tip to the other end of the body 3,
Since it is locked by the locking portion 1q of the container 3, even if the extension of the fixed portion 8d becomes long, it is absorbed by the extension of the movable contacts 13A and 13B, and riveting is performed. In comparison with the case where a fixed portion such as
The size of the fixed contact 8 and the circuit breaker can be reduced.

Further, since the width of the fixed portion 8d on both sides in the extending direction is made smaller than that of the vicinity of the fixed contact 8c of the fixed contact 8, the locking amount is reduced, and the fixed portion 8d is locked by the locking portion 1q. Work becomes easier.

Further, since the fixing portion 8d is rotated by being locked by the locking portion 1q, the rotation of the protruding portion protruding outward from the communication hole 1p increases the space for rotation. The circuit breaker itself can be reduced in size because it is not necessary to secure it inside the housing 3 and it is not necessary to increase the size of the housing 3.

After the fixing portion 8d is locked by the locking portion 1q, the lower cover (closing member) 29 for closing the communication hole 1p is attached, so that the communication hole 1p becomes invisible. It looks better.

Further, the fixed contact 8 is provided with the holding portion 30 of the body 3.
Between the movable contacts 13b, 13
Even if b is slightly welded to fixed contacts 8c, 8c
The fixed contacts 8c, 8c are not displaced along with the operation of 13A, 13B, and the movable contacts 13 slightly welded to the fixed contacts 8c, 8c are not displaced.
b, 13b can be separated, and the blocking performance does not decrease.

In the present embodiment, the width of the fixed portion 8d on both sides in the extending direction is smaller than that of the fixed contact 8 near the fixed contact 8c. If the amount of work can be increased, fixed contact 8c
It may have the same width dimension as the vicinity.

Further, in the present embodiment, the container body 3 is provided with the communication hole 1p which communicates with the outside and the inner opening edge becomes the locking portion 1q. For example, the rotation of the fixing portion 8d when locking is performed. When such a case is not involved, a projection serving as the locking portion 1q may be provided in the body 3.

In the present embodiment, the body 3 is provided with a communication hole.
The lower lid (closing member) 29 that closes 1p is attached,
Even when the communication hole 1p is provided, for example, the communication hole
When 1p is not so noticeable, the lower lid (closing member) 29 does not need to be attached, and in that case, the number of parts can be reduced.

In the present embodiment, the body 3 is provided with the holding portion 30 for holding the fixed contact 8. For example, when the fixed contact 8 is fixed sufficiently firmly, the holding portion 30 is provided.
It is not necessary to provide 30.

In this embodiment, the fixed contacts 8, 8
Are extended from the input terminals 4A and 4B to the output terminals 4C and 4D, and the movable contacts 13A and 13B are extended from the output terminals 4C and 4D to the input terminals 4A and 4B, but are fixed. Even if the contacts 8, 8 extend from the output terminals 4C, 4D to the input terminals 4A, 4B, the movable contacts 13A, 13B extend from the input terminals 4A, 4B to the output terminals 4C, 4D. The same effect can be obtained.

In this embodiment, the fixing portions 8d of the fixed contacts 8, 8 are fixed by being fixed to the communication holes 1p of the body 3, but are fixed to the body 3 by riveting, for example. Even if it does so, the extension of the fixed portion 8d will be absorbed by the extension of the movable contacts 13A, 13B, and the fixed portion is provided in a portion that does not overlap with the movable contacts 13A, 13B in side view. As compared with the case, the circuit breaker can be downsized.

[0056]

According to the first aspect of the present invention, in the circuit breaker, the fixed contact extends from the tip so as to overlap with the movable contact in a side view toward the other end of the body, and the fixed contact is fixed. Because the fixed part is fixed to the body, even if the extension of the fixed part becomes long, it will be absorbed by the extended dimension of the movable contact, and it will be fixed to the part that does not overlap with the movable contact in side view The circuit breaker can be reduced in size as compared with the case where the unit is provided.

In the circuit breaker according to the second aspect, in addition to the effect of the circuit breaker according to the first aspect, the fixing portion is fixed to the body by being locked to the body. No other parts such as rivets are required.

In the circuit breaker according to the third aspect, in addition to the effect of the circuit breaker according to the second aspect, the fixed portion has a smaller width on both sides in the extending direction than the vicinity of the fixed contact in the fixed contact. Therefore, the locking amount is reduced, and the operation of locking the container to the fixing portion is facilitated.

In the circuit breaker according to the fourth aspect, even when the fixing portion is locked in the communication hole and a rotating operation is required, the projecting portion protruding outward from the communication hole is rotated. , It is not necessary to secure space for rotating inside the body, and it is not necessary to enlarge the body,
The effect according to claim 1 in which the circuit breaker itself can be downsized can be further obtained.

According to the circuit breaker of the fifth aspect, in addition to the effect of the circuit breaker of the fourth aspect, a closing member for closing the communication hole is attached after the fixing portion is locked in the communication hole. As a result, the communication hole becomes invisible, so that the appearance is improved.

According to a sixth aspect of the present invention, in addition to the effects of the circuit breaker according to any one of the first to fifth aspects, the fixed contact is held between the holding portions of the body. Even if the movable contact is slightly welded to the fixed contact, the fixed contact is not displaced with the operation of the movable contact, and the movable contact slightly welded to the fixed contact can be separated. Yes, and the blocking performance does not decrease.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an OFF state according to an embodiment of the present invention.

FIG. 2 is a plan view of an embodiment of the present invention in an OFF state.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a plan view showing an ON state according to an embodiment of the present invention.

FIG. 5 is a sectional view taken along line XX of FIG. 4;

FIG. 6 is a sectional view taken along line YY of FIG. 4;

FIG. 7 is a plan view of a trip state according to the embodiment of the present invention.

FIG. 8 is a sectional view taken along line XX of FIG. 7;

FIG. 9 is a sectional view taken along the line YY of FIG. 7;

FIG. 10 is an exploded perspective view of the same.

FIG. 11 is a plan view of a fixed contact.

FIG. 12 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Body 1p Communication hole 2 Cover 3 Body 4A Input terminal 4B Input terminal 4C Output terminal 4D Output terminal 8 Fixed contact 8c Fixed contact 8d Fixed part 13A Movable contact 13B Movable contact 13b Movable contact 17 Handle 29 Lower lid (closed) Parts) 30 Holding part

Claims (6)

[Claims] 1. A container having a handle operably protruded outward, a fixed contact fixed to one end of the container along the container and provided with a fixed contact at a distal end, A movable contact extending from the end to the one end and having a movable contact provided on the distal end side, the movable contact being opposed to the fixed contact of the fixed contact so as to be able to freely contact and separate;
A circuit breaker for moving the movable contact to and away from the fixed contact by operating the handle and forcibly opening the contact when an abnormal current flows when both contacts are in contact with each other. A circuit breaker, wherein a fixed portion is extended from a front end so as to overlap with the movable contact in a side view toward the other end, and the fixed portion is fixed to the body. 2. The container according to claim 1, wherein the fixing portion is fixed by locking the fixing portion.
The circuit breaker as described. 3. The circuit breaker according to claim 2, wherein the fixed portion has a smaller width on both sides in the extending direction of the fixed contact than in the vicinity of the fixed contact. 4. The circuit breaker according to claim 2, wherein the vessel has a communication hole communicating with the outside, and the fixing portion is locked in the communication hole. vessel. 5. The circuit breaker according to claim 4, wherein a closing member for closing the communication hole is attached to the body. 6. The container according to claim 1, wherein the container has a holding portion for holding the fixed contact.
The circuit breaker according to any one of the above.