JP3503534B2 - Electromagnetic trip device for circuit breakers - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic trip device for a circuit breaker in which a movable iron core is attracted to a fixed iron core to release a latch when an excessive current flows in a current-carrying circuit to forcibly open contacts. .

[0002]

2. Description of the Related Art As an electromagnetic trip device for a circuit breaker of this type, there is one disclosed in Japanese Patent Laid-Open No. 58-131626. This conventional example has a structure in which a movable iron core is located at a position apart from a fixed iron core and is biased in a latching direction by a torsion coil spring.

[0003]

In the above-mentioned conventional example, the movable iron core and the fixed iron core are completely separated, and since the movable iron core is biased in the latching direction by the torsion coil spring, the electromagnetic tripping is performed. There is a problem that the installation space for the device itself is required. Further, since the movable iron core and the fixed iron core are completely separated, there is a problem that the suction force of the movable iron core is weakened.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic trip device for a circuit breaker that can be downsized and can increase the attraction force of a movable iron core. To provide.

[0005]

According to a first aspect of the present invention, there is provided a fixed iron core formed in a substantially U shape by two side pieces and a connecting piece connecting these side pieces, and two fixed iron cores. A current-carrying electric path that penetrates through the space formed by the side piece and the connecting piece, and the current-carrying electric path is arranged so as to be sandwiched between the fixed iron core, and one end side serves as a rotation center point and the other end side is a free end. And a return member for returning the free end side of the movable iron core from the center of rotation of the movable iron core in the direction away from the fixed iron core, and the free end of the movable iron core when an excessive current flows in the energizing circuit. In the electromagnetic tripping device of the circuit breaker in which the is attracted to the fixed core side around the center of rotation to release the latch and forcibly open the contact, the return member is attached to the movable core on one side. Then, the rotation center point of the movable iron core is set to 2 of the fixed iron core. Consists of being in contact with the side piece by a leaf spring for holding said movable iron core, the other of the plate spring
One side is attached to both side pieces of the fixed iron core, and
One side of the leaf spring is provided with a movable iron core between both side pieces of the fixed iron core.
It is characterized by being attached to the inner surface of .

The invention of claim 2 is characterized in that, in the invention of claim 1 , one side of the leaf spring is attached to a free end side of the movable iron core.

[0007] In the present invention of claim 3, in the invention of claim 1, wherein the kite is attached to one side of the leaf spring to pivot center side of the movable iron core.

According to a fourth aspect of the present invention, in the second or third aspect of the invention, the fixed iron core separated from the one side for attaching the other side of the leaf spring to the movable core is a free end side of the movable core or It is characterized in that it is attached to a position corresponding to the center of rotation.

According to the invention of claim 5 , a fixed iron core formed in a substantially U-shape by two side pieces and a connecting piece connecting these side pieces to each other, and two side pieces and a connecting piece of the fixed iron core are used. A current-carrying electric path that penetrates the space formed, and a movable iron core that is disposed so as to sandwich the current-carrying electric path between a fixed iron core and has one end as a rotation center point and the other end as a free end. A return member for returning the free end side of the movable iron core from the fixed iron core in a direction away from the fixed iron core, and the free end of the movable iron core is set to the rotational center point when an excessive current flows in the energization circuit. In the electromagnetic trip device of the circuit breaker which is attracted to the fixed core side at the center to release the latch and forcibly open the contacts, the return member is attached to the movable core on one side and Abut the rotation center point on the two side pieces of the fixed core. Formed of a leaf spring for holding the movable iron core in a state in which the fixed and the other side of the leaf spring
Attached to both sides of the iron core and one side of the leaf spring
With the invention of claim 6, wherein <br/> was attached that on the outside of the movable core across the movable iron core, in the invention of claim 5, the one side the movable iron core of said leaf spring It is characterized in that it is attached to the side of the center of rotation.

According to a seventh aspect of the invention, in the sixth aspect of the invention, the leaf spring is attached to the movable iron core by protruding from both side pieces of the fixed iron core to the outside of the outer surface of the movable iron core and folding back. It is characterized by that.

According to an eighth aspect of the invention, in the fifth aspect of the invention, one side of the leaf spring extends from the rotation center point side of the movable core to the free end side substantially at the center between both side pieces of the fixed core. It is characterized in that it is taken out and attached to the free end side of the movable iron core.

In the invention of claim 9 , claim 5 or claim 5
In the invention of claim 8 , the other side of the leaf spring is attached to both side pieces of the fixed core along the free end side of the movable iron core, and the other side of the leaf spring is attached to the free end side of the movable iron core. It is characterized in that it is projected to the outer surface, and approximately the middle between the one side and the other side of the leaf spring is extended to the rotation center point side of the movable iron core.

According to a tenth aspect of the invention, in the first to ninth aspects of the invention, two leg pieces facing the outer surface or the inner surface of both side pieces of the fixed iron core are provided on the other side of the leaf spring,
A locking portion is formed on the two leg pieces, and a locked portion to be locked by the locking portion is formed on an outer surface or an inner surface of both side pieces of the fixed iron core.

According to the invention of claim 11 , claim 1 to claim
In the invention of Item 10, the two side pieces are formed so as to be gradually inclined toward the connecting piece from an end surface of the movable iron core on a rotation center point side to an end surface of the movable iron core on a free end side. It is characterized by

[0015]

DETAILED DESCRIPTION OF THE INVENTION One embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 3, the circuit breaker using the electromagnetic trip device of the present embodiment is constructed by superposing and coupling the first side case 1A and the second side case 1B made of synthetic resin on both sides. In the body 1, two fixed contacts 2A and 2B arranged side by side in the width direction of the body 1 and the respective fixed contacts 2A and 2B
Movable contacts 3A, 3 facing and freely contacting and opening
Two movable contacts 4A and 4B to which B is fixed, and an opening / closing mechanism 5 that drives these two movable contacts 4A and 4B are provided, and each movable contact 3A via the opening / closing mechanism 5 by an on / off operation of the handle 6. , 3B are brought into contact with and separated from the fixed contacts 2A, 2B, and the fixed contacts 2A, 2B and the movable contacts 4A, 4B are arranged vertically in the height direction of the body 1 and Of the movable contacts 4A, 4B, one movable contact 4B interposed between the two fixed contacts 2A, 2B in the height direction, and the fixed contact 2A with which the movable contact 3A of the other movable contact 4A comes into contact with and separates from each other. Is arranged at a height position where the movable contacts 3A, 3B are separated from the fixed contacts 2A, 2B when viewed from the width direction of the body 1 without crossing.

Inside one end of the body 1, both cases 1A and 1B are provided.
A partition member (hereinafter referred to as an intermediate case) 7 formed of a synthetic resin material is disposed so as to be sandwiched between the recesses 8 inside the side wall (outer wall) of the first side case 1A and the vertical direction of the intermediate case 7. The fixed contact 2A is provided in the partition formed with the wall portion 35.
Terminal block 10A having a fixed-side electric circuit configuration with a wire provided at one end
And a lower fixed contact 2B provided at one end in a partition formed by a recess 9 provided on the second side case 1B side of the intermediate case 7 and a side wall (outer wall) of the second side case 1B. A terminal block 10B, which is a side electric path configuration, is housed.

The opening / closing mechanism 5 for driving the movable contacts 4A and 4B to open and close includes an operating plate 43 as a latch member and a crossbar 4.
0, a first tripping plate 41 having a stepped locking portion 57 for locking one end of the operating plate 43, a second tripping plate 42,
In addition to these, a handle 6 and a U-shaped link 44, two bimetals 45 and 46 that drive the opening / closing mechanism 5 at the time of detecting an overcurrent, and further drive the opening / closing mechanism 5 when a short-circuit current flows. And the electromagnetic drive units 47 and 4 shown in FIG.
8 is added to form a common part. These electromagnetic drive units 47 and 48 are the electromagnetic trip device of the circuit breaker of the present invention.

As shown in FIG. 1, the electromagnetic drive unit 47 includes a fixed iron core 74 having a U-shaped horizontal cross section, which is formed by bending a magnetic iron plate in an inverted L shape and bending both side ends of the vertical piece at right angles, and a movable iron core. 58 and a leaf spring 73 that rotatably opposes and supports the movable iron core 58 on the magnetic pole surfaces of both ends of the fixed iron core 74, and is a return means at the time of rotation, and is integrally formed at right angles to the fixed iron core 74. The horizontal flat plate 75 is inserted between the outer horizontal piece 71a and the inner horizontal piece 71b of the conductive plate 71, and the cutout groove 75a at the center of both side edges of the flat plate 75 is inserted into the center of both side edges of the outer horizontal piece 71a. The fixed iron core 74 is fixed to the conductive plate 71 as shown by engaging the inverted T-shaped piece 76 hung from the portion.

The movable iron core 58 is made to project to the surface on the fixed iron core 74 side, and the projections 58b, 58b are formed on the central piece 73a of the leaf spring 73.
It is rotatably supported by the leaf spring 73 by being inserted into the holes 73b, 73b formed at the upper end of the and fixed by caulking. The leaf spring 73 includes side pieces 73c, 73c formed by bending both sides of the central piece 73a, and side pieces 74a, 7c of the fixed iron core 74.
Both side pieces 73c, 7 are arranged along the outer surface of 4a.
Locking pieces 73d, 73d protruding inward from the tip of 3c
Is formed in the outer corner of the fixed iron core 74.
It is fixed to the fixed iron core 74 by being locked to 4b.

Here, the fixed iron core 74 includes both side pieces 74a, 74a.
The end face of "a" is the side pieces 74a, and the end faces of 74a are the movable iron core 58.
The inclined surfaces 74c and 74c are inclined so as to gradually approach the vertical piece that is the connecting piece from the end on the side of the rotation center point to the end on the free end side of the movable iron core 58. The magnetic pole surface composed of the inclined surfaces 74c, 74c of the both side pieces 74a, 74a of the fixed iron core 74 has a center piece 73a of the leaf spring 73, and both side pieces 73c,
73c, the movable iron core 58 faces the movable iron core 58, and when an excessive current such as a short-circuit current flows to the conductive plate 71, the movable iron core is generated by the magnetic force generated on the magnetic pole surfaces of the both side pieces 74a, 74a of the fixed iron core 74. 58 is attracted to rotate the movable iron core 58 around a portion (lower edge in the figure) which is in contact with the end of the magnetic pole surface as a rotation center, and is projectingly provided on the free end side end face of the movable iron core 58. The drive part 58a is moved.

An insertion hole 72 of the outer lateral piece 71a of the conductive plate 71 is provided.
The adjusting screw 77 is attached to the screw hole 78 provided in the center of the flat plate 75.
Is screwed in, and its tip is made to face the horizontal piece of the upper end inverted L-shaped portion of the bimetal 45 via the inner horizontal piece 71b, and the adjustment screw 7
The initial position of the lower end of the bimetal 45 can be adjusted by bending the inner lateral piece 71b by screwing 7 (see FIG. 4).

A common terminal T1 described later is welded and fixed to the lower end of the vertical piece 71c of the conductive plate 71, and a braided wire 79 whose one end is welded to the movable contact 4A is provided on the plate surface slightly above the lower end of the bimetal 45. The other end of the common terminal T1,
The conductive plate 71, the bimetal 45, the braided wire 79, and the movable contactor 4A are electrically connected.

On the other hand, as shown in FIG. 8, the movable contactor 4B, which holds the electromagnetic drive portion 48, is folded back in a U shape with the rear end portion as an outer piece to form an inner lateral piece 80 parallel to the rear end portion. The lower end L of the bimetal 46 is attached to the step surface at the upper end of the inner horizontal piece 80.
The horizontal piece of the character-shaped folded portion is placed, welded and fixed, and the bimetal 46 is erected.

As shown in FIG. 2, the electromagnetic drive unit 48 is composed of a fixed iron core 74, a leaf spring 73 and a movable iron core 58, which are formed in the same shape as that of the electromagnetic drive unit 47 described above. The flat plate 75 formed integrally is used as the movable contactor 4.
It is inserted between the rear end portion of B and the inner horizontal piece 80, and is made to stand from the center portion of both side edges of the rear end portion of the movable contactor 4B in the notch groove 75a in the center portion of both side edges of the flat plate 75. By engaging the T-shaped pieces 76, the fixed iron core 74 is fixed to the rear end of the movable contactor 4B as shown in the figure.

The movable iron core 58 is protruded from the surface on the fixed iron core 74 side, and a protrusion (not shown) is inserted into the holes 73b and 73b formed at the upper end of the central piece 73a of the leaf spring 73 so as to be fixed by caulking. The leaf spring 73 is rotatably held by the leaf spring 73. The leaf spring 73 is formed by bending both side pieces 73c and 73c formed on both sides of the central piece 73a to both side pieces 74a and 74a of the fixed iron core 74.
Both side pieces 73c, 73c are arranged along the outer surface of the
An engaging piece (not shown) protruding inwardly at the tip of is fixed to the fixed iron core 74 by engaging with concave portions 74b, 74b formed at the outer corners of the fixed iron core 74.

The magnetic pole surface composed of the inclined surface 74c which is the end surface of the both side pieces 74a, 74a of the fixed iron core 74 faces the movable iron core 58 through the gap between the central piece 73a of the leaf spring 73 and the both side pieces 73c, 73c. , Both side pieces 7 of the fixed iron core 74 when an excessive current such as a short circuit current flows to the movable contact 7B.
The movable iron core 58 is attracted by the magnetic force generated on the magnetic pole surfaces of the magnetic cores 4a and 74a and rotated in the same manner as described above, and the drive portion 58a protruding on the end surface of the movable iron core 58 on the free end side is moved.

An adjusting screw 77 is screwed from below into a screw hole 78 provided in the center of the flat plate 75 through an insertion hole (not shown) provided at the rear end of the movable contactor 4B, and the tip of the adjusting screw 77 is attached to the bimetal 46. It is possible to adjust the upper end position of the bimetal 46 by facing the horizontal piece of the lower end L-shaped portion via the inner horizontal piece 80 and bending the inner piece horizontal 80 by screwing the adjustment screw 77 forward. (See FIG. 4).

On the plate surface slightly below the upper end of the bimetal 46, the above-mentioned selection terminal T2 in the slide member 83 described later is provided.
The other end of the braided wire 82 having one end welded thereto is welded, and the selection terminal T2, the bimetal 46, and the movable contactor 4B are electrically connected.

Inside the other end of the body 1, the lowermost conductive bar of the three conductive bars (not shown) arranged at different positions (vertical direction) is inserted and connected 1 At least two storage bars 90 corresponding to the two conductive bars, and a storage portion 90 for storing and arranging one common terminal T1 and one selection terminal T2 for selecting and connecting one of the remaining two conductive bars. An inner storage portion 200 is provided so as to be movable between positions.

The common terminal T1 and the selection terminal T2 are both substantially U-shaped, and are composed of blade receiving springs that are expanded toward the tips after the tips of both side parallel pieces come close to each other differently. The insertion of the conductive bar is facilitated, and the conductive bar is sandwiched between adjacent parts in the middle.

In the inner housing portion 200, the inner housing portion 200 of the first side case 1A is configured as a positioning means for positioning the selection terminal T2 at two positions respectively corresponding to the remaining two conductive bars. A projection 97 having a substantially semicircular cross section is provided on the end wall surface of the compartment in the width direction of the first side case 1A.

On the wall corresponding to the ceiling of the inner housing portion 200 of the body 1, as a display means for displaying which of the two upper and middle conductive bars the selection terminal T2 corresponds to. , The through hole 2 communicating with the inner storage portion 200
01 is provided, and the columnar display portion 2 is formed from the through hole 201 on the slide member 83 accommodating the selection terminal T2.
The position of the selection terminal T2 can be known depending on whether 02 is visible from the outside facing the through-hole 201 or not visible from the outside because it is located away from the through-hole 201. It is also possible to push the slide member 83 from the outside through the through hole 201 and move it downward. The through hole 201 is a circular hole formed by abutting the semicircular cutout holes 201a provided on the upper side walls of the both-side cases 1A and 1B.

The slide member 83 is formed in the shape of a frame whose both end surfaces corresponding to both end directions of the body 1 made of a synthetic resin molding are open, and one end of the blade receiving spring constituting the selection terminal T2 is opened. The selection terminal T2 is held by inserting from the other end opening so that the tip of the blade receiving spring projects from the other end opening, and the selection terminal T2 is movable in the up and down direction in the inner storage part 200 together with the slide member 83. Is located in.

Vertical guide grooves are provided on the inner surfaces of the side walls of the both-side cases 1A and 1B which form the both side walls of the inner housing portion 200, and which vertically engage with slide protrusions 203 formed on both sides of the slide member 83. 204 is formed between two parallel projections 205, and the inner housing portion 200 slides the slide member 83 with the slide projections 203 on both sides of the slide member 83 engaged with the guide grooves 204, 204 on both side walls. At the same time, the selection terminal T2 is stored and held so as to be slidable in the vertical direction.

The slide member 83 is a leg piece 8 extending downward from the side portion of the first side case 1A as shown in FIG.
3a is integrally formed to extend, and a protruding portion 206 protruding outward is formed at the lower end portion of the leg piece 83a.

The projecting portion 206 has a guide groove (not shown) formed upward from the bottom surface of the first side case 1A on the outside of the side wall of the first side case 1A forming the side wall of the inner storage section 200. It is inserted into a guide groove (not shown) from an insertion hole 208 opened at the bottom of the upper end so as to communicate with the inner storage portion 200, and is vertically slidable in the guide groove (not shown) together with the leg pieces 208. Is located.

Therefore, the protruding portion 206 has the inner storage portion 200.
An operation unit for vertically moving the selection terminal T2 in the inside is configured, and the slide member 83 in the inner storage unit 200 is held by holding the protrusion 206 from the outside of the body 1 or pushing up or down with a driver or the like. It is possible to move the selection terminal T2 mounted on the slide member 83 upward or downward by moving the selection terminal T2 mounted on the slide member 83 upward or downward by the guide of the slide protrusion 203 and the guide groove 204.

Here, the position where the protrusion 206 is at the lower end of the slide groove (not shown) is the position where the selection terminal T2 corresponds to the conductive bar in the middle stage, and the protrusion 206 is the slide groove (not shown). The length of the leg piece 83a and the slide groove (not shown) are configured so that the position on the upper side corresponds to the position where the selection terminal T2 corresponds to the conductive bar on the upper stage. The position of the terminal T2 can correspond to the upper conductive bar or the intermediate conductive bar.

When the slide member 83 is moved by the above operation, the upper end or the lower end of the slide member 83 rides over the positioning protrusion 97 by its elasticity and the rounded surface of the positioning protrusion 97, and after the movement, the positioning protrusion 97 is framed. The lower part or the upper part of the tip of the portion 83 hits and holds the position of the selection terminal T2.

At the other end of the body 1, both side cases 1
Inserting portions 209a to 209c for inserting a conductive bar, which have end faces and side faces opened by abutting L-shaped notch grooves formed on the end walls and side walls of A and 1B, are formed into three stages of upper, middle, and lower. It is formed so as to correspond to the three conductive bars provided, and the upper and middle insertion portions 209a and 209b are inside the inner storage portion 200, and the lowermost insertion portion 209c is inside the storage portion 90. Is in communication with.

The common terminal T1 is used for the electromagnetic drive unit 4 which will be described later.
A conductive plate 71 for fixing and holding 7 is mechanically integrally connected and electrically connected, and the selection terminal T2 is electrically connected to a bimetal 46 described later through a braided wire 82.

Now, the terminal block 1 electrically connected to the common terminal T1 and the selection terminal T2 through the opening / closing mechanism 5.
Of 0A and 10B, the terminal block 10A is a terminal plate 11 bent in a U-shape and integrally extends above one end of a lower piece of the terminal plate 11 and extends from the upper end of the extension piece 11a to an extension piece 11a. A fixed contactor 12A that is bent at a right angle to the terminal plate 11 and integrally extends outwardly with respect to the terminal board 11, and a fixed contactor 2A that is caulked and fixed to the upper surface of one end of the fixed contactor 12A.
And a substantially U-shaped locking spring 13A placed on the lower piece of the terminal plate 11 and housed in the terminal plate 11, on the bottom surface of the recess 8 of the first side case 1A which is inclined downward. The lower piece of the terminal plate 11 is placed on the rising wall 8 at one end of the recess 8.
The extending piece 11a is arranged along the a, and the rising wall 8
The fixed contact 12A is led out of the concave portion 8 beyond the upper end of a, and is inclined similarly to the bottom portion of the concave portion 8 between the rising wall 8a and the partition wall 14 rising from the bottom portion of the first side case 1A. By disposing the tip of the fixed contact 12A on the fixed contact arranging portion 15 formed integrally, the terminal block 1
0A is arranged in the recess 8. The fixed contact arrangement portion 15 is formed with a recess 15a that allows the lower end of the fixed contact 2A protruding to the lower surface side of the fixed contact 12A to escape. The terminal plate 11 is integrally formed with a T-shaped piece 11b extending upward from the other end of the upper piece, and one end of a side protrusion of the upper end of the T-shaped piece 11b is attached to the inner surface of the first side case 1A. It is placed on the upper end surface of the convex flat portion 22 formed on the. Further, on the side surface of the side piece of the terminal plate 11, there is integrally formed a protrusion 23 which is inserted into the pressing piece 13b of the locking spring 13A and prevents rattling of the locking spring 13A.

The locking spring 13A and the terminal plate 11 constitute a quick-connect terminal which is a conductor connecting portion, and when the intermediate case 7 is superposed on the first side case 1A, the other end portion of the first side case 1A is Diagonal downward groove 1 with a semicircular cross section formed in the vertical wall
60 and an oblique downward electric wire insertion hole 16A formed by an oblique downward groove 160 of a similar shape formed on the opposing wall surface of the intermediate case 7 as shown in FIG. 5, an electric wire (not shown) inserted from the outside. ) Is press-fitted between the upper piece of the terminal plate 11, the upper end of the locking piece 13a of the locking spring 13A, and the upper end of the pressing piece 13b, and the tip of the locking piece 13a moves the core wire in the wire withdrawing direction. By locking and pressing the core wire against the upper piece of the terminal plate 11 by the upper end surface of the pressing piece 13b, the core wire is electrically connected and mechanically held.

This electric wire lock is released by the release handle 17, and the release handle 17 has the rotation shaft 18 provided on the lower side surface thereof and the shaft hole 20 provided on the convex flat portion 22 on the inner side surface of the first side case 1A. A shaft 36 that is rotatably pivoted to and projecting from the wall surface of the vertical wall portion 35 of the intermediate case 7 is rotatably pivoted to a recess 37 provided on the other side surface of the lower portion. When the operating portion 17a exposed to the outside of the body 1 is manually operated and rotated counterclockwise, the drive protrusion 19 provided at the lower end is the tip of one side end of the locking piece 13a of the locking spring 13A. By pushing, the locking piece 13a is bent and the locking with respect to the core wire can be released. Reference numeral 21 in FIG. 3 denotes a return spring that constantly urges the release handle 17 to rotate clockwise.

On the other hand, the terminal block 10B is basically the same as the terminal block 10A and has a terminal plate 11 and a locking spring 13B.
And the fixed contactor 12B, the terminal block 10 is different from the terminal plate 11 of the terminal block 10A.
The terminal plate 11 of B extends downward from one end of the lower piece 1
1c is formed by extending, and the body 1 is formed from the tip of the extending piece 11c.
A fixed contact 12B is formed so as to extend in parallel with the bottom of the terminal plate, and an inner piece 11d that extends at a right angle from one end of the side piece of the terminal plate 11 is formed.

The locking spring 13B has the same structure as the locking spring 13A, and is placed on the lower piece of the terminal plate 11,
The protrusion 23 protruding from the side piece of the terminal board 11 is the pressing piece 1.
It is designed to be inserted into 3b.

The terminal block 10B constitutes the bottom of the recess 9 of the intermediate case 7, and the lower piece of the terminal plate 11 is placed on the lateral wall 24 extending substantially parallel to the bottom of the body 1. The back piece 11d is provided along the vertical wall 25 at one end of the recess 9, and one end of the terminal plate 11 is extended by fitting the notch 27 formed between the lower end of the vertical wall 25 and the one end of the horizontal wall portion 24. The piece 11c is projected to the outside of the recess 9, and when the intermediate case 7 is superposed on the first side case 1A side, the tip of the fixed contactor 12B, that is, the lower surface provided with the fixed contact 2B is the first side. It is designed to be placed on the ribs 26, 26 at the bottom of the case 1A.

The fixed contact 2B is the lateral wall portion 24 of the intermediate case 7.
Further, it is arranged across both the cases 1A and 1B in a space formed between the bulging portion 30 and the side walls of the both cases 1A and 1B described later. The recess between the ribs 26, 26 is the fixed contact 12
The bottom end of the fixed contact 12B of the fixed contact 2B, which is caulked and fixed to the front end of B, protrudes to the lower surface side and escapes.

Further, the tip of the laterally protruding portion at the upper end of the T-shaped piece 11b formed so as to extend from the other end of the upper piece of the terminal plate 11 has a convex flat portion 22 formed on the wall surface of the intermediate case 7. 'Is placed on the upper end surface.

The locking spring 13B and the terminal plate 11 of the terminal block 10B constitute a quick connection terminal which is a conductor connecting portion as in the case of the terminal block 10A, and when the intermediate case 7 is superposed on the second side case 1B. , An oblique downward groove 1 having a semicircular cross section provided on the vertical wall portion at the other end of the recess 9 of the intermediate case 7.
60 and this diagonal downward groove 160 as well as the second side case 1
When an electric wire is inserted through an electric wire insertion hole 16B formed by a diagonal downward groove 160 provided in the vertical wall at the other end of B, the core wire is locked by the locking piece 13a of the locking spring 13B and pressed. The core wire is pressed against the upper piece of the terminal board 11 by the piece 13b to electrically connect the electric wire and mechanically lock it.

The release handle 17 'is used to release the electric wire lock. In the release handle 17', the rotary shaft 18 provided on the lower side surface is the convex flat portion 22 of the intermediate case 7 like the release handle 17 described above. 'A shaft 38 rotatably supported in a shaft hole 20 provided in the second side case 1B and protruding from an inner wall surface of the second side case 1B is rotatably supported in a recess 37 formed on a side surface of the second side case 1B. When the operating portion 17a exposed to the outside of the body 1 is manually operated and rotated, the driving projection 19 provided at the lower end pushes the tip of one end of the locking piece 13a of the locking spring 13B to lock the locking piece. The locked state can be released by bending 13a. Reference numeral 21 'in FIG. 3 is a return spring for constantly biasing the release handle 17' in the clockwise direction.

As shown in FIG. 5, the intermediate case 7 is second with respect to the vertical wall portion 35 which is substantially parallel to the side walls of both cases 1A and 1B.
A bulging portion 30 that protrudes to the side case 1B side and abuts against the inner surface of the side wall of the second side case 1B is formed, and the wall hanging from the lower surface of the bulging portion 30 is the vertical wall 25.
A recess 34 surrounded by a side wall facing the B side, a bottom wall 31, a vertical wall 32 at one end, and a ceiling wall 33 is provided on the first side case 1A side. The intermediate case 7 is provided on the first side case 1A side.
When the butts are butted, the tip side portions of the fixed contacts 12A of the terminal block 10A assembled to the first side case 1A side are placed on the step surface 31a of the bottom wall 31 of the recess 34, and the ceiling wall 33 is It is arranged along the lower surface of the lateral wall 29 protruding from the inner side surface of the first-side case 1A. The fixed contact 2A fixed by caulking to the fixed contact 12A on the step surface 31a
A groove 31b is formed to allow the lower end portion of the groove to escape. Vertical wall 3
2 is formed with an opening 39 for inserting the free end of the movable contactor 4A corresponding to the fixed contact 2A into the recess 34.

The handle 6 is composed of an operating portion 6a, a rotating portion 6b and a handle shaft 6c, and the handle shaft 6c projecting in the center of both side surfaces of the rotating portion 6b is formed on the inner surface of the first side case 1A. Rotatably inserted into the shaft hole 49 formed in the second side case 1B and the shaft hole 49 formed in the inner surface of the second side case 1B, and held between the cases 1A and 1B. , 1B in a superposed and coupled state so as to face a window hole 50 opened on the upper surface of the body 1. A torsion spring 51 is attached to the handle shaft 6c, and the torsion spring 51 biases the handle 6 in the off operation direction at the on operation position.

The upper shaft 44a of the link 44 is rotatably inserted into a shaft hole 52 provided at the lower end of the rotating portion 6b as shown in FIG. 14, and is connected to the operating plate 43 through the link 44. There is.

The operating plate 43 is a bearing hole 4 provided on both sides of the center.
By inserting the lower shaft 44b of the link 44 into the 3a, the lower shaft 44b is connected to the handle 6 through the link 44, and is vertically movably arranged in the body 1.

The cross bar 40 is pivotally supported between the cases 1A and 1B by inserting shafts 40a protruding from both side surfaces of the upper part into shaft holes 52 and 52 formed on the inner side surfaces of the cases 1A and 1B. As shown in FIG. 6, a cut groove 54 for laterally fitting the side portion of the movable contactor 4A is formed on the side portion of the first side case 1A side slightly below the shaft 40a, and the lower second side case 1B. Cut grooves 55 into which the movable contacts 4B are fitted in the lateral direction are provided on the side portions on the side. And on the end face of the movable contact,
Stop pieces 130 protruding from the inner surfaces of the side walls of the intermediate case 7 and both cases 1A, 1B are engaged with the movable contacts 3A, 3B separated from the fixed contacts 2A, 2B, and their bottom portions are engaged. A recessed groove 131 that abuts against is formed in the width direction.

Here, the movable contactor 4A is made of a rigid conductive metal plate, is inserted into the cut groove 54 of the crossbar 40 from the side, and has a recess provided behind the cut groove 54 as shown in FIG. In the portion 54a, the rear lower surface and the recessed portion 54a
Coil spring 53 for contact pressure that is compressed between the bottom of the
The rear part is urged upward by means of which the movable contact 4A rotates about the opening edge of the cut groove 54 when the crossbar 40 rotates about the shaft 40a, and the movable contact 4A moves to the free end. The movable contact 3A fixed by crimping is opened / contacted with the corresponding fixed contact 2A.

The movable contactor 4B is made of a conductive spring thin plate material, and is pushed downward when the crossbar 40 is rotated counterclockwise in FIG. 14, so that the crossbar 40 is clocked. When the movable contact 3B is rotated in the direction, the movable contact 3B, which is caulked and fixed to the tip, is brought into contact with and separated from the fixed contact 2B by the bending and the return.

The lower end of the crossbar 40 is
It is pushed by the coil spring 62 which is compressed between the wall 63 and the wall 63 which is erected from the bottom of the first side case 1A, and the turning force in the clockwise direction in FIG. 14 is biased.

The first trip plate 41 has a shaft portion 41a, a protruding portion 41b protruding above the shaft portion 41a, and a shaft portion 41.
a side piece portion 41c having a surface orthogonal to the shaft portion 41a on the side of the second side case 1B of a, and an arm piece 41d integrally extended from one end to the upper end of the side piece portion 41c.
Both ends of the case are inserted into shaft holes 56, 56 provided on the inner side surfaces of the cases 1A, 1B, and are rotatably supported between the cases 1A, 1B. An engaging portion 57 with which one end (the right end in FIG. 14) of the plate 43 is disengaged.
And a receiving portion 88 that is driven by the driving portion 58a of the movable iron core 58 of the electromagnetic driving portion 47 at the upper end of the arm piece 41d.
Are formed respectively. Further, on the side surface of the second side case 1B below the side piece portion 41c, the receiving portion 5 which is pushed and moved by the facing portion 42a provided on the end surface of the lower end portion of the second trip plate 42.
9 is formed on the side surface of the receiving portion 59. The engaging portion 6 is provided on the side surface of the receiving portion 59 for engaging both ends of the torsion spring 60 for fitting the ring portion to the shaft portion 41a.
1 is provided. On the side surface of the first side case 1A below the side piece portion 41c, the first side which is opposed to the lower end of the bimetal 45 hanging from the conductive plate 71 that holds the electromagnetic drive unit 47 fixed and is pressed when the bimetal 45 is bent and displaced. A drive unit 69 is provided.

The second tripping plate 42 has a shaft hole 42b in the central portion.
In the first side case 1A, the shaft body 66 provided at the center of the end face of the separation wall 65, which is a partition integrally formed from the upper side of the first side case 1A to the vicinity of the bottom side, is inserted into the inner side surface of the first side case 1A. , 1B is rotatably supported between 1B,
On the lower end surface on the opposite side of the facing portion 42a, there is provided a receiving portion 68 which is driven by the driving portion 58a of the movable iron core 58 of the electromagnetic driving portion 48 shown in FIG. On the side surface of the upper side of the second tripping plate 42 on the side of the first side case 1A, the upper surface of the bimetal 46 standing upright from the rear end of the movable contactor 4B holding the electromagnetic drive 48 is opposed to the side surface of the bimetal 46. A second drive unit 70 is provided which is pushed when the curved displacement of the.

The conductive plate 71 made of a thin metal material is formed by being bent in an inverted L shape as shown in FIG. 1. The outer horizontal piece 71a has the electromagnetic drive portion 47 fixed thereto, and the outer horizontal piece 71a.
The horizontal piece of the upper end reverse L-shaped part of the bimetal 45 is welded and fixed to the step surface of the lower end of the inner horizontal piece 71b which is folded back in a U shape from the tip of a and made parallel to the outer horizontal piece 71a. is there.

In assembling the circuit breaker of this embodiment, first, the terminal block 10A is housed in the recess 8 of the first-side case 1A, and the release handle 17 is installed in a fixed position together with the return spring 21.

Further, the handle 6 is put in a predetermined position and the torsion spring 5
1, the common terminal T1 is housed in the housing portion 90 provided at the bottom of the other end of the body 1 as shown in FIG. 14, and the vertical piece 71c of the conductive plate 71 is attached to the partition wall 91 of the first side case 1A.
Separation formed on the inner side flat surface of the first side case 1A by arranging along the L-shaped gap between 92 and arranging the outer lateral piece 71a parallel to the upper surface of the upper lateral wall portion 92a of the partition wall 92. The electromagnetic drive unit 47 and the bimetal 45 are arranged on the left side wall surface (in FIG. 14) of the wall 65. At this time, the semi-circular rib 103 protruding from the inner side surface of the first side case 1A is fitted and positioned in the U-shaped bent portion of the outer lateral piece 71a of the conductive plate 71 and the inner lateral piece 71b.

The movable bar 4A is fitted into the cut groove 54 of the crossbar 40, and the coil spring 53 is recessed into the recess 5.
It is housed in 4a and rotatably arranged at a predetermined position of the first side case 1A. Further, the operating plate 43 is arranged so as to be connected to the handle 6 by a link 44.

Further, the electromagnetic drive portion 48 and the bimetal 46 are housed in the space between the partition wall 65 and the partition wall 92, and the selection terminal T2 together with the slide member 83 is constructed when the second terminal case 1B is butted. Inner storage 2
00 is stored in a section inside the first side case 1A (this storage position may be a position corresponding to either the upper conductive bar or the middle conductive bar). Further, the leg piece 83a of the slide member 83 is inserted into a slide groove (not shown) formed on the outer surface of the side wall of the first side case 1A through the insertion hole 208 to expose the protrusion 206 to the outside.

Further, the slanted upwardly inclined portion of the central portion of the movable contactor 4B is moved toward the other end of the first-side case 1A from the lower end of the separation wall 65 located slightly above the bottom of the first-side case 1A. Is arranged between the partition wall 95 which is parallel to and parallel to the parallel portion and which is inclined upward from the parallel portion and the bottom portion of the first side case 1A, and the free end side of the movable contactor 4B is located at the partition wall 1.
It is arranged in the space in which the fixed contact 12B is arranged via the four notches 14a.

At this time, the rear ends of the movable contacts 4B are sandwiched and fixed by ribs 96 protruding from the bottom surface of the parallel portion of the partition wall 95 and the bottom portion of the first side case 1A. At this time, the first side case 1A is placed in the U-shaped bent portion between the rear end portion and the inner lateral piece 80.
The semi-circular rib 103 'protruding from the inner surface of the
Positioned.

Further, the first trip plate 41 is attached to the torsion spring 60.
At the same time, the second tripping plate 41 is rotatably arranged at a fixed position, and the second tripping plate 41 is rotatably arranged at a fixed position.

In this way, as shown in FIG. 14, except for the intermediate case 7, the terminal block 10B housed in the recess 9 of the intermediate case 7, the release handle 17 'and its return spring 21', the first case 1A side. After being arranged and assembled, the intermediate case 7 in which the terminal block 10B, the release handle 17 'and the return spring 21' are assembled in the recess 9 is arranged so as to overlap the first side case 1A side.

Here, when the intermediate case 7 is arranged at a fixed position on the first side case 1A side, the free end side of the movable contactor 4A is arranged inside the recess 34 through the opening 39 of the vertical wall 32. , Fixed contactor 1 provided on the terminal block 10A
The front end side portion of 2A is placed on the step surface 31a of the bottom wall 31, and the shaft 36 is provided with the recess 3 of the release handle 17.
It will fit in 7.

On the other hand, the fixed contact 12B provided on the terminal block 10B is placed on the rib 26 on the bottom of the first side case 1A. Further, the lower surface of the downward step formed on the end of the intermediate case 7 is placed on the flat surface formed on the end wall of the first side case 1A.

In this state, the second side case 1B is superposed on the first side case 1A side and coupled. At this time, the claw-shaped hooking locking portions 101 at the tips of the elastic locking pieces 100 at the upper and lower ends of the four portions integrally projected from the first side case 1A to the second side case 1B side are located on the second side case 1B side. The first side case 1A and the second side case 1B are coupled and fixed to the corresponding hooked portion 102 having a protruding shape to form the body 1 (FIGS. 13 to 11, etc.). reference). This first
When the side cases 1A and 1B are disengaged from each other, the driver 151 is inserted into the second side case 1B through the release holes 150 that are opened corresponding to the hooked portions 102. By pushing the hook locking portion 101 of 100 ... upward to release the hooking state with the hooked portion 102,
The second side case 1B can be removed from the first side case 1A.

By attaching the second side case 1B, the shaft 40a of the crossbar 40 and the shaft portion 41a of the first tripping plate 41 are fitted in the shaft holes 52 and 56 provided on the inner surface of the second side case 1B. It is inserted rotatably.

The heads of the adjusting screws 77 and 77 'corresponding to the bimetals 45 and 46 are, as shown in FIG.
The opening 104 that opens on the upper surface and the opening 105 that opens on the bottom as shown in FIG. 13 respectively face the opening 104 and 105 so that the optimum operating point can be obtained during the operation test after assembly. The operation adjusting screws 77 and 77 'are screwed through to set the initial positions of the bimetals 45 and 46 in FIG. 4 (a).
To (b) in the same figure, and after the adjustment, the upper lid 106 and the lower lid 106 'are fitted to the respective portions of the body 1 by utilizing the elasticity thereof to cover the openings 104 and 105. To do.

Here, the bimetals 45 and 46 are arranged side by side so that the width direction of the body 1 is the width direction, and the bimetals 45 and 46 are partially overlapped with each other in the longitudinal direction of the body 1, so that the width of the body 1 can be made compact. ing. Further, since the displacement directions are set to the outer sides of each other, the initial positions where the bimetals 45 and 46 are not displaced are known in advance, and even when the bimetals 45 and 46 are displaced, the bimetals 45 and 46 are not closer than the initial positions. Work is easy.

That is, if they are displaced in the same direction, it is necessary to check the amount of displacement and dispose them.
Although the work of disposing 5, 46 is troublesome, the embodiment does not have such trouble.

Further, since the partition wall 65, which is a partition wall, exists between the bimetals 45 and 46, the space between the bimetals 45 and 46 can be narrowed, and the opening / closing mechanism 5 and the contact portion housed in the body 1 can be reduced. The installation space of is sufficiently large. Furthermore, since the braided wires 79 and 82 connected to the bimetals 45 and 46 are drawn from the vertical direction of the body 1,
This facilitates the work of routing the braided wires 79 and 82.

Thus, the inner housing 20 inside the other end of the body 1
0 and the accommodating portion 90 accommodate the selection terminal T2 and the common terminal T1, respectively, and one end of the body 1 extends over the end surface and both side surfaces of the body 1 so as to correspond to the terminals T1 and T2. The insertion portions 209a to 209c that are open at the end are formed.

Further, a pair of electric wire insertion holes 16A, 16B opened obliquely upward are formed in parallel at one end of the body 1.

Further, on the lower end surfaces of the wire insertion holes 16A and 16B, there are fixed contacts 2B arranged in the inner and lower compartments of the two compartments divided by the side walls of the cases 1A and 1B and the intermediate case 7. An exhaust hole 109 for exhausting gas generated by opening and closing the movable contact 3A and a locking hole 112 for mounting the body are opened, and the upper surface of the other end of the body 1 is arranged in the upper section. An exhaust hole 11 for exhausting gas generated by opening and closing the fixed contact 2A and the movable contact 3A obliquely upward.
0 opens.

Since the exhaust holes 109 and 110 are vertically separated and the directions facing the outside of the body 1 are separated from each other, the discharge directions of the arcs generated at the forced opening are different from each other, and the arcs of both poles are different from each other. It is possible to prevent a short circuit between the electrodes due to the mixture. Here, the exhaust hole 110 includes a rising rib 113 at the tip of the intermediate case 7 and ribs 114 and 114 protruding to the side surfaces of the release levers 17 and 17 '.
Also, since the laterally protruding wall 115 facing the opening of the exhaust hole 110 of the cases 1A and 1B guides the exhaust gas obliquely upward,
It is difficult to intersect with the exhaust gas exhausted from the exhaust hole 109 below.

Then, the wires on the load side are inserted into the wire insertion holes 16A and 16B, respectively, and connected to the respective terminal blocks 10A and 10B, and the lower conductive bar is inserted into the common terminal T1 in the width direction via the insertion portion 209c. To the selection terminal T2 via the insertion portion 209a or 209b.
By connecting the insertion portion in the width direction, the circuit breaker using this embodiment can be inserted in the electric circuit.

Next, the operation of the circuit breaker using this embodiment will be described with reference to FIGS.

FIG. 15 shows the off state. In this off state, the operating portion 6a of the handle 6 is exposed upside down through the opening 50, and the engagement between one end of the operating plate 43 and the first tripping plate 41 is shown. The combined state is in a disengaged state. The cross bar 40 is biased by the coil spring 62 so as to rotate clockwise in the figure, and the movable contact 4A inserted into the cut groove 54 of the cross bar 40 moves the free end upward. The movable contact 4B inserted into the cut groove 55 has its free end moved upward by its spring elastic force, and the movable contacts 3A and 3B provided at the respective free ends are It is in a state of being separated from the corresponding fixed contacts 2A and 2B.

When the operating portion 6a of the handle 6 is rotated clockwise in this state, the upper shaft 44a of the link 44 is pushed downward and the link 44 pushes down the operating plate 43 by the lower shaft 44b. By pushing down the operating plate 43, one end (the right end in the drawing) of the operating plate 43 hits the locking portion 57 of the first tripping plate 41, and the operating plate 43 rotates counterclockwise around that position as a rotation center. The other end (left end) of the operating plate 43 hits a protrusion 84 provided at the upper end of the crossbar 40 as shown in FIG. 16, and rotates the crossbar 40 counterclockwise against the spring bias.

By this rotation, the cut groove 55 of the crossbar 40 is formed.
The movable contactor 4B inserted into the flexible contact 4B is bent in the direction of moving the free end downward, and the movable contact 3B at the free end is brought into contact with the fixed contact 2B. Further, the movable contactor 4A inserted into the cut groove 54 rotates counterclockwise to bring the movable contact 3A at its free end into contact with the fixed contact 3B. This contact is delayed from the contact of the movable contact 3B with the fixed contact 2B.

Since the movable contactor 4B obtains contact pressure by its own elasticity, no spring means for contact pressure is required, and since it is not necessary to connect the electric path by using a braided wire, parts are incorporated. No work or braided wire connection work is required, improving productivity.

When the handle 6 is further rotated clockwise, the position of the lower shaft 44b of the link 44 and the handle 6 are rotated.
The upper shaft 44a moves to the left as shown in FIG. 17 from the line connecting the center of rotation of the handle 6, and in this state, the torsion spring 51 of the handle 6 and the coil spring 62 for urging the crossbar 44,
Further, the spring force or the like of the movable contactor 4B is balanced and the latched state between the one end of the actuating plate 43 and the locking portion 57 of the first tripping plate 41 is maintained, and the ON state of FIG. 17 is maintained. FIG. 18 shows the ON state with the trip plates 41 and 42 removed.

When the operating portion 6a of the handle 6 is turned counterclockwise in the ON state, the upper shaft 44a of the link 44 is rotated.
Is moved to the right above the line connecting the rotation center of the handle 6 and the lower shaft 44b, so that the left end of the operating plate 43 and the locking portion 57 of the first tripping plate 41 are latched. The state is released, and the crossbar 40 is rotated clockwise by the biasing force of the coil spring 62, and the handle 6 is rapidly rotated back to the off side by the biasing force of the torsion spring 51. When the crossbar 40 is rotated clockwise, the movable contactor 4A is rotated clockwise to move the free end upward so that the movable contact 3A is separated from the fixed contact 2A. Further, the downward movement of the movable contactor 4B disappears, and the spring force restores the original state, so that the movable contact 3B at the free end is separated from the fixed contact 2B. This separation is delayed compared with the separation of the movable contact 3A from the fixed contact 2A. This delay is the same as in the forced opening described later.

Since the opening / closing of the contact portions of both poles is delayed as described above, the arc generated when the contacts are opened / closed is only the movable contact 4A on the rigid body side, and the movable contact made of a spring material. It is possible to prevent consumption due to the 3B arc.

Further, the arcs generated at the contact portions of both poles are generated in the respective arrangement sections, and the exhaust directions of the exhaust holes 109 and 110 are different, so that the inter-electrode short circuit due to the arc can be prevented.

Further, the stoppers 130 ... Formed in both the cases 1A and 1B and the intermediate case 7 are engaged with the concave groove 131 formed in the width direction of the tip end surface of the crossbar 40 which rotates when the contact portion is opened. Since it abuts on the bottom of the concave groove 131, there is no risk that the arc generated in one compartment will sneak from the crossbar 40 side on the back side of the body 1 and enter the other compartment, and the arc inside the body 1 will be eliminated. Prevent short circuit between electrodes.

Further, the fixed contact 2 of the upper fixed contact 12A
The space near A is widened to the space between the side walls of both cases 1A and 1B by the bulging portion 30 of the intermediate case 7, and the space near the fixed contact 2B of the lower fixed contactor 12B is formed between both cases 1A and 1B. Since it is a wide space between the side walls,
It is possible to reduce the gas pressure due to the arc generated when the respective contact parts are separated, and it is possible to prevent cracks and breakage of both cases 1A and 1B due to the gas pressure.

Further, since the intermediate case 7 is formed of a resin material containing Mg hydroxide, it is possible to oxidize carbon generated when the contact portion is opened and prevent insulation deterioration due to carbon.

Now, in the ON state shown in FIG. 17,
When an overcurrent flows through the load, the bimetals 45 and 46 generate heat due to the overcurrent and are curvedly displaced. Here, the bimetal 45 hung from above is displaced so that the lower end moves leftward in the figure, and the bimetal 46 erected upright.
Is displaced so that the upper end moves to the right, the lower end of the bimetal 45 pushes the first drive portion 69 of the first tripping plate 41 leftward, and the upper end of the bimetal 46 moves to the second pull, as shown in FIG. The second drive unit 70 of the removal plate 42 is pushed to the right.
That is, the free ends of both bimetals 45 and 46 are displaced in the direction away from each other. Due to this displacement, the first and second tripping plates 4
1, 42 rotate clockwise, but at this time, the facing portion 42a of the second tripping plate 42 pushes the receiving portion 59 of the first tripping plate 41 to apply a clockwise turning force to the first tripping plate 41. give.

Since the bimetals 45 and 46 are energized in opposite directions to each other, when a large current flows, the bimetals 45 and 46 generate magnetic forces in directions away from each other. Therefore, the curved displacement of the bimetals 45 and 46 can be made quick, and as a result, forced opening can be made faster. This operation is also effective during forced opening due to a short-circuit current, which will be described later.

When the first tripping plate 41 is rotated clockwise, the latched state between the locking portion 57 and one end (right end) of the operating plate 43 is released, and the operating plate 43 moves the lower shaft 44b of the link 44. It will rotate clockwise around. Therefore, the other end (left end) of the operating plate 43 causes the crossbar 40 to move.
, The crossbar 40 is rotated clockwise by the spring force of the coil spring to return the movable contacts 4A and 4B to the off state as shown in FIG.
3B is separated from the fixed contacts 2A and 2B, respectively.

After that, the bimetals 45, 4 are cut off by disconnecting the electric circuit.
6 returns to the original state, the first tripping plate 41 is returned to the original position by the biasing force of the torsion spring 60, and at the same time, the receiving portion 59 pushes and moves the facing portion 42a of the second tripping plate 42. The second trip plate 42 is returned to its original position. Further, the handle 6 is rotated in the OFF direction (counterclockwise direction) by the bias of the torsion spring 51.

When an excessive current such as a short-circuit current flows in the ON state, a magnetic force is generated in each fixed iron core 74 of the electromagnetic drive units 47 and 48 to attract and rotate the corresponding movable iron core 58. . As a result, as shown in FIG.
The drive portion 58 a of the movable iron core 58 of the electromagnetic drive portion 47 pushes the receiving portion 89 of the first trip plate 41, and the electromagnetic drive portion 48.
The drive portion 58a of the movable iron core 58 pushes the receiving portion 68 of the trip plate 42 to rotate them in the clockwise direction.

When the first tripping plate 41 is rotated in the clockwise direction similarly to when the overcurrent flows, the engaging portion 57 and the operating plate 4 are moved.
The latched state with one end (right end) of 3 is released, and the operating plate 4
3 rotates clockwise about the lower shaft 44b of the link 44. Therefore, the regulation of the crossbar 40 by the other end (left end) of the operating plate 43 is eliminated, the crossbar 40 is rotated clockwise by the spring force of the coil spring 62, and the movable contacts 4A and 4B are returned to the off state. The movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively.

Thereafter, the electromagnetic circuits 47, 4
When the magnetic force is no longer generated in each fixed iron core 74 of No. 8, each movable iron core 58 returns to the original state by the spring force of the leaf spring 73,
The first tripping plate 41 is returned to the original position by the biasing force of the torsion spring 60, and at the same time, the second tripping plate 44 is pushed and moved back to the original position. Further, the handle 6 is rotated in the OFF direction (counterclockwise direction) by the bias of the torsion spring 51.

Since the electromagnetic drive units 47 and 48 are arranged so that the movable iron cores 58 are attracted to the corresponding fixed iron cores 74 in opposite directions, the movable iron cores 58 are vibrated even when vibration is applied. One of the movable iron cores moves in the direction of being attracted by the vibration and the other of the movable iron cores in the direction of being oppositely attracted. Since it can be obtained only by the movement of, the force for pulling out the first trip plate 41 against the biasing force of the torsion spring 60 cannot be obtained, and as a result, malfunction due to vibration can be prevented.

(Embodiment 2) In the electromagnetic drive unit 47 (48) of this embodiment, the movable iron core 58 is used.
The leaf spring 73, which is rotatably supported on the fixed iron core 7, and which is a return means, and the corresponding support structure on the fixed iron core 7 side, are different from those of the first embodiment, and as shown in FIG. 73 is formed in a U-shape, and insertion holes 73b and 73b for inserting and fixing the protrusions 58b and 58b formed on the inner side surface of the movable iron core 58 on the free end side to the central piece arranged on the lower side in the drawing by caulking are provided. Protruding pieces 73e are formed at the tips of both side pieces 73c, 73c, which are formed by bending in a direction perpendicular to the plate surface. On the other hand, both side pieces 74a, 74a of the fixed iron core 74
The protrusion 74d is integrally provided on the upper end surface of the protrusion upward, and the protrusion 74e, which is a locked portion formed on the inner side surfaces of the protrusions 74d and 74d on both sides, is formed on the protrusion 73e of the side piece 73c of the leaf spring 73. The leaf spring 73 is fixed by being inserted into and locked by the locking hole 73f which is a locking portion.

Thus, the leaf spring 73 of the electromagnetic drive unit 47 (48) which constitutes the electromagnetic trip device of this embodiment has one end fixed to the free end of the movable iron core 58 and the other end as shown in FIG. By fixing to the upper part of the fixed iron core 74 near the rotation center, the fixed iron core 74 and the movable iron core 58 are made into blocks, and the rotation center (upper edge in the figure) of the movable iron core 58 is surely fixed. It can be brought into contact with the side piece 74a. Therefore, the center of rotation of the movable iron core 58 does not easily come off from the side piece 74a of the fixed iron core 74 even if there is vibration or shock, beats for load current including harmonics can be reduced, and malfunctions due to inrush current can be easily prevented. In addition to that, the leaf spring 73 is fixed to the fixed core 74 and the movable core 5.
By arranging it in the space formed by 8, the compactness is achieved. Furthermore, since the one end side of the leaf spring 73 is fixed to the free end side of the movable iron core 58, the movable iron core 58 can be held in a state of being reliably separated from the fixed iron core 7 side, and malfunctions due to vibration and shock can be prevented. I made it easier.

The other components that are the same as those in the first embodiment are given the same numbers and their explanations are omitted.

(Third Embodiment) In the electromagnetic drive unit 47 (48) of the present embodiment, the movable iron core 58 is used.
The leaf spring 73 for rotatably supporting the fixed core 7 and the supporting structure on the side of the fixed core 74 corresponding thereto are reversed from those in the second embodiment. That is, as shown in FIG.
Is formed in a U shape, and a protrusion 5 formed on the inner side surface of the movable iron core 58 on the side of the center of rotation is formed on the center piece arranged on the upper side in the figure.
8b is inserted and an insertion hole 73b for caulking and fixing is formed,
A projecting piece 73e bent at a right angle to the plate surface is provided at the tip of each of the side pieces 73c, 73c. On the other hand, fixed iron core 7
4, a step surface is provided on the inner surface of the lower portion of the both side pieces 74a, and a projection 74e is integrally projected on the step surface.
The leaf spring 73 is firmly held by inserting and locking the protrusion 74e into the locking hole 73f formed in the 4e.

The other components that are the same as those in the first embodiment are given the same numbers and their explanations are omitted.

Thus, the leaf spring 73 of the electromagnetic drive unit 47 (48) constituting the electromagnetic trip device of this embodiment has one end fixed to the center of rotation of the movable iron core 58 and the other end shown in FIG. By fixing the movable iron core 58 to the fixed iron core 74 side on the free end side as described above, the fixed iron core 74 and the movable iron core 58 are made into a block, and the rotation center of the movable iron core 58 is surely secured to the side piece of the fixed iron core 74. Can be brought into contact with. Therefore, the center of rotation of the movable iron core 58 does not easily come off from the side piece 74a of the fixed iron core 74 even if there is vibration or shock, beats for load current including harmonics can be reduced, and malfunctions due to inrush current can be easily prevented. Further, in addition to this, the leaf spring 73 is arranged in the space formed by the fixed iron core 74 and the movable iron core 58 to achieve compactness.

Further, it is easy to prevent the center of rotation of the movable iron core 58 from being lifted up when the movable iron core 58 is attracted to the fixed iron core 74 side, and at the same time, the beat against the load current including harmonics can be reduced. Further, it becomes easy to prevent the malfunction of the inrush current.

(Fourth Embodiment) In the electromagnetic drive unit 47 (48) of the present embodiment, the movable iron core 58 is used.
A leaf spring 73 that rotatably supports the fixed core 74 is attached to the outside. That is, as shown in FIG. 25, the leaf spring 73 is formed in a U shape, and both side pieces 73c,
Insertion holes 73b, 73b for bending the vicinity of the base of 73c at a right angle and inserting projections 58b, 58b formed on both sides of the outer surface in the vicinity of the center of rotation of the movable iron core 58 into the upright center piece by swaging. And both side pieces 73c, 7
At the tip of 3c, both side pieces 74 of the fixed iron core 74 on the rotation center side are provided.
A locking hole 73g for fixing to the upper surface of the fixed iron core 74 by inserting and caulking a projection 74e protruding from the upper surface of a, 74a is formed.

The other components that are the same as those in the first embodiment are given the same numbers and their explanations are omitted.

Thus, one end of the leaf spring 73 of the electromagnetic drive unit 47 (or 48) which constitutes the electromagnetic trip device of this embodiment is fixed to the center of rotation of the movable iron core 58, and the other end thereof is shown in FIG.
6, the fixed core 74 on the free end side of the movable core 58 is shown.
By fixing to the side, the fixed iron core 74 and the movable iron core 58
It is possible to block and the rotation center of the movable iron core 58 and to surely abut the side piece of the fixed iron core 74. Therefore, even if there is vibration or shock, the movable iron core 58
The center of rotation of the is not easily disengaged from the side piece 74a of the fixed iron core 74, the beat against the load current including harmonics can be reduced, and the malfunction due to the inrush current can be easily prevented.

Further, the elasticity of the leaf spring 73 is easily obtained, and the movable iron core 58 can be surely biased in the direction away from the fixed iron core 7. Further, since the central side of the leaf spring 73 is fixed to the outer side surface of the movable iron core 58, when the movable iron core 58 is attracted to the fixed iron core 74, the movable iron core 58 moves outside the fixed position of the leaf spring 73. As a result, the positioning accuracy of the movable iron core 58 at the initial position can be improved.

(Fifth Embodiment) In the electromagnetic drive unit 47 (48) of the present embodiment, the movable iron core 58 is used.
Similarly to the fourth embodiment, a leaf spring 73 that rotatably supports the fixed core 74 is attached to the outside. That is, as shown in FIG. 27, the leaf spring 73 to be used is formed by bending both side pieces 73c so as to have a plate surface perpendicular to the plate surface of the central piece, and the bases of the both side pieces 73c are once opposite to the tip direction. After projecting in the direction, it is folded back into a U shape to form a substantially U shape, and in the figure, the protrusions 58b, 58b formed on the outer side surface near the center of rotation of the movable iron core 58 are inserted and fixed by caulking. The insertion holes 73b, 73b are bored, and the fixed iron core 74 on the rotation center side is attached to the tips of the side pieces 73c, 73c.
74e protruding from the outer surface of both side pieces 74a, 74a
Locking holes 73f for inserting and locking and fixing on the upper surface of the fixed iron core 74.

The other components that are the same as those in the first embodiment are given the same numbers and their explanations are omitted.

Thus, the leaf spring 73 of the electromagnetic drive unit 47 (48) constituting the electromagnetic trip device of this embodiment has one end fixed to the center of rotation of the movable iron core 58 and the other end shown in FIG. By fixing the movable iron core 58 to the fixed iron core 74 side on the free end side as described above, the fixed iron core 74 and the movable iron core 58 are made into a block, and the rotation center of the movable iron core 58 is surely located on the fixed iron core 74 side. It can be brought into contact with the piece 74a. Therefore, even if there is vibration or shock, the movable iron core 5
It is difficult for the center of rotation of 8 to come off from the side piece 74a of the fixed iron core 74, the beat against the load current including harmonics can be reduced, and the malfunction due to the inrush current can be easily prevented.

Further, the leaf spring 7 is formed by folding back the U-shape.
3 makes it easier to obtain elasticity, and the movable iron core 58 can be surely biased in the direction away from the fixed iron core 74.

(Sixth Embodiment) In the electromagnetic drive unit 47 (48) of the present embodiment, the movable iron core 58 is used.
29 is a T-shaped plate spring 73 for rotatably supporting the fixed iron core 74 side, and the side piece 74 of the fixed iron core 74 has a portion extending from the middle portion to the tip of the horizontal piece.
a and 74a are bent at right angles to the plate surface of the horizontal piece to form side pieces 73c and 73c. As shown in FIG. 30, the horizontal piece is used as the center of rotation of the movable iron core 58. In the figure parallel to the axis of the movable iron core 58, both side pieces 73c, 73c are arranged along the outer surface of the movable iron core 58 along the upper end edge of the movable iron core 58, and the both side surfaces of the movable iron core 58 and the both side pieces 74a of the fixed iron core 74 are arranged. Along the outer surface of 74a,
The protrusion 74e projecting to a position near the center of rotation of the outer surfaces of the both side pieces 74a, 74a is inserted into a locking hole 73f formed at the tip of the side piece 73c to lock the projection 74e. The fixed iron core 74 is fixed to the fixed iron core 74 by
A vertical piece located in the middle of both side pieces 74a, 74a is hung along the outer surface of the movable iron core 58, and a protrusion 58b protruding near the free end of the movable iron core 58 is formed at the tip of the vertical piece. The movable iron core 58 is rotatably held by being inserted into the inserted insertion hole 73b and caulking the protrusion 58b.

The other components that are the same as those in the first embodiment are given the same numbers and their explanations are omitted.

Thus, one end of the leaf spring 73 of the electromagnetic drive unit 47 (or 48) which constitutes the electromagnetic trip device of this embodiment is fixed to the center of rotation of the movable iron core 58, and the fixed iron core 7 is fixed.
It is possible to block the 4to movable iron core 58 and the rotation center of the movable iron core 58 and to surely contact the side piece 74a of the fixed iron core 74. Therefore, the center of rotation of the movable iron core 58 does not easily come off from the side piece 74a of the fixed iron core 74 even if there is vibration or shock, beats for load current including harmonics can be reduced, and malfunctions due to inrush current can be easily prevented.

Furthermore, since the T-shaped leaf spring 73 as described above is used, the leaf spring 73 can be easily elasticized, and the movable iron core 58 can be surely biased in the direction away from the fixed iron core 74.

The leaf spring 7 can be obtained by simply inserting and locking the protrusions 231a provided on the outer surfaces of both side pieces of the fixed iron core 74 into the insertion holes 230a at the bending tip of the horizontal piece with respect to the fixed iron core 74 side.
Since 3 can be fixed to the fixed iron core 74 side, the mounting work can be easily performed.

(Embodiment 7) In the above-described Embodiment 6, the leaf spring 73 is T-shaped and has a structure in which the bending tip of the horizontal piece is locked to the outer surface of both side pieces of the fixed iron core 74 near the center of rotation. However, as the leaf spring 73 of the present embodiment, it is formed in a T shape as shown in FIG.
The length of the horizontal piece in both end directions is formed to be substantially the same as the width of the movable iron core 58, and the length from the upper end to the lower end of the central vertical piece is formed in the height direction of the movable iron core 58. Then, extend both ends of the horizontal piece parallel to the vertical piece, and extend the tip of the extended piece at a right angle further outward from the position slightly above the lower end of the vertical piece, As shown in FIG. 32, a protrusion 58 is provided at the central portion of the outer surface of the movable iron core 58 near the free end thereof, by using a side piece 73c formed by bending the vicinity of the base portion at a right angle.
It is fixed to the movable iron core 58 by inserting b into the insertion hole 73b provided in the lower part of the vertical piece and caulking it.
c and 73c are arranged along the side surfaces of the movable iron core 58 along the outer surfaces of the both side pieces 74a and 74a of the fixed iron cores 74 and 74, and the protrusions 74e protruding from the outer surfaces of the both side pieces 74a and 74a are provided. By being inserted and locked in the locking hole 73f of the side piece 73c, the side piece 73c is fixed to the fixed core 74 side.

The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Thus, one end of the leaf spring 73 of the electromagnetic drive unit 47 (or 48) constituting the electromagnetic trip device of this embodiment is fixed to the rotation center side of the movable iron core 58, and the fixed iron core 7 is fixed.
It is possible to block the movable core 58 and the movable iron core 58 into blocks, and reliably bring the center of rotation of the movable iron core 58 into contact with the side piece of the fixed iron core 74. Therefore, even if there is vibration or impact, the center of rotation of the movable iron core 58 is the side piece 74 of the fixed iron core 74.
It is difficult to deviate from “a”, beat can be reduced for load current including harmonics, and malfunctions due to inrush current can be easily prevented.

Furthermore, since the T-shaped leaf spring 73 as described above is used, the leaf spring 73 can be easily elasticized, and the movable iron core 58 can be surely biased in the direction away from the fixed iron core 7.

Further, by simply inserting and locking the projections 231a provided on the outer surfaces of the both side pieces 74a, 74a of the fixed iron core 74 into the insertion holes 73f of the bent end portions of the above-described extending pieces with respect to the fixed iron core 74 side, Since the spring 73 can be fixed to the fixed iron core 74 side, the mounting work can be easily performed.

( Reference Example ) In this reference example , as shown in FIG. 33, a vertical piece including a connecting piece of a fixed iron core 74 and a vertical piece bent from this vertical piece to the outside of the free end of the movable iron core 58. An iron plate having a flat plate 75 that extends as a horizontal piece is provided, and the leaf spring 73 has a base piece and two L-shaped pieces 7 extending upward from the outer edge of the base piece.
3h and a vertical piece 73i extending upward from the inner piece. As shown in FIG. 34, the rotation center side of the movable iron core 58 is the base piece side between the vertical piece 73i and the L-shaped piece 73h. And a protrusion 58b projecting on the surface of the fixed iron core 74 of the movable iron core 58 and in the vicinity of the free end side is inserted into the locking hole 73j provided at the tip of the vertical piece 73i from the inside. Then, the upper portions of the vertical piece portions of the L-shaped pieces 233 on both sides are fitted into the recesses 74f that are open to the outside by vertical penetration provided on both side portions of the flat plate 75 of the iron plate, and the horizontal piece of each L-shaped piece 73h. By placing the portion 73k on the horizontal piece of the iron plate and locking the notch 73l provided on the inner edge of the horizontal piece portion 73k of both L-shaped pieces 73h, 73h with the projection 74g protruding on the horizontal piece of the iron plate. It is fixed to an iron plate and holds the movable iron core 58 rotatably.

Thus, the leaf spring 73 of the electromagnetic drive unit 47 (or 48) which constitutes the electromagnetic trip device of the present reference example has one end side fixed to the center of rotation of the movable iron core 58 and the fixed iron core 74 is integrated. Since the fixed iron core 74 and the movable iron core 58 are blocked by being fixed to the iron plate formed in the above, the rotation center of the movable iron core 58 can be reliably brought into contact with the side piece 74a of the fixed iron core 74. is there. Therefore, the center of rotation of the movable iron core 58 does not easily come off from the side piece 74a of the fixed iron core 74 even if there is vibration or shock, beats for load current including harmonics can be reduced, and malfunctions due to inrush current can be easily prevented. Further, the length of the leaf spring 73 can be made sufficiently long, and the elasticity can be easily obtained.

[0132]

According to the invention of claim 1, a fixed iron core formed in a substantially U shape by two side pieces and a connecting piece connecting these side pieces, and two side pieces and a connection of the fixed iron core. A movable iron core, which is arranged so as to sandwich the current-carrying electric path that penetrates the space formed by the piece and a fixed iron core, and has one end side as a rotation center point and the other end side as a free end. And a return member for returning the free end side of the movable iron core from the rotation center point in the direction away from the fixed iron core, and the free end of the movable iron core is the rotation center when an excessive current flows in the energizing circuit. In an electromagnetic trip device of a circuit breaker that is attracted to the fixed core side around a point to release a latch and forcibly open a contact, the return member is attached to the movable core on one side and is movable. Abut the center of rotation of the iron core on the two side pieces of the fixed iron core. Formed of a leaf spring for holding the movable iron core in a state in which the fixed and the other side of the leaf spring
Attached to both sides of the iron core and one side of the leaf spring
Is attached to the inner surface of the movable iron core between the two pieces of the fixed iron core.
Since, with thinning of the return member can be achieved it is possible to narrow the spacing between the movable core and the fixed iron core, the electromagnetic tripping downsizing of the apparatus itself, I follow, incorporating the electromagnetic trip device Since the circuit breaker can be downsized and the center of rotation of the movable iron core is brought into contact with the two side pieces of the fixed iron core, the suction force of the movable iron core can be increased. . Also, fix the other side of the leaf spring
Blocks of fixed core and movable core by attaching to the core
The center of rotation of the movable iron core can be securely fixed.
It can be brought into contact with the side piece of the constant iron core, which causes vibration.
Even if there is a shock or impact, the center of rotation of the movable core is on the side of the fixed core.
It does not easily come off from one side, and
It is easy to prevent malfunction due to inrush current.
There is an effect. In addition, fix the other side of the leaf spring to the fixed iron core.
While attaching to both side pieces of the
By attaching to the inner surface of the movable iron core between the two pieces of the core,
A spring is placed in the space formed by the movable core and the fixed core.
The result is that it can be made more compact.
There is a fruit.

According to the invention of claim 2, in the invention of claim 1 , one side of the leaf spring is attached to the free end side of the movable iron core. Therefore, in addition to the effect of claim 1 , the free end of the movable iron core is provided. It is easy to hold the side securely separated from the fixed core,
This has the effect of making it easier to prevent malfunctions due to vibration and shock.

[0134] The invention of claim 3 is the invention of claim 1, since the one side of the leaf spring and attached to the pivot center side of the movable iron core, in addition to the effects of 請 Motomeko 2, the movable iron core There is an effect that it is easy to prevent the center of rotation of the movable iron core from being lifted up when attracted to the fixed iron core, beat can be reduced for load current including harmonics, and malfunction due to inrush current can be easily prevented.

The invention of claim 4 relates to claim 2 or claim 3.
In the invention, since the other side of the leaf spring is attached to the movable iron core at a position corresponding to the free end side or the rotation center point side of the movable iron core with the fixed iron core distant from the one side, There is an effect that the elasticity of the leaf spring can be easily obtained, and the movable core can be surely biased in the direction away from the fixed core.

According to the fifth aspect of the present invention, there is provided a fixed iron core formed in a substantially U shape by two side pieces and a connecting piece for connecting these side pieces, and two side pieces and a connecting piece of the fixed iron core. A current-carrying electric path that penetrates the space formed, and a movable iron core that is disposed so as to sandwich the current-carrying electric path between a fixed iron core and has one end as a rotation center point and the other end as a free end. A return member for returning the free end side of the movable iron core from the fixed iron core in a direction away from the fixed iron core, and the free end of the movable iron core is set to the rotational center point when an excessive current flows in the energization circuit. In the electromagnetic trip device of the circuit breaker which is attracted to the fixed core side at the center to release the latch and forcibly open the contacts, the return member is attached to the movable core on one side and Place the center of rotation on the two side pieces of the fixed iron core. The formed of a leaf spring for holding the armature in a state, the fixed and the other side of the leaf spring
Attached to both sides of the iron core and one side of the leaf spring
Is attached to the outside of the movable iron core while straddling the movable iron core , the return member can be made thin, and the distance between the movable iron core and the fixed iron core can be narrowed. downsizing itself, I follow, the electromagnetic tripping downsizing of the circuit breaker incorporating a device, also, is abutted against the pivot center of the movable core into two side pieces of the fixed iron core Therefore, there is an effect that the suction force of the movable iron core can be increased. Also, fix the other side of the leaf spring to the fixed iron.
Fixed core and movable core are made into blocks by attaching to the core
And the center of rotation of the movable iron core is securely fixed.
It can be brought into contact with the side pieces of the iron core, which can
Even if there is a shock, the center of rotation of the movable core is a side piece of the fixed core.
Does not easily come off, and growls against load current including harmonics.
It can be reduced and it becomes easier to prevent malfunction due to inrush current.
There is an effect. Furthermore, fix the other side of the leaf spring to the fixed core.
While attaching to both side pieces, one side of the leaf spring is a movable iron core
Since it was attached to the outside of the movable iron core across the
From the position where the movable iron core is attached when it is sucked into the iron core
Also becomes difficult to move outward, and the initial position of the movable iron core is set
This has the effect of improving the positioning accuracy.

According to the invention of claim 6, in the invention of claim 5 , one side of the leaf spring is attached to the side of the center of rotation of the movable iron core. Therefore, in addition to the effect of the fifth aspect , the movable iron core is There is an effect that it is easy to prevent the center of rotation of the movable iron core from being lifted up when attracted to the fixed iron core, beat can be reduced for load current including harmonics, and it is possible to easily prevent malfunction due to inrush current.

According to a seventh aspect of the invention, in the invention of the sixth aspect , the leaf spring is attached to the movable iron core by protruding from both side pieces of the fixed iron core to the outside of the outer surface of the movable iron core and folding back. Therefore, there is an effect that elasticity can be easily obtained and the material of the leaf spring for obtaining elasticity is improved.

According to an eighth aspect of the present invention, in the invention of the fifth aspect , one side of the leaf spring extends from the center of rotation of the movable iron core to the free end thereof at substantially the center between both side pieces of the fixed iron core. Since it is taken out and attached to the free end side of the movable core, there is an effect that the elasticity of the leaf spring can be easily obtained, and the movable core can be surely biased in the direction away from the fixed core.

The invention of claim 9 is the invention of claim 5 or claim 8.
In the invention, the other side of the leaf spring is attached to both side pieces of the fixed iron core corresponding to the free end side of the movable iron core, and the outer surface of the other side of the leaf spring on the free end side of the movable iron core is attached. Since the substantially central portion between the one side and the other side of the leaf spring is extended to the rotation center point side of the movable iron core,
There is an effect that the elasticity of the leaf spring can be easily obtained, and the movable core can be surely biased in the direction away from the fixed core.

The invention according to claim 10 is any one of claims 1 to
In the invention of claim 9 , two leaf pieces facing the outer surface or the inner surface of the both side pieces of the fixed iron core are provided on the other side of the leaf spring, and the two leg pieces are provided with engaging portions and both sides of the fixed iron core are provided. Since the locked portion to be locked by the locking portion is formed on the outer surface or the inner surface of the piece, there is an effect that the work of attaching the leaf spring to both side pieces of the fixed iron core becomes easy.

The invention of claim 11 relates to claims 1 to.
In the invention of 10, the two side pieces are formed so as to be gradually inclined toward the connecting piece from the end surface of the movable iron core on the rotation center point side to the end surface of the movable iron core on the free end side. If the center of rotation of the movable iron core is brought into contact with the two side pieces of the fixed iron core and the movable iron core is arranged in parallel with the connecting piece of the fixed iron core, the free end side of the movable iron core is 2 times the fixed iron core.
Can be separated from one side piece, claim 1 to claim
In addition to the effect of item 10 , there is an effect that the free end side of the one movable iron core that can be made more compact does not have to be inclined with respect to the connecting piece, and the size can be made compact.

[Brief description of drawings]

FIG. 1A is a perspective view of one electromagnetic drive unit according to the first embodiment of the present invention. (B) is an exploded perspective view of one electromagnetic drive part same as the above.

FIG. 2A is a perspective view of the other electromagnetic drive unit of the above. (B) is an exploded perspective view of the other electromagnetic drive part same as the above.

FIG. 3 is an exploded perspective view of an entire circuit breaker using the same as above.

FIG. 4 is an explanatory view of the adjustment of the above bimetal.

FIG. 5 is an enlarged perspective view of the intermediate case of the above.

FIG. 6 is an enlarged exploded perspective view of the above-mentioned crossbar portion in which a part thereof can be omitted.

FIG. 7 is a side view of a circuit breaker using the same as above.

FIG. 8 is a rear view of a circuit breaker using the same as above.

FIG. 9 is a perspective view of a circuit breaker using the same as above.

10 is a sectional view taken along line AA of FIG. 7 above.

11 is a sectional view taken along line BB of FIG. 7 above.

FIG. 12 is a top view of a circuit breaker using the same as above.

FIG. 13 is a bottom view of a circuit breaker using the same as above.

FIG. 14 is a side view showing a state where members are assembled to the first side case of the above.

FIG. 15 is an explanatory diagram of the above-described off state.

FIG. 16 is an explanatory diagram of a state in the process of shifting to the ON state in the above.

FIG. 17 is an explanatory diagram of the above-described ON state.

FIG. 18 is an on-state explanatory view showing a state in which the trip plate is removed.

FIG. 19 is a state explanatory view of a trip operation due to an overcurrent in the above.

FIG. 20 is a state explanatory diagram of an instantaneous interruption state due to an excessive current in the above.

FIG. 21 is an exploded perspective view of an electromagnetic drive unit according to the second embodiment of the present invention.

FIG. 22 is a perspective view of the electromagnetic drive unit of the above.

FIG. 23 is an exploded perspective view of an electromagnetic drive unit according to the third embodiment of the present invention.

FIG. 24 is a perspective view of the above electromagnetic drive unit.

FIG. 25 is an exploded perspective view of an electromagnetic drive unit according to a fourth embodiment of the present invention.

FIG. 26 is a perspective view of the electromagnetic drive unit of the above.

FIG. 27 is an exploded perspective view of an electromagnetic drive unit according to the fifth embodiment of the present invention.

FIG. 28 is a perspective view of the electromagnetic drive unit of the above.

FIG. 29 is an exploded perspective view of an electromagnetic drive unit according to the sixth embodiment of the present invention.

FIG. 30 is a perspective view of the electromagnetic drive unit of the above.

FIG. 31 is an exploded perspective view of an electromagnetic drive unit according to a seventh embodiment of the present invention.

FIG. 32 is a perspective view of the electromagnetic drive unit of the above.

FIG. 33 is an exploded perspective view of an electromagnetic drive unit according to a reference example of the present invention.

FIG. 34 is a perspective view of the electromagnetic drive unit of the above.

[Explanation of symbols]

45 bimetal 47 Electromagnetic drive 58 movable iron core 74 Fixed core 74a side piece 74c inclined surface 73 leaf spring 73a central piece 73c Side piece

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Taka ▼ Shinji Yama Inside 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Takuya Kagawa Inside 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Inventor Kenichiro Shimizu 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Toshihiro Oido, 1048, Kadoma, Kadoma City, Osaka Prefecture (72) Takanobu Tanaka Osaka Prefecture 1048 Kadoma, Kadoma-shi, Matsushita Electric Works Co., Ltd. (72) Inventor, Hatsuo Mizuno 1048 Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Works, Inc. (72) Yoshiya Nakamichi 1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works within Co., Ltd. (56) references JitsuHiraku Akira 48-6561 (JP, U) JitsuHiraku Akira 57-12647 (JP, U) (58 ) investigated the field (Int.Cl. ⁷ DB name) H01H 73/36

Claims (11)

(57) [Claims] 1. A fixed iron core formed in a substantially U shape by two side pieces and a connecting piece connecting these side pieces, and a space formed by the two side pieces and the connecting piece of the fixed iron core. A through electric current path, a movable iron core which is arranged so as to sandwich the electric current path between a fixed iron core and has one end side as a rotation center point and the other end side as a free end, and the movable iron core A fixed member that returns the free end side from the moving center point in a direction away from the fixed core, and the free end of the movable iron core is centered around the rotation center point when an excessive current flows in the current path. In the electromagnetic tripping device of the circuit breaker that is attracted to the side to release the latch and forcibly open the contact, the return member is attached to the movable iron core on one side, and the rotation center point of the movable iron core is fixed. The movable in a state of being in contact with the two side pieces of the fixed iron core. Formed of a leaf spring to hold the heart, attached to the other side of the leaf spring on either side piece of the fixed core
In addition, one side of the leaf spring is connected to both sides of the fixed iron core.
An electromagnetic trip device for a circuit breaker, characterized in that the electromagnetic trip device is attached to an inner surface of a movable core between side pieces . 2. A magnetic tripping of the circuit breaker according to claim 1, wherein the one side of the leaf spring and attached to the free end side of the movable iron core device. Wherein electromagnetic tripping of the circuit breaker according to claim 1, wherein the one side of the leaf spring and attached to the pivot center side of the movable iron core device. 4. It was attached to a position corresponding to the free end side or pivot center side of the armature in the fixed iron core away from one side to attach the other side of the plate spring to the movable iron core An electromagnetic trip device for a circuit breaker according to claim 2 or 3 . 5. A fixed iron core formed in a substantially U shape by two side pieces and a connecting piece connecting these side pieces, and a space formed by the two side pieces and the connecting piece of the fixed iron core. A through electric current path, a movable iron core which is arranged so as to sandwich the electric current path between a fixed iron core and has one end side as a rotation center point and the other end side as a free end, and the movable iron core A fixed member that returns the free end side from the moving center point in a direction away from the fixed core, and the free end of the movable iron core is centered around the rotation center point when an excessive current flows in the current path. In the electromagnetic tripping device of the circuit breaker that is attracted to the side to release the latch and forcibly open the contact, the return member is attached to the movable iron core on one side, and the rotation center point of the movable iron core is fixed. The movable in a state of being in contact with the two side pieces of the fixed iron core. It is composed of a leaf spring that holds the iron core, and the other side of this leaf spring is attached to both sides of the fixed iron core.
In addition, one side of the leaf spring straddles the movable iron core.
An electromagnetic trip device for a circuit breaker, characterized in that the electromagnetic trip device is attached to the outside of the movable core . 6. A magnetic tripping of the circuit breaker according to claim 5, wherein the one side of the leaf spring and attached to the pivot center side of the movable iron core device. Wherein said leaf spring, the circuit of claim 6, wherein the folded back so as to protrude outward from the outer surface of the movable iron core from both sides piece of the fixed core are attached to the movable iron core Electromagnetic trip device for circuit breaker. 8. Preparative the free end side of one said side at substantially the center of each side pieces of the fixed iron core by extending the free end side from the pivot center side of the movable core movable core of said leaf spring The electromagnetic trip device for a circuit breaker according to claim 5 , wherein the device is worn. 9. The other side of the leaf spring is attached to both side pieces of the corresponding fixed core along the free end side of the movable core,
The leaf spring is projected from the other side to the outer surface on the free end side of the movable core, and the substantially middle portion between the one side and the other side of the leaf spring is extended to the rotation center point side of the movable core. An electromagnetic trip device for a circuit breaker according to claim 5 or claim 8 . 10. A second side of the plate spring, the two legs facing the outer or inner surface of each side piece of the fixed core is provided, on both sides of the fixed iron core to form a locking portion into the two leg electromagnetic trip device of a circuit breaker of claim 1 to claim 9, wherein the forming the the engaged portion to be engaged with the engaging portion on the outer surface or the inner surface of the piece. 11. The two side pieces are formed so as to be gradually inclined toward the connecting piece from the end surface of the movable iron core on the side of the rotation center point to the end surface of the movable iron core on the free end side. An electromagnetic trip device for a circuit breaker according to any one of claims 1 to 10 .