JP3800033B2 - Circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention releases the locked portion of the opening and closing mechanism locked to the locking portion by bringing the movable iron core and the fixed core close to each other when an excessive current flows in the energizing circuit, and forcibly opens the contact It relates to a circuit breaker.
[0002]
[Prior art]
In general, a circuit breaker is locked in a state in which a force in the opening direction is stored by a spring or the like with a contact inserted in a current path between a power source and a load closed, and an overcurrent or a short-circuit current When such an abnormal current passes through the energizing circuit, the tripping device that detects the abnormal current is released and the contact is forcibly opened. As a tripping device, for example, as described in JP-A-6-162910, a bimetal inserted in a current-carrying electric circuit holds an adsorbing piece, and a movable movable piece of magnetic material is arranged facing the adsorbing piece. Some have adopted the above configuration. The latch movable piece is formed with a locking hole for locking the locked portion of the opening / closing mechanism and locked to one end of the bimetal. When an overcurrent flows through the current path and the bimetal is bent by self-heating, The latch movable piece also bends together with the bimetal to release the locked state of the locked portion. Further, when a short-circuit current flows through the energization circuit, the attracting piece attracts the latch movable piece by a magnetic force and releases the locked state of the locked portion. In this way, a configuration is employed in which bending due to self-heating of the bimetal is used for overcurrent and magnetic force is used for short-circuit current.
[0003]
[Problems to be solved by the invention]
In the above, since the latch movable piece itself is formed with a locking hole for locking the locked portion of the opening / closing mechanism, a separate member for locking the locked portion of the opening / closing mechanism is provided. Assembly is improved without the need. However, since the latching hole is formed in the latch movable piece, when performing the drilling operation from the front side that latches the latched portion, wetting occurs at the periphery of the latching hole, and from the back side. And burr | flash will generate | occur | produce in the latching hole periphery. For this reason, the locking amount of the locked portion, that is, the tripping characteristic is not uniform, and a rework for making the tripping characteristic uniform is necessary.
[0004]
The present invention has been made in view of the above-mentioned reasons, and the object of the present invention is to improve circuit assembly and reduce the need for reworking to make the tripping characteristics uniform. Is to provide a vessel.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, a circuit breaker according to claim 1 is configured such that a contact inserted in an energization circuit between a power source and a load and a force for opening the contact when the contact is closed. An opening / closing mechanism that has a locked portion that stores and locks the contact and forcibly opens the contact by the force when the locked state is released, and knocks out and knocks out the thickness direction received A movable iron core having a latching portion formed so as to protrude from the back surface side opposite to the direction of latching the latched portion between the metal molds and a fixed iron core facing the movable iron core An electromagnet device that is disposed in a manner that surrounds the portion, and that attracts the movable core to the fixed core and releases the locked portion from the locking portion when a large current flows through the energizing circuit when the contact is closed. In the circuit breaker arranged in the above, the movable receiving core is provided with a protruding portion where the upper surface side connected to the engaging portion of the movable iron core is struck on the back surface side, and the movable portion is hit by the protruding portion. The upper surface side of the locking portion in the iron core is recessed so as to be continuously provided from the locking portion.
[0006]
The circuit breaker according to claim 2 is the circuit breaker according to claim 1, wherein the locked portion is formed of a softer material than the locking portion, and has a width orthogonal to the locking direction with the locking portion. It is set as the structure which made the dimension smaller than the width dimension of a latching | locking part.
[0007]
The circuit breaker according to claim 3 is the invention according to claim 1 or claim 2, wherein a part of the energizing circuit is a bimetal extending in the vertical direction of the body and having both ends fixed and free, The free end of the bimetal, the movable iron core, and the fixed iron core are connected by a plate spring formed integrally.
[0008]
A circuit breaker according to a fourth aspect of the present invention is the circuit breaker according to the third aspect of the invention, wherein the leaf spring is located on the free end side of the bimetal in the vertical direction of the body relative to the opposing surface of the free end of the bimetal, the movable core and the fixed core. Fixed in a state in which it is urged in a direction in which the movable core and the fixed core are brought into contact with each other with a spring force weaker than that of the first connecting portion, which is connected to the first connecting portion, and is connected to the first connecting portion. A second connecting portion that connects the iron core and one end side of the movable iron core, the movable iron core and the fixed iron core are brought into contact with the vessel body at the bimetal free end side in the vertical direction of the vessel body, and the movable iron core And a fixed core positioning rib that contacts the movable core facing surface side of the fixed core in a state where the spring force of the second connecting portion is accumulated by separating the fixed core from the bimetal fixed end side in the vertical direction of the body, the movable core and the fixed Iron core above and below the body A configuration equipped with a movable iron core positioning rib in contact with the opposite side to the fixed core facing side of the movable iron core in a state of accumulated spring force of the first coupling portion by a predetermined distance apart in the bimetal fixed end in.
[0009]
According to a fifth aspect of the present invention, in the circuit breaker according to the fourth aspect, the movable core extends from the surface facing the fixed core in the bimetal fixed end direction in the vertical direction of the body, and contacts the movable core positioning rib. The extending piece is provided.
[0010]
The circuit breaker according to claim 6 is configured such that, in the invention of claim 5, the width dimension of the extending piece is smaller than the width dimension at the facing surface position of the movable core facing the fixed core.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
[0012]
The circuit breaker of this embodiment is arranged in parallel in the width direction of the container body 1 in the container body 1 configured by connecting the first side case 1A and the second side case 1B made of synthetic resin on both sides. The two fixed contacts 2A, 2B, the two movable contacts 4A, 4B to which the fixed contacts 2A, 2B are opposed to the fixed contacts 2A, 2B are fixed, and the two movable contacts 4A. , 4B, and an opening / closing mechanism 5 for driving the handle 6, and by opening / closing the handle 6, the movable contacts 3A, 3B are brought into and out of contact with the fixed contacts 2A, 2B (contact / release) via the opening / closing mechanism 5. The fixed contacts 2A and 2B and the movable contacts 4A and 4B are arranged vertically in the height direction of the container 1, and two of the movable contacts 4A and 4B are 2 in the height direction. One movable contact 4B interposed between the two fixed contacts 2A and 2B and the other movable contact The fixed contact 2A at which the movable contact 3A of the child 4A is separated from the fixed contact 2A at a height position where the movable contact 3A and 3B are separated from the fixed contact 2A and 2B when viewed from the width direction of the body 1 It is arranged. The first contact portion composed of the fixed contact 2A and the movable contact 3A is inserted into the voltage electrode of the main circuit, and the second contact portion composed of the fixed contact 2B and the movable contact 3B serves as the ground electrode (neutral electrode) of the main circuit. Inserting.
[0013]
An intermediate case 7 formed of a synthetic resin material is fixed in one end portion of the container 1 so as to be sandwiched between both side cases 1A and 1B, and a recess 8 inside the side wall (outer wall) of the second side case 1B. And a terminal block 10B constituting a grounding pole side electric circuit provided with a fixed contact 2B at one end in a section constituted by the vertical wall portion 35 of the intermediate case 7 and is accommodated in the first case 1A side of the intermediate case 7. A terminal block 10A constituting a voltage electrode side electric circuit having a fixed contact 2A provided at one end is accommodated in a section constituted by the provided recess 9 and the side wall (outer wall) of the first case 1A.
[0014]
In the terminal block 10A, an extension piece 11a is integrally extended above a terminal plate 11 bent in a U-shape and one end of a lower piece of the terminal plate 11, and the upper end of the extension piece 11a is perpendicular to the extension piece 11a. A fixed contact 12A that is bent and integrally extended outward with respect to the terminal plate 11, a fixed contact 2A that is caulked and fixed to the upper surface of one end of the fixed contact 12A, and a lower piece of the terminal plate 11 It is comprised with the substantially M-shaped lock spring 13A accommodated in the terminal board 11. FIG. The terminal block 10 </ b> A 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 that is formed to extend in parallel to the bottom of the container body 1. The extension piece 11a is arranged along the wall 25, the fixed contact 12A is led out of the recess 9 beyond the upper end of the vertical wall 25, and the second side case 1B is placed outside the recess 9 in the longitudinal direction. By disposing the tip portion of the stationary contact 12A on the lateral wall 15 integrally formed substantially parallel to the bottom portion of the two-side case 1B, it is disposed in the recess 9. The horizontal wall 15 is formed with a recess 15a for allowing 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 formed by integrally extending a T-shaped piece 11 b upward from the other end of the upper piece, and the tip of the side protruding portion at the upper end of the T-shaped piece 11 b is formed on the wall surface of the intermediate case 7. It mounts on the upper end surface of convex part 22 '. Further, a protrusion 23 is integrally formed on the side surface of the side piece of the terminal plate 11 to be inserted into the holding piece 13b of the locking spring 13A and prevent the locking spring 13A from rattling.
[0015]
The lock spring 13A and the terminal plate 11 constitute a quick connection terminal as a conductor connecting portion. When the intermediate case 7 is overlapped with the first side case 1A, the vertical wall at the other end of the recess 9 of the intermediate case 7 Insertion of an electric wire formed by a diagonally downward groove 160 having a semicircular cross section provided in the section and a diagonally downward groove 160 provided in the vertical wall of the other end of the first side case 1A in the same manner as the diagonally downward groove 160 A core wire of an electric wire (not shown) inserted from the outside through the hole 16A 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 holding piece 13b. The core wire is locked in the drawing direction of the electric wire by the tip of the lock piece 13a, and the core wire is pressed against the upper piece of the terminal plate 11 by the upper end surface of the pressing piece 13b, thereby electrically connecting the core wire and the machine. It is supposed to hold. The release lock 17 is used to release the electric wire lock, and the release handle 17 has a rotary shaft 18 provided on the lower side surface thereof rotatable in a shaft hole 20 provided on the convex flat portion 22 ′ on the inner side surface of the intermediate case 7. An operating portion that is pivotally supported by a recess 37 formed on a side surface of a shaft 38 that is pivotally supported by the first side case 1A and protrudes from the inner wall surface of the first side case 1A. By manually operating 17a and rotating, the driving projection 19 provided at the lower end pushes the tip of one side end of the locking piece 13a of the locking spring 13A to bend the locking piece 13a and lock the core wire The state can be canceled. In the figure, reference numeral 21 denotes a return spring that constantly urges the release handle 17 to rotate in the anti-manual operation direction.
[0016]
On the other hand, the terminal block 10B is basically composed of a terminal plate 11, a lock spring 13B, and a stationary contact 12B, like the terminal block 10A. However, unlike the terminal plate 11 of the terminal block 10A, the terminal block 10B The terminal plate 11 of the block 10B has an extension piece 11c extending downward from one end of the lower piece, and a fixed contact 12B is extended from the tip of the extension piece 11c so as to be parallel to the bottom of the body 1. Further, a back piece 11d extending at a right angle from one end of the side piece of the terminal plate 11 is formed.
[0017]
The lock spring 13B has the same structure as the lock spring 13A, is placed on the lower piece of the terminal plate 11, and a protrusion 23 protruding from the side piece of the terminal plate 11 is inserted into the holding piece 13b. It has become so.
[0018]
In this terminal block 10B, the lower piece of the terminal plate 11 is placed on the bottom inclined bottom surface of the concave portion 8 of the second side case 1B, the extension piece 11a is arranged along the rising wall 8a at one end of the concave portion 8, and the rising wall One end of the terminal plate 11 is fitted into a notch 27 formed between the lower end of 8a and one end side of the bottom surface of the recess 8 so that the extension piece 11c goes out of the recess 8 and the intermediate case 7 is connected to the second case. When superposed on the side case 1B side, the front end of the fixed contact 12B, that is, the lower surface provided with the fixed contact 2B is placed on the rib 26 at the bottom of the second side case 1B. An isolation wall 14 is erected from the bottom of the second side case 1B near the tip of the fixed contact 12B, and a recess between the isolation wall 14 and the rib 26 is formed at the tip of the fixed contact 12B. It becomes the relief of the lower end part which protruded to the lower surface side of the fixed contact 12B of the fixed contact 2B fixed by caulking.
[0019]
Further, the tip of the side protruding portion at the upper end of the T-shaped piece 11b that is extended from the other end portion of the upper piece of the terminal plate 11 is above the convex flat portion 22 formed on the wall surface of the second side case 1B. Placed on the end face.
[0020]
The lock spring 13B and the terminal plate 11 of the terminal block 10B constitute a quick connection terminal as a conductor connecting portion as in the case of the terminal block 10A, and when the intermediate case 7 is superimposed on the second case 1B, The oblique downward groove 160 provided in the opposite wall surface of the intermediate case 7 as well as the oblique downward groove 160 having a semicircular cross section provided in the vertical wall portion at the other end of the concave portion 8 of the side case 1B. When the electric wire is inserted from the electric wire insertion hole 16B formed by the above, the core wire is locked by the locking piece 13a of the locking spring 13B, and the core wire is pressed against the upper piece of the terminal plate 11 by the pressing piece 13b. They are electrically connected and mechanically locked.
[0021]
The release handle 17 ′ is used to release the electric wire lock, and the release handle 17 ′ has a rotating shaft 18 provided on the lower side surface of the release handle 17 ′ on the convex flat portion 22 of the second case 1 </ b> B. A shaft (not shown) that is pivotally supported by the provided shaft hole 20 and protrudes from the wall surface of the vertical wall portion 35 of the intermediate case 7 is pivotally pivoted in a recess 37 provided on the other lower side surface. The operation protrusion 17a which is supported and exposed to the outside of the container body 1 is manually operated and rotated so that 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 13B. By pressing the part, the locking piece 13a is bent, and the locking with respect to the core wire can be released. In the figure, reference numeral 21 denotes a return spring that constantly urges the release handle 17 'to rotate in the anti-manual operation direction.
[0022]
Now, the opening / closing mechanism 5 that opens and closes the movable contacts 4A and 4B includes a handle 6, a connecting member 43 that connects the handle 6 to the movable contact 4A on the voltage pole side, and a locked end that is the rear end of the movable contact 4A. It consists of a movable iron core 58, a drive member 40, etc., each having a protruding locking portion 60 for locking the portion 4a.
[0023]
The connecting member 43 includes a contact pressure spring 44 made of a torsion coil spring, bent at both ends at substantially right angles to form shafts 44a and 44b, and a guide plate 45 formed in a substantially trapezoidal shape with a metal plate. Each shaft 44a, 44b of the contact pressure spring 44 is made to penetrate through guide holes 45a, 45b penetrating both ends of the lower bottom. A guide hole 45a through which one shaft 44a (hereinafter referred to as “upper shaft”) passes is a round hole, and a guide hole 45b through which the other shaft 44b (hereinafter referred to as “lower shaft”) passes is a guide plate 45. A long hole is formed so that the axial direction of the long axis substantially coincides with the bottom of the bottom.
[0024]
The handle 6 includes an operation unit 6a, a rotation unit 6b, and a handle shaft 6c, and a shaft formed on the inner surface of the first case 1A with a handle shaft 6c protruding from the center of both side surfaces of the rotation unit 6b. A hole 49 and a shaft hole 49 formed on the inner side surface of the second side case 1B are rotatably inserted and pivotally supported between the side cases 1A and 1B. The operation portion 6a is connected to the side cases 1A and 1B. It faces the window hole 50 opened on the upper surface of the container 1 configured in a state where the two are connected. Further, a handle biasing spring 51 made of a torsion coil spring is mounted on the handle shaft 6c, and the handle biasing spring 51 applies the handle 6 in the opening (off) direction in the closing (on) position (see FIG. 10). It is energized.
[0025]
An upper shaft 44a of the contact pressure spring 44 that passes through the guide hole 45a of the guide plate 45 is rotatably inserted into a shaft hole (not shown) provided at the lower end of the rotating shaft 6b, and the handle 6 is connected to the connecting member. 43 is connected.
[0026]
The connecting member 43 is configured such that the lower shaft 44b of the contact pressure spring 44 penetrating the guide hole 45b of the guide plate 45 is rotatably inserted into the bearing holes 30 provided on both sides of the center in the longitudinal direction of the movable contact 4A. It is connected to the movable contact 4 </ b> A and is disposed in the container body 1 so as to be movable up and down.
[0027]
The drive member 40 is formed in a substantially rectangular flat plate shape with an insulating synthetic resin, and is slidable in the vertical direction between the side cases 1A and 1B with the longitudinal direction aligned with the vertical direction (height direction) of the body 1. The upper side of the first side case 1A is provided with a cut groove 40a for fitting the side of the movable contact 4A from the side, and the lower side of the second side case 1B. Are each provided with a cut groove 40b for fitting the movable contact 4B from the lateral direction. Further, a substantially cylindrical fixing portion 40c projects from the end of the lower surface of the drive member 40 on the first case 1A side, and the upper end portion of the opening spring 53 made of a compression coil spring is fitted on the fixing portion 40c. Fixed. Further, as shown in FIG. 7, the standing wall 31 and the isolation wall 14 are arranged from the inner side surface of the second side case 1 </ b> B between the standing wall 31 and the isolation wall 14 erected substantially parallel to the isolation wall 14 from the bottom of the second side case 1 </ b> B. The lower end of the opening spring 53 is inserted and fixed in a recess 111 (referred to as “fixed recess”) surrounded by the standing wall 31, the isolation wall 14, and the rib 111a. Therefore, the drive member 40 is disposed in the container 1 in a state where the opening spring 53 is compressed, and is biased upward by the spring force of the opening spring 53 as shown in FIG. . At this time, since both ends of the opening spring 53 are fixed to the fixing portion 40c provided in the driving member 40 and the fixing recess 111 provided in the second side case 1B, the buckling of the opening spring 53 is prevented. Thus, the drive member 40 can be reliably urged.
[0028]
Further, a step portion 56a of a substantially bowl-shaped rib 56 projecting from the inner side surface of the first side case 1A and a recess 40d formed below the cut groove 40a on the side portion of the drive member 40 on the first side case 1A side. The upper step 33a of the vertical wall 33 and the drive member which are in contact with each other and extend vertically from the end surface opposite to the recess 8 of the lateral wall 15 protruding from the inner surface of the second case 1B. 40, the outer flange 40e formed between the recess 40d and the cut groove 40b are in contact with each other, and the upper end of the drive member 40 and the regulation rib 62 projecting from the inner surface of the second case 1B. The movement range of the drive member 40 is regulated by being in contact with and away from the part. Further, a guide recess 34 for guiding the outer flange portion 40e protruding in the width direction of the container body 1 is provided on the inner side surfaces of the side cases 1A and 1B in the movement range of the drive member 40. Here, the movable contact 4A is made of a rigid conductive metal plate that is softer than the movable iron core 58, has a movable contact 3A that is caulked and fixed to the front end side, and a rear end side of the engaging portion 60 of the movable iron core 58. It is inserted into the kerf 40a of the drive member 40 from the side. The movable contact 3 </ b> A is separated from and brought into contact with the corresponding fixed contact 2 </ b> A in a state where the locked portion 4 a is locked to the locking portion 60, and the container body is interlocked with the vertical movement of the connecting member 43. 1, the drive member 40 is slid up and down by pressing the opening edge of the kerf 40a. Here, since the movable contact 4A is formed of a rigid body, the movable contact 4A hardly bends even in the thickness direction along the moving direction. Further, the width dimension of the locked portion 4a of the movable contact 4A, that is, the depth direction of the paper surface in FIG. 1, is the width dimension of the locking portion 60 of the movable core 58, that is, the depth direction of the paper surface in FIG. It can be made narrower and it is easy to prevent the soft locked portion 4a from biting into the hard locking portion 60, and the locked portion 4a bites into the locking portion 60 to release the locked state. Thus, the influence on the tripping characteristic can be reduced.
[0029]
The movable contact 4B is made of a conductive spring thin plate material, and is inserted into the cut groove 40b of the drive member 40 from the side. When the drive member 40 moves downward, the movable contact 4B is pushed downward to bend and move from this bent state. When the latching state of the contact 4A is released and the upward movement of the drive member 40 is not restricted, the contact 4A returns and the movable contact 3B that is caulked and fixed to the tip is brought into contact with the fixed contact 2B by its bending and return. It is designed to be separated.
[0030]
As shown in FIGS. 3 and 4, the overcurrent tripping device 47 has an electromagnet device 48 that drives the movable iron core 58 when an overcurrent such as a short circuit current flows, and an overcurrent such as an overload current flows. And the bimetal 46 that drives the movable iron core 58 by bending displacement. The electromagnet device 48 includes a fixed iron core 57 formed by bending a magnetic iron plate into a substantially U shape in plan view, a movable iron core 58 that contacts and separates from the fixed iron core 57, and the movable iron core 58 is swung to both pole surfaces of the fixed iron core 57. The plate spring 59 is configured to be movably opposed and fixed and to fix the movable iron core 58 to the bimetal 46. The movable iron core 58 is made of a metal material (magnetic iron plate) that is harder than the metal material (copper alloy) that forms the movable contact 4A, and has a rectangular main portion 58a and one end protruding from the center of the lower edge of the main portion 58a. A mounting piece 58b on the side, an extending piece 58c that protrudes from the center of the upper edge of the main portion 58a and abuts against the movable core positioning rib 106 of the main body 1, and a surface facing the fixed iron core 57 of the main portion 58a A side face projecting from the center of the opposite surface has a substantially triangular locking portion 60, and a caulking pin (not shown) inserted through an attachment hole 58 d penetrating the attachment piece 58 b is attached to the leaf spring 59. By being inserted into a hole 59b formed in the central portion of the central piece 59a and caulked, it is supported by the leaf spring 59 in a swingable manner. As shown in FIG. 6, the locking portion 60 of the main portion 58 a is knocked out from the back surface side of the movable core 58 that is opposite to the direction in which the locked portion 4 a is locked (that is, the thickness direction of the movable core 58 is changed). It is formed between the metal molds for knock-out and tap-out receiving), so that wetting and burrs are less likely to occur, and the need for reworking to make the tripping characteristics uniform is reduced. Further, the surface side where the locking portion 60 is knocked out is tapped with the upper surface side continuous with the locking portion 60 on the back surface side (provided with a protruding portion on the above-described knock-out receiving mold and hitting with the protruding portion). A concave strip 60a is formed, so that the amount of locking of the locked portion 4a can be increased, and a mistrip in which the locked portion 4a is released from the locking portion 60 by impact or vibration is provided. It is easy to prevent. As shown in FIG. 1, the extension piece 58 c extends from the surface facing the fixed iron core 57, that is, the main portion 58 a upward from the body 1 (that is, the fixed end side of the bimetal 46), and faces the fixed iron core 57. The portion 58a is in contact with the movable core positioning rib 106 in a state where the upper direction of the body 1 is always separated from the fixed core 57 by a predetermined distance, and the locked portion 4a is locked by the displacement of the bimetal 46. At the time of release, the contact point between the extended piece 58c and the movable iron core positioning rib 106 can be used as the pivot point of the movable iron core 58, and the entire movable iron core 58 moves toward the fixed iron core 57 due to the displacement of the bimetal 46. The locked portion 4a can be reliably detached from the locking portion 60 with a slight displacement amount of the bimetal 46. For this reason, the arrangement | positioning space of the bimetal 46 can be made small, and the space in the container 1 can be utilized effectively. Further, it is possible to prevent the locked portion 4 a of the movable contact 4 </ b> A from being caught by the locking portion 60 and the movable iron core 58 from moving to the tip of the movable contact 4, that is, the contact side. Can be stabilized. Further, the extending piece 58c has a width dimension, that is, a depth direction of the paper surface in FIG. 1, as shown in FIGS. 3 to 5, and the width of the main portion 58a which is the facing surface position of the movable iron core 58 facing the fixed iron core 57. The size of the extension piece 58c is reduced by making it smaller than the dimension, that is, the depth direction in FIG. 1, and the locked portion 4a is prevented from being easily detached from the locking portion 60 by the weight of the movable iron core at the time of impact. Improves impact resistance. On the other hand, the leaf spring 59 is attached to a mounting hole 58d of a mounting piece 58b which is one end side of the movable iron core 58 which is the free end side of the bimetal 46 which is in the downward direction of the body 1 with respect to the opposed surfaces of the movable iron core 58 and the fixed iron core 57. The hole 59b formed in the central portion of the central piece 59a is caulked with a caulking pin (not shown), and the lower end of the hole 46a formed in the free end of the bimetal 46 which is the downward direction of the body 1 is penetrated. The holes 59e provided are caulked with caulking pins 67, and the two caulking pins 67 are used as a first connecting portion, and further, both side pieces 59c formed by bending on both sides of the upper end of the central piece 59a of the leaf spring 59, The locking pieces 59d and 59d, in which 59c is arranged along the outer surfaces of the both side pieces 57a and 57a of the fixed iron core 57 and projecting inwardly at the tips of the both side pieces 59c and 59c, are the outer corners of the fixed iron core 57. Formed in Parts 57 b, engagement was locked to 57 b, and between the mounting holes 58d of the mounting piece 58b of the locking position and the movable core 58 and the second connecting portion. At this time, as shown in FIG. 3, the central piece 59a portion in the second connecting portion is formed to be narrower than the first connecting portion so that the spring force of the second connecting portion is weaker than the spring force of the first connecting portion. In this state, the fixed iron core 57 is urged toward the movable iron core 58 by the central piece 59a in the second connecting portion of the leaf spring 59. Then, the movable iron core 58 and the fixed iron core 57 are brought into contact with the free end of the bimetal 46 which is the lower direction of the container 1, and the movable iron core 58 and the fixed iron core 57 are brought into contact with the bimetal 46 which is the upper direction of the container 1. The fixed core positioning ribs of the body 1 on the opposite surface side of the fixed core 57 in a state where the spring force of the second connecting portion (that is, the force biased toward the movable core 58) is accumulated at the fixed end side. By abutting 112, the free end side of the bimetal 46, which is the downward direction of the body 1 of the fixed iron core 57 and the movable iron core 58, can be brought into contact with a strong spring force, and the electromagnetic attractive force can be increased. It can be done. At this time, it is considered that the fixed end side of the bimetal 46 of the movable iron core 58 is brought into contact with the fixed iron core 57 by the spring force of the second connecting portion, but as described above, the spring force of the second connecting portion is the force of the first connecting portion. Since it is weaker than the spring force, it does not come into contact. Further, as described above, the movable core 58 on the fixed end side of the bimetal 46 which is the upward direction of the container body 1 because the extended piece 58 c of the movable core 58 is in contact with the movable core positioning rib 106 of the container body 1. Thus, the distance between the opposed surfaces of the 58 and the fixed iron core 57 can be made constant at all times, no manufacturing error occurs, and the tripping characteristics of the electromagnet device 48 can be stabilized.
[0031]
In the bimetal 46, the other end of the braided wire 79, one end of which is welded to the movable contact 4A, is welded to a plate surface slightly below the center, and a conductive plate 70 constituting an electric circuit on the voltage electrode side is formed on the upper plate surface. Be joined. The conductive plate 70 made of a metal plate includes an inverted L-shaped main piece 70a, an L-shaped extended piece 70b extending from the upper end of the main piece 70a, and a main piece 70a from the tip of the extended piece 70b. It has a joining piece 70c that extends and an L-shaped fastening piece 70d that extends from the lower end of the main piece 70a. The tip of the joining piece 70c is joined to the bimetal 46, and the lower end of the fastening piece 70d. A blade receiving spring portion 78 sandwiching a voltage bar conductive bar (not shown) disposed in the distribution board is welded and fixed, and the blade receiving spring portion 78, the conductive plate 70, the bimetal 46, the braided wire 79, The movable contact 4A is electrically connected. Thus, when an excessive current such as a short-circuit current flows through the terminal block 10 </ b> A or the conductive plate 70 to the bimetal 46 inserted into the voltage pole circuit, the fixed iron core 57 is excited, and both sides of the fixed iron core 57 are excited. The movable iron core 58 is attracted and swung by the magnetic force generated on the magnetic pole surface at the tip of the pieces 57a and 57a, and the locking portion 60 that locks the locked portion 4a of the movable contact 4A is moved. Thus, by providing the movable iron core 58 with the locking portion 60 and also serving as the locking member, the number of parts is reduced, and the assembling property is improved.
[0032]
On the other hand, in the movable contact 4B on the ground electrode side, a conductive plate 71 constituting an electric circuit on the ground electrode side is welded to the rear end portion. As shown in FIG. 2, the conductive plate 71 made of a metal plate includes a main piece 71a to which the movable contact 4B is welded at one end, a standing piece 71b rising from the other end of the main piece 71a, and a tip of the standing piece 71b. And an L-shaped extending piece 71c extending from the same, and a conductive bar (grounding electrode) disposed in the distribution board at the tip of the extending piece 71c in the same manner as the blade receiving spring part 78 described above. A blade receiving spring portion 81 sandwiching a not shown) is fixed by welding, and the blade receiving spring portion 81, the conductive plate 71, and the movable contact 4B are electrically connected.
[0033]
Thus, when assembling the circuit breaker of the present embodiment, first, the terminal block 10B is accommodated in the recess 8 of the second side case 1B, and the release handle 17 ′ is assembled in a fixed position together with the return spring 21 ′. Further, the handle 6 is assembled at a predetermined position together with the handle urging spring 51, and the blade receiving spring portion 81 is stored in the upper blade receiving spring storing portion 93 provided above the one end, and the standing piece 71 b of the conductive plate 71 is mounted. It arrange | positions so that the clearance gap between the partition walls 91 and 92 of 2nd side case 1B may be followed. Further, the obliquely upward inclined portion of the central portion of the movable contact 4B is parallel to the bottom from the lower end of the partition wall 92 located slightly above the bottom of the second side case 1B toward the other end of the second side case 1B. Furthermore, it is arranged between the partition wall 95 extended obliquely upward from the parallel part and the bottom part of the second side case 1B, and the free end side of the movable contact 4B is fixed across the standing wall 31 and the isolation wall 14. It arrange | positions in the space where the contact 12B is arrange | positioned. At this time, the main piece 71a of the conductive plate 71 and the rear end portion of the movable contact 4B are fixed by sandwiching the main piece 71a of the conductive plate 71 and the movable contact 4B with a plurality of ribs 96 respectively protruding from the lower surface of the parallel portion of the partition wall 95 and the bottom portion of the second case 1B.
[0034]
The movable contact 4B is sandwiched in the groove 40b of the drive member 40, and both ends of the opening spring 53 are fixed to the fixed portion 40c on the lower surface of the drive member 40 and the fixed recess 111 provided on the bottom of the second case 1B. It arrange | positions in the compression state between the drive member 40 and the 2nd case 1B bottom, and arrange | positions the drive member 40 to the predetermined position of the 2nd case 1B so that sliding movement is possible in the up-down direction. Further, the blade receiving spring portion 78 is accommodated in the blade receiving spring portion accommodating portion 90 located below the upper blade receiving spring portion accommodating portion 93 of the second side case 1B, and is above the partition wall 92 on the inner side surface of the second side case 1B. The upper end portion of the main piece 70a of the conductive plate 70 is fitted into the locking groove 99 provided in the upper portion of the conductive plate 70, and the conductive plate 70 extends into the fitting recess 94 provided on the inner side surface of the second case 1B above the locking groove 99. The conductive plate 70 is housed and fixed in the second side case 1B by fitting the protruding piece 70b, and the conductive plate 70 is fixed to the fixed piece 70d in the space from the center of the partition wall 92 along the longitudinal direction of the second side case 1B. The overcurrent tripping device 47 to which the bimetal 46 is fixed is accommodated. The movable core 58 is moved by contacting the tip of the extended piece 58c of the movable core 58 with the movable core positioning rib 106 protruding from the inner side surface of the second case 1B so as to face the fixed piece 70c of the conductive plate 71. Is regulated.
[0035]
Further, a portion between the center portion where the bearing hole 30 of the movable contact 4A connected to the bimetal 46 by the braided wire 79 and the tip end portion to which the movable contact 3A is fixed is fitted into the cut groove 40a of the drive member 40. The upper shaft 44a of the contact pressure spring 44 inserted through the guide hole 45a of the guide plate 45 is inserted into the shaft hole of the handle 6, and the lower shaft 44b of the contact pressure spring 44 inserted through the guide hole 45b of the guide plate 45 is movable. The connecting member 43 is connected to the handle 6 and the movable contact 4A through the bearing hole 30 of the contact 4A. At this time, the tip of the lower shaft 44b penetrating the bearing hole 30 of the movable contact 4A is fitted into a guide groove 103 provided along the vertical direction below the shaft hole 49 on the inner surface of the second side case 1B. The lower shaft 44b is guided by the guide groove 103 as the connecting member 43 moves up and down. Further, a positioning projection 105 is formed in the width direction of the second side case 1B in the vicinity of the lower end of the guide groove 103 of the partition wall 95 provided in the second side case 1B, and the handle 6 is operated to the closing position. With the connecting member 43 moving downward and closing the contact portion, the protruding piece 45c provided in the vicinity of the guide hole 45b on the lower side of the guide plate 45 is brought into contact with the positioning protrusion 105 to position the connecting member 43 ( (See FIG. 10).
[0036]
After assembling the intermediate case 7 and the terminal block 10A accommodated in the recess 9 of the intermediate case 7, the release handle 17, and the return spring 21 other than the second case 1B by fitting in the lateral direction, The intermediate case 7 in which the terminal block 10A, the release handle 17 and the return spring 21 are assembled in the recess 9 is disposed so as to overlap the second side case 1B side.
[0037]
Here, when the intermediate case 7 is disposed at a fixed position on the first case 1A side, the tip side portion of the fixed contact 12A provided on the terminal block 10A is placed on the recess 15a of the lateral wall 15. In addition, a shaft (not shown) fits into the recess 37 of the release handle 17 ′.
[0038]
In this state, the first case 1A is overlapped and connected to the second case 1B. At this time, the claw-like hooking portions 101 at the tips of the two elastic locking pieces 100 provided in the height direction up and down and both end directions integrally projecting from the second side case 1B to the first side case 1A side are the first. The first case 1A and the second case 1B are connected and fixed to each other to constitute the container body 1 by being engaged with the protruding hooked portions 102 provided corresponding to the side case 1A side. When disconnecting and fixing the first side case 1A and the second side case 1B, a screwdriver is provided from each release hole (not shown) opened in the first side case 1A corresponding to each hooked portion 102. The hooking portion 101 of each elastic locking piece 100 corresponding to the insertion is pressed (suppressed) upward to release the hooking portion 102 from the hooked portion 102, whereby the second side case 1B to the first side case 1A. Can be removed.
[0039]
Here, a rectangular plate-like rib 110 projecting toward the second side case 1B is formed on the inner side surface above the bottom of the first side case 1A substantially in the longitudinal direction, and the first side case 1A When the container 1 is assembled by connecting the second side case 1B, the braided wire 79 is sandwiched between the tip surface of the rib 110 and the inner side surface of the second side case 1B as shown in FIG. The braided wire 79 can be positioned on one side in the width direction of the bimetal 46 substantially perpendicular to the displacement direction of the bimetal 46 (longitudinal direction of the container 1). For this reason, the braided wire 79 does not get in the way when the bimetal 46, which will be described later, is displaced, and the influence of the braided wire 79 on the displacement characteristics of the bimetal 46 becomes difficult.
[0040]
Now, blade receiving springs 78 and 81 for sandwiching a conductive bar in the vertical direction are provided inside one end in the longitudinal direction of the container 1 constituted by connecting the first and second side cases 1A and 1B as described above. Conductive bar insertion grooves 107 and 108 opened in a U-shape on the end surface and both side surfaces of the container body 1 at one end portion of the container body 1 so as to correspond to the blade receiving spring portions 78 and 81. Will be formed.
[0041]
In addition, a pair of wire insertion holes 16A and 16B opened obliquely upward are formed in parallel at the other longitudinal end of the vessel body 1. Thus, by inserting load-side electric wires into the electric wire insertion holes 16A and 16B and connecting them to the terminal blocks 10A and 10B, and connecting the conductive bars to the blade receiving spring portions 78 and 81, the electric path of this embodiment can be used. A circuit breaker can be inserted.
[0042]
Here, as shown in FIG. 5, the first contact portion composed of the fixed contact 2A and the movable contact 3A and the second contact portion composed of the fixed contact 2B and the movable contact 3B are arranged in parallel in the height direction of the body 1. The container 1 can be downsized in the width direction. In addition, the first contact portion is disposed at substantially the center in the width direction of the container body 1 and the second contact portion is disposed at one end portion in the width direction of the container body 1 (the second side case 1B side end portion). By disposing the opening spring 53 at the other end (the first side case 1A side end) in the width direction of 1, the load applied to the first and second contact portions can be stabilized. As shown in FIG. 1, the first contact portion and the second contact portion are separated by the horizontal wall 15 provided in the second side case 1 </ b> B and the vertical wall 33 and the drive member 40 arranged in parallel with the vertical wall 33. A sufficient insulation distance can be ensured between both contact portions.
[0043]
Next, the operation of the present embodiment will be described with reference to FIG. 1 and FIGS.
[0044]
FIG. 1 shows an open (off) state. In this open state, the operation portion 6a of the handle 6 is in an inverted state exposed from the window hole 50, and the rear end portion of the movable contact 4A and the latch portion of the latch member 58 are shown. 60 is in a latched state. The drive member 40 is biased upward (upward in the height direction, hereinafter the same) in the figure of the container 1 by the opening spring 53 and is inserted into the kerf 40a of the drive member 40. 4A is in a state where the free end is moved upward, and the movable contact 4B inserted through the kerf 40b is in a state where the free end is moved upward by its spring elastic force. The provided movable contacts 3A, 3B are in a state (opened state) separated from the corresponding fixed contacts 2A, 2B.
[0045]
When the operation portion 6a of the handle 6 is rotated counterclockwise in the figure in this state, the upper shaft 44a of the contact pressure spring 44 is pushed downward as shown in FIG. 9, and the connecting member 43 is moved to the contact pressure spring. The movable contact 4A is rotated clockwise with the rear end latched by the latch portion 60 by the lower shaft 44b 44 as a fulcrum, and the movable contact 3A at the free end approaches the fixed contact 2A. In addition, the movable contact 4A is driven to move downward by the rotation of the movable contact 4A, and the drive member 40 is moved downward. This movement allows the movable member 4A to be inserted into the cut groove 40b of the drive member 40. The contact 4B bends in a direction to move the free end downward, and the movable contact 3B at the free end is brought into contact with the fixed contact 3B. Here, the distance traveled until the movable contact 3B contacts the fixed contact 2B (distance between the contacts of the second contact portion in the open state), the distance traveled until the movable contact 3A contacts the fixed contact 2A (first Therefore, the movable contact 3B having a short moving distance until contact comes into contact with the fixed contact 2B first to close the second contact portion (see FIG. 9).
[0046]
When the operation portion 6a of the handle 6 is further rotated counterclockwise, the movable contact 4A is rotated clockwise while further bending the flexible movable contact 4B, and the movable contact 3A is fixed. 2A is contacted and the 1st contact part is closed. If the operation portion 6a of the handle 6 is further rotated counterclockwise from there, the contact pressure from the line connecting the position of the lower shaft 44b of the contact pressure spring 44 and the rotation center of the handle 6 as shown in FIG. The upper shaft 44a of the spring 44 moves rightward in the figure, and in this state, a handle biasing spring 51 that biases the handle 6 clockwise, an opening spring 53 that biases the drive member 40 upward, and a movable contactor The contact pressure spring 44 that biases 4A downward, and the spring force of the movable contact 4B and the like are balanced, and the locked state between the rear end portion of the movable contact 4A and the locking portion 60 of the movable iron core 58 is maintained. The input state (ON state) of FIG. 10 is maintained.
[0047]
In this input state, the downward force is applied to the movable contact 4A by the spring force (returning force) of the contact pressure spring 44, and the contact pressure between the movable contact 3A and the fixed contact 2A is obtained by this force. A downward force is also applied to the movable contact 4B via the drive member 40 driven downward, and the contact pressure between the movable contact 3B and the fixed contact 2B is obtained by this force. That is, in this embodiment, contact pressure (contact pressure) can be applied to the first and second contact portions at the time of closing by the contact pressure spring 44 made of a torsion coil spring, and a separate spring for applying contact pressure is required. The number of parts can be reduced and the assembling work into the container 1 can be simplified. Further, in the inserted state, the protruding piece 45 c provided on the guide plate 45 abuts on the positioning projection 105 of the container 1 and the lower shaft 44 b of the contact pressure spring 44 is guided in the guide groove 103 provided on the container 1. The movable contacts 3A and 3B are regulated by restricting the movement of the lower shaft 44b of the contact pressure spring 44.
And the fixed contacts 2A and 2B can be easily brought into contact with each other accurately.
[0048]
Now, when the operating portion 6a of the handle 6 is rotated clockwise in the inserted state, the position of the upper shaft 44a of the contact pressure spring 44 is the center of rotation of the handle 6 and the position of the lower shaft 44b of the contact pressure spring 44. When the crossing line is crossed to the left, the balance of the spring force or the like is lost, the connecting member 43 moves upward by the biasing force of the contact pressure spring 44, and the handle 6 is biased by the biasing force of the handle biasing spring 51. Quickly returns to the open (off) side. By moving the drive member 40 upward, the movable contact 4A rotates counterclockwise around the locked portion 4a locked by the locking portion 60 and moves the free end upward to move the movable contact 3A. The first contact portion is opened by separating from the fixed contact 2A (see FIG. 9). Further, since the movable contact 4A is rotated counterclockwise, the driving member 40 is driven and moved upward, so that the movable contact 4B is not pushed downward, and is restored to its original state by its spring force. As a result, the movable contact 3B at the free end is separated from the fixed contact 2B to open the second contact portion. Here, as described above, the distance between the contacts of the second contact portion is made shorter than the distance between the contacts of the first contact portion, and the movable contact 4B is formed of a flexible spring material. The movable contact 3A is released from the fixed contact 2A before the deflected movable contact 4B returns to the original state and the movable contact 3B is separated from the fixed contact 2B (see FIG. 9), and then the original state. The movable contact 4B that has returned to the position moves the movable contact 3B upward to separate the movable contact 3B from the fixed contact 2B.
[0049]
By the way, even when the movable contact 3A comes into contact with the fixed contact 2A before the movable contact 3B comes into contact with the fixed contact 2B at the time of insertion, the movable contact 4A is made of a rigid body and therefore tries to rotate the handle 6. Since the movable contact 4A does not bend and the drive member 40 cannot move downward any more, the movement of the movable contact 4B is restricted, the movable contact 3B and the fixed contact 2B come into contact with each other, and the second contact portion is closed. Can be prevented. Therefore, at the time of switching from the open state to the closed state, the second contact portion (the fixed contact 2B and the movable contact 3B) on the ground electrode side is more than the first contact portion (the fixed contact 2A and the movable contact 3A) on the voltage electrode side. The contact is always closed first, and when switching from the closed state to the open state, the second contact portion on the ground electrode side is always opened after the first contact portion on the voltage electrode side. As a result, it is possible to prevent a large current from flowing through the second contact part on the grounding pole side or an arc when opening and closing, and an inexpensive non-durable contact material is used for the second contact part on the grounding pole side. it can.
[0050]
Further, since only the connecting member 43 is interposed between the handle 6 and the movable contact 4A, and the movable contact 4A is directly locked to the movable iron core 58, the number of parts is reduced and the structure is reduced as compared with the conventional case. It is possible to simplify the assembly work for assembling the parts into the container body 1. Here, the movable iron core 58 is formed of iron which is a member harder than a copper alloy which is a member forming the movable contact 4A, and the movable iron core 58 has a width dimension of the locked portion 4a of the movable contact 4A. Since the width dimension of the locking part 60 is increased, the locked part 4a of the movable contact 4A is prevented from entering the locking part 60 of the movable iron core 58, and the load applied to the locking part 60 is stabilized. Therefore, the influence on the trip characteristic can be reduced.
[0051]
Furthermore, the movable contact 4A on the voltage electrode side and the movable contact 4B on the ground electrode side are movable in the same direction (the height direction of the container 1), and the drive member 40 is moved along the moving direction of the movable contacts 4A and 4B. Therefore, the drive member 40 can have a simple structure and can be easily incorporated into the container body 1.
[0052]
Now, when the overcurrent flows through the load in the above-mentioned input state shown in FIG. 10, the bimetal 46 generates heat due to the overcurrent and is curved and displaced. Here, as shown in FIG. 11, the bimetal 46 hanging down from above is displaced so that the lower end moves in the left direction in the figure, and the second movable iron core 58 connected to the lower end of the bimetal 46 via the leaf spring 59 is provided. The stopper piece 58c that contacts the contact piece 106 provided on the inner surface of the side case 1B is rotated clockwise with the stopper piece 58c as a fulcrum. As a result, the locking portion 60 provided on the movable iron core 58 moves to the left, the locked state of the locked portion 4a of the movable contact 4A is released, and the driving member 40 is directed upward by the biasing force of the opening spring 53. Therefore, the movable contact 4A rotates counterclockwise about the lower shaft 44b of the contact pressure spring 44, and the movable contact 4B is not pushed down by the drive member 40 and returns to the original state. As shown in FIG. 12, the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B to forcibly open the first and second contact portions. At this time, the movable contact 3A is fixed before the movable contact 3B which is bent in the closed state returns to its original state and the movable contact 3B is separated from the fixed contact 2B in the same manner as in the above opening operation. Since it is separated from 2A, the first contact portion of the voltage electrode is opened before the second contact portion of the ground electrode even during the trip operation due to the overload current.
[0053]
Thereafter, the bimetal 46 returns to the original state by the electric circuit interruption. Further, since the balance of the spring force and the like is lost by releasing the locked state of the locked portion 4a of the movable contact 4A, the handle 6 is rapidly moved to the open (off) side by the biasing force of the handle biasing spring 51. And the connecting member 43 moves upward.
[0054]
Further, in the above-mentioned input state shown in FIG. 10, when an excessive current such as a short circuit current flows, a magnetic force is generated in the fixed core 57 of the electromagnet device 48 constituting the overcurrent tripping device 47, and the corresponding movable core 58 is Suction and rock. As a result, as in the above-described tripping operation due to overcurrent, the locking portion 60 provided on the movable iron core 58 moves to the left as shown in FIG. 13 and the locked portion 4a of the movable contact 4A is locked. Is released and the driving member 40 is moved upward by the biasing force of the opening spring 53, so that the movable contact 4A rotates counterclockwise around the lower shaft 44b of the contact pressure spring 44 and is movable. The child 4B returns to its original state without being pushed down by the driving member 40, and the movable contacts 3A, 3B are separated from the fixed contacts 2A, 2B, respectively, and the first and second contact portions are forcibly opened. At this time, the movable contact 3A is bent before the movable contact 3B is released from the fixed contact 2B after the movable contact 4B bent in the closed state is returned to the original state as in the case of the trip operation due to overcurrent. Since it is separated from the fixed contact 2A, the first contact portion of the voltage electrode is opened before the second contact portion of the ground electrode even during the trip operation due to the short-circuit current.
[0055]
Thereafter, when no magnetic force is generated in the fixed iron core 57 of the electromagnet device 48 due to the electric circuit interruption, the movable iron core 58 returns to the original state by the spring force of the leaf spring 59. Further, since the balance of the spring force and the like is lost by releasing the locked state of the locked portion 4a of the movable contact 4A, the handle 6 is rapidly moved to the open (off) side by the biasing force of the handle biasing spring 51. And the connecting member 43 moves upward.
[0056]
By the way, in the present embodiment, the driving member 40 is biased upward by the opening spring 53, that is, the movable contact 3A is urged away from the fixed contact 2A. When the second contact portion is forcibly opened, the movable contactor 4A is released from the locked state by the movable iron core 58, so that the connection point between the connecting member 43 and the movable contactor 4A (contact pressure spring 44) is released. 4A, the movable contact 4A rotates counterclockwise about the lower shaft 44b) as a fulcrum, and the distance between the contacts in the tripped state than the distance between the movable contact 3A and the fixed contact 2A in the open state (see FIG. 1). Becomes larger (see FIG. 12). As a result, the arc generated at the first contact portion at the time of forced opening can be quickly cut to shorten the opening time. Further, the movable contact 4B formed of a leaf spring is pressed downward and bent when the drive member 40 moves downward, and the latched state of the movable contact 4A is released from this bent state, and the drive member 40 When the upward movement is no longer restricted, it returns, so that when the contact portion is forcibly opened as described above, an upward driving force is applied from the movable contact 4B to the driving member 40, and the first contact portion due to the arc. It becomes easy to prevent welding. Furthermore, since the biasing force of the opening spring 53 acts as a driving force on the driving member 40, it becomes easier to prevent the first contact portion from being welded by the arc.
[0057]
【The invention's effect】
The circuit breaker according to claim 1 is configured to store a contact point inserted in an energization circuit between a power source and a load and a locked state by storing a force for opening the contact point when the contact point is closed. Opening and closing mechanism that has a locking part and forcibly opens the contact by the force when the locked state is released, and knocks out and knocks out the thickness direction received A movable iron core having a latching portion formed so as to protrude from the back surface side opposite to the direction of latching the latched portion between the metal molds and a fixed iron core facing the movable iron core An electromagnet device that is disposed in a manner that surrounds the portion, and that attracts the movable core to the fixed core and releases the locked portion from the locking portion when a large current flows through the energizing circuit when the contact is closed. Therefore, the number of parts can be reduced by combining the locking portion for locking the locked portion of the opening / closing mechanism with the movable iron core of the electromagnet device, thereby improving the assemblability. Moreover, because the locking portion is formed by knocking out from the back side of the movable iron core, wetting and burrs are less likely to occur, and there is less need for reworking to make the tripping characteristics uniform. There is an effect. In particular, the die for knocking out and receiving is provided with a projecting portion that taps the upper surface side connected to the engaging portion of the movable iron core to the back surface side, and the upper surface of the engaging portion in the movable iron core is struck by the projecting portion. Since the side is recessed so as to be continuously provided from the locking portion, the amount of locking of the locked portion can be increased, and a mistrip that can be released from the locking portion by impact or vibration is provided. It becomes easy to prevent.
[0058]
The circuit breaker according to claim 2 is the circuit breaker according to claim 1, wherein the locked portion is formed of a softer material than the locking portion, and has a width orthogonal to the locking direction with the locking portion. Since the size is made smaller than the width of the locking portion, it is easy to prevent the soft locked portion from biting into the hard locking portion, and the influence on the tripping characteristics can be reduced. .
[0059]
The circuit breaker according to claim 3 is the invention according to claim 1 or claim 2, wherein a part of the energizing circuit is a bimetal extending in the vertical direction of the body and having both ends fixed and free, Since the free end of the bimetal, the movable iron core, and the fixed iron core are connected by a plate spring formed integrally, the electromagnet device can be blocked, and the work of assembling the electromagnet device into the body is facilitated.
[0060]
A circuit breaker according to a fourth aspect of the present invention is the circuit breaker according to the third aspect of the invention, wherein the leaf spring is located on the free end side of the bimetal in the vertical direction of the body relative to the opposing surface of the free end of the bimetal, the movable core and the fixed core. Fixed in a state in which it is urged in a direction in which the movable core and the fixed core are brought into contact with each other with a spring force weaker than that of the first connecting portion, which is connected to the first connecting portion, and is connected to the first connecting portion. A second connecting portion that connects the iron core and one end side of the movable iron core, the movable iron core and the fixed iron core are brought into contact with the vessel body at the bimetal free end side in the vertical direction of the vessel body, and the movable iron core And a fixed core positioning rib that contacts the movable core facing surface side of the fixed core in a state where the spring force of the second connecting portion is accumulated by separating the fixed core from the bimetal fixed end side in the vertical direction of the body, the movable core and the fixed Iron core above and below the body A movable core positioning rib that abuts against the side opposite to the fixed core facing surface side of the movable core in a state where the spring force of the first connecting portion is accumulated at a predetermined interval on the bimetal fixed end side in the In the up and down direction, the distance between the movable iron core and the fixed iron core on the fixed side of the bimetal can always be constant, and the tripping characteristics by the electromagnet device can be stabilized. Moreover, the bimetal free end side can be contacted with a strong spring force in the vertical direction of the body with the movable iron core and the fixed iron core, and the electromagnetic attractive force can be increased.
[0061]
According to a fifth aspect of the present invention, in the circuit breaker according to the fourth aspect, the movable iron core extends from the surface facing the fixed iron core in the bimetal fixed end direction in the vertical direction of the body and abuts on the movable iron core positioning rib. Since the extended piece is provided, the contact point between the extended piece and the movable core positioning rib can be used as the pivot point of the movable iron core when the locked state of the locked portion is released due to the bimetal displacement. Due to the displacement, the entire movable iron core moves to the fixed iron core side, and the locked portion can be reliably pulled off from the locking portion with a small amount of displacement of the bimetal. For this reason, a bimetal arrangement | positioning space can be made small and the space in a container can be utilized effectively.
[0062]
In the circuit breaker according to claim 6, in the invention of claim 5, the width dimension of the extension piece is made smaller than the width dimension at the facing surface position of the movable core facing the fixed iron core. The weight can be reduced and the impact resistance can be improved.
[Brief description of the drawings]
FIG. 1 is a side view showing an opened state of the embodiment, with a first side case removed.
FIG. 2 is an exploded perspective view of the above.
FIG. 3 is an exploded perspective view of the overcurrent tripping device according to the above.
FIG. 4 is a perspective view of the overcurrent trip device in the same as above.
FIG. 5 is a front view of the movable iron core according to the above.
FIG. 6 is a side sectional view of the movable iron core according to the above.
FIG. 7 is a front sectional view of the above.
FIG. 8 is a central sectional view of the above.
FIG. 9 is a side view showing a state during the closing or opening operation, with the first side case removed.
FIG. 10 is a side view showing the input state, with the first side case removed.
FIG. 11 is a side view showing the moment when the bimetal is displaced, with the first case removed.
FIG. 12 is a side view showing a state where the bimetal is displaced and the contact portion is forcibly opened, and the first case is removed.
FIG. 13 is a side view showing the moment when the electromagnet device is operated, with the first case removed.
[Explanation of symbols]
1 body
2A, 2B fixed contact
3A, 3B movable contact
4A, 4B Movable contact
4a Locked part
5 Opening and closing mechanism
46 Bimetal
48 Electromagnet Device
57 Fixed iron core
58 Movable iron core
60 Locking part

Claims (6)

There is a contact point inserted in the energization circuit between the power source and the load, and a locked portion that stores the force in the direction of opening the contact point when the contact point is closed and is locked. Opening and closing mechanism that forcibly opens the contact by the force when released, and knocking out from the back side that is opposite to the direction of locking the locked portion by punching the thickness direction and punching out the receiving mold A movable iron core having a formed locking portion and a fixed iron core facing the movable iron core are disposed so as to surround a part of the energizing circuit, and when a large current flows through the energizing circuit when the contact is closed, the movable iron core is In the circuit breaker disposed in the body, an electromagnet device that attracts the fixed iron core and releases the locked portion from the locking portion,
In the knock-out receiving mold, a protruding portion is provided in which the upper surface side connected to the engaging portion of the movable iron core is knocked to the back surface side, and the upper surface side of the engaging portion in the movable iron core is formed by hitting with the protruding portion. A circuit breaker characterized in that it is recessed in such a way as to be continuously provided from the locking portion.   The locked portion is formed of a softer material than the locking portion, and the width dimension orthogonal to the locking direction with the locking portion is made smaller than the width size of the locking portion. The circuit breaker according to claim 1.   A part of the energizing circuit is a bimetal that extends in the vertical direction of the body and has both ends as a fixed end and a free end, and the free end of the bimetal, a movable iron core, and a fixed iron core are connected by a plate spring integrally formed. The circuit breaker according to claim 1 or 2, wherein   The leaf spring includes a first connecting portion that connects the free end of the bimetal and one end of the movable iron core that is the free end of the bimetal in the vertical direction of the body relative to the opposing surfaces of the movable iron core and the fixed iron core. A second connecting portion that is connected to the connecting portion and connects the fixed iron core and one end side of the movable iron core in a state in which the movable iron core and the fixed iron core are biased in a direction in which the movable iron core and the fixed iron core are brought into contact with each other with a spring force weaker than that of the first connecting portion. The movable iron core and the fixed iron core are abutted on the bimetal free end side in the vertical direction of the vessel body, and the movable iron core and the fixed iron core are separated on the bimetal fixed end side in the vertical direction of the vessel body. The fixed core positioning rib that contacts the movable core facing surface side of the fixed core with the spring force of the second connecting portion accumulated, and the movable core and the fixed core are separated by a predetermined distance on the bimetal fixed end side in the vertical direction of the body First Circuit breaker according to claim 3, characterized in that and a movable iron core positioning rib in contact with the opposite side to the fixed core facing side of the movable iron core in a state of accumulated spring force of the sintered part.   5. The extending piece that extends in a bimetal fixed end direction in the vertical direction of the body from the surface facing the fixed iron core and contacts the movable iron core positioning rib is provided on the movable iron core. Circuit breaker.   6. The circuit breaker according to claim 5, wherein a width dimension of the extension piece is made smaller than a width dimension at the position of the facing surface of the movable core facing the fixed core.

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