JP3786220B2 - Circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small circuit breaker in which a contact, an opening / closing mechanism, an overcurrent tripping device, and the like are housed in an insulating container divided into a right part and a right part.
[0002]
[Prior art]
In this type of circuit breaker, as described in Japanese Patent Application Laid-Open No. 7-57607, an open / close mechanism is conventionally assembled inside a support frame having side plates on the left and right sides, and the support frame is incorporated in an insulating container. I am doing so.
[0003]
[Problems to be solved by the invention]
Since the conventional circuit breaker uses a support frame for assembling the switching mechanism, the cost is increased accordingly. However, conventionally, the side plate of the support frame is brought close to the side surface of the movable contact to guide its opening and closing movement. Therefore, if the support frame is omitted, the movable contact swings in the lateral direction, and particularly the trip operation becomes unstable. There was a fear.
The present invention has been made under such a background, and it is intended to reduce the cost by omitting the support frame of the opening / closing mechanism, while preventing the lateral movement of the movable contact and ensuring the operation reliability.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention includes a movable contact, an opening / closing mechanism for opening and closing the movable contact by reversing the action of an opening / closing spring, in an insulating container divided into a right part and a right part. In a circuit breaker in which a current trip device or the like is housed, an opening / closing mechanism is directly assembled in the container, and one side surface of the movable contact is brought close to the inner surface of the case, and at one end of the case and the cover A protrusion adjacent to the other side surface of the movable contact is integrally formed on the sandwiched cover plate or auxiliary switch terminal block, and the opening and closing movement of the movable contact is guided between the protrusion and the inner surface of the case. Then , it is assumed that lateral movement of the movable contact that opens and closes can be suppressed. That is, according to the present invention, the supporting switch terminal block is omitted and the opening / closing mechanism is directly assembled to the insulating container, while the auxiliary switch terminal block is sandwiched between the case and the cover, and the terminal block. In the case where no is necessary, a protrusion is integrally formed on the cover plate that is similarly mounted, and the protrusion prevents the movable contact from shaking .
[0005]
In the above circuit breaker, a protrusion is integrally formed at the contact portion of the cover plate or auxiliary switch terminal block with the case or cover, and the protrusion is crushed by the case or cover so that the cover plate or auxiliary switch terminal block is It is good to fix. This eliminates rattling of the cover plate or auxiliary switch terminal block, and guides the movable contact by the protrusion.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. First, FIG. 1 is a side view of a circuit breaker showing the inside of the case 1 with the cover of the insulating container divided into left and right divided into a case 1 and a cover (not shown), and FIG. 2 is an exploded perspective view of the main part thereof. It is. 1 is in the OFF state, and the movable contact 4 having one end connected to the handle lever 2 via the projecting shaft 3 is connected to the arm 5a of the latch 5 by an open / close spring 6 to which the timepiece of FIG. The other end portion having the movable contact 7 is in contact with the stopper portion at one end of the load side terminal 8, and is separated from the fixed contact 9. When the handle lever 2 is rotated clockwise around the support shaft 11 via the operation handle 10 mounted on the head of the handle lever 2 from this OFF state, the opening / closing spring 6 acts on the movable contact 4. Inverted, the movable contact 4 rotates counterclockwise, and the movable contact 7 contacts the fixed contact 9.
[0007]
In this ON state, current flows from the power supply side terminal 12 to the load side terminal 8 through the trip coil 14 of the overcurrent tripping device 13, the fixed contact 15, the fixed contact 9, the movable contact 7, and the lead wire 16. Further, when the overcurrent tripping device 13 detects an overcurrent state in the ON state and the armature 19 supported by the yoke 18 is sucked against the return spring 20 via the pin 17, the armature 19 is integrally extended. The latch receiver 21 is rotated around the support shaft 21a by the portion 19a. As a result, it is difficult to understand in FIG. 1, but the latch 5 is unlocked by the claw of the latch receiver 21 and is rotated counterclockwise in FIG. 1 with the pin 22 supported by the yoke 18 as a fulcrum. To do. As a result, the action of the open / close spring 6 on the movable contact 4 is reversed, and the movable contact 4 rotates clockwise until it contacts the stopper 23, and the movable contact 7 is separated from the fixed contact 9 (trip operation).
[0008]
In FIG. 2, a stepped spindle 11 is integrally formed with the case 1, and the handle lever 2 is directly fitted into the large diameter portion thereof through a hole 2a. Note that a substantially symmetric cover is abutted against the case 1, and a projecting shaft integrally formed on the cover corresponding to the support shaft 11 is fitted into a small diameter portion of the support shaft 11 to press the handle lever 2 from the side surface. . The movable contact 4 is connected to the handle lever 2 by a projecting shaft 3 provided facing the inner sides of the left and right arms, one end of the opening / closing spring 6 is hooked in the hole 4a of the movable contact 4, and the other end is a latch 5. In the notch 5c at the tip of the arm 5a. On the other hand, the pin 22 that supports the latch 5 is inserted into the bearing hole 18 a of the yoke 18 and the bearing hole 5 d of the latch 5, and the support shaft 21 a integrated with the latch receiver 21 is fitted into the notch 18 b of the yoke 18. The latching portion 5b of the latch 5 is latched by the claw 21b of the latch receiver 21. When the responding portion 21c of the latch receiver 21 is pushed by the operating portion 19a by the suction of the armature 19, the claw 21a is rotated by the rotation of the latch receiver 21. Deviate from.
[0009]
Further, in FIG. 2, the overcurrent tripping device 13 (FIG. 1) including the yoke 18 is fitted in a recess surrounded by the wall plates 25 and 26 integral with the case 1, and the fixed contact 9 is joined to the fixed contact 9. The child 15 is fitted into the back surface of the wall plate 25. Further, the stopper 23 is fitted between the inverted L-shaped wall plate 27 and the protrusion 28 that are integral with the case 1.
[0010]
FIG. 3 schematically shows the case 1 and the cover 24 of the circuit breaker described above. Although a wall is provided around the case 1 and the cover 24, the load side (the left front side in FIG. 3) does not have a peripheral wall, and that portion is a cover plate 29 or an auxiliary switch terminal block (hereinafter simply referred to as a terminal block). (FIG. 4). FIG. 5 shows an enlarged view of the lid plate 29 and a part of the case 1 from the opposite side of FIG. In FIG. 5, the cover plate 29 has a side wall 29 a that contacts the case 1 and a side wall 29 b that contacts the cover 24, and a projection 29 c that contacts the lower surface of the wall plate 27 of the case 1 is formed on the step portion of the side wall 29 a. Further, the side wall 29b is formed with a step portion 29d that fits with a protrusion (not shown) on the inner periphery of the cover 24. Furthermore, two large and small plate-like protrusions 29e and 29f are formed on the inner side of the lid plate 29 so as to protrude horizontally.
[0011]
When the case 1 and the cover 24 are coupled, the lid plate 29 is sandwiched between them and attached as shown in FIG. At that time, the side wall 29a is aligned with the protrusion 31 of the case 1 and the notch 29g (FIG. 4) of the protrusion 29e is fitted to the protrusion 31. Further, as described above, the cover 24 has a protrusion (not shown) fitted into the stepped portion 29d of the side wall 29b, and the lower end portion formed in an inverted L shape is formed on the wall plates 31 and 32 behind the load side terminal 8. Put it on top. In that case, the cover plate 29 receives a compressive force in the vertical direction between the wall plate 27 and the wall plate 31 of the case 1, and the protrusion 29c is crushed and firmly fixed without a gap. Here, as shown in FIG. 5, the protrusion 29 f of the cover plate 29 is notched in an L shape on the case 1 side, and the side surface of this notch is on the cover 24 side of the movable contact 4 assembled to the case 1. Close to the side.
[0012]
FIG. 6 shows this state, and is a cross-sectional view of the principal part taken along line VI-VI in FIG. In FIG. 6, the left side surface of the movable contact 4 connected to the handle lever 2 is close to the inner surface of the case 1, and the right side surface is close to the side surface of the protrusion 29 f of the lid plate 29. The movable contact 4 is connected to the handle lever 2 only at the upper end portion by the projecting shaft 3, and when there is no projecting portion 29f, there is a possibility that the movable contact 4 may sway to the cover 24 side during the opening / closing movement. On the other hand, according to the illustrated configuration, the movable contact 4 is guided to open and close through an appropriate gap between the case 1 and the protrusion 29f of the cover plate 29, so that the opening and closing operation can be repeated. There will be no side effects.
[0013]
In the circuit breaker of FIG. 1, when an auxiliary switch for detecting the open / close state is provided, a terminal block 30 shown in FIG. 4 is attached instead of the cover plate 29. Although the shape of the terminal block 30 is schematically shown in FIG. 4, the structure for sandwiching between the case 1 and the cover 24 is substantially the same as that of the cover plate 29, and the auxiliary is linked to the opening / closing movement of the handle lever 2. The switch 34 is attached to the side surface of a protrusion 30 a that is vertically formed on the inner side of the terminal block 30, and a protrusion (not shown) formed on the opposite side surface is close to the side surface of the movable contact 4 on the cover 24 side. Then, guide the opening and closing movement.
[0014]
【The invention's effect】
As described above, according to the present invention , a movable contact, an opening / closing mechanism that opens and closes the movable contact by reversing the action of the opening / closing spring, and an overcurrent pull-in are provided in an insulating container that is divided into a case and a cover. In a circuit breaker in which a removal device or the like is housed, a lid is assembled by directly assembling an opening / closing mechanism in the container, with one side surface of the movable contact being brought close to the inner surface of the case, and being sandwiched between one end of the case and the cover A protrusion adjacent to the other side surface of the movable contact is integrally formed on the plate or the auxiliary switch terminal block, and the opening and closing movement of the movable contact is guided between the protrusion and the inner surface of the case. by, while reducing the number of parts is omitted support frame of the opening and closing mechanism, holding the horizontal deflection of the opening and closing movement of the movable contact, constituting the child the operation reliability of the superior circuit breaker inexpensive Can. Also, in that case, a protrusion is integrally formed at the contact portion of the cover plate or auxiliary switch terminal block with the case or cover, and the protrusion is crushed when sandwiched to firmly fix the cover plate or auxiliary switch without any gap. be able to.
[Brief description of the drawings]
FIG. 1 is a side view of an interior of a circuit breaker showing an embodiment of the present invention.
FIG. 2 is an exploded perspective view of a main part of the circuit breaker shown in FIG.
3 is a perspective view of a case, a cover, and a cover plate of the circuit breaker of FIG. 1. FIG.
FIG. 4 is a schematic perspective view of an auxiliary switch terminal block.
5 is an enlarged perspective view seen from the opposite side of the lid plate in FIG. 3. FIG.
6 is a cross-sectional view of a main part taken along line VI-VI in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 2 Handle lever 4 Movable contact 5 Latch 6 Opening / closing spring 10 Operation handle 13 Overcurrent tripping device 15 Fixed contact 16 Lead wire 24 Cover 29 Cover plate 29c Projection 29e Projection 30 Terminal block for auxiliary switch

Claims (2)

A circuit breaker that houses a movable contact, an open / close mechanism that opens and closes the movable contact by reversing the action of an open / close spring , an overcurrent trip device, etc. in an insulating container that is divided into a case and a cover. In
Assembling the closing mechanism directly in the container, wherein the movable contact at a side of the movable contactor causes close to the inner surface of the casing, the cover plate or terminal block auxiliary switch sandwiched one end of the case and the cover A protrusion adjacent to the other side surface of the child is integrally formed, the opening and closing movement of the movable contact is guided between the protrusion and the inner surface of the case, and the rolling of the movable contact that opens and closes is suppressed. A circuit breaker characterized by that. A protrusion is integrally formed at the contact portion of the cover plate or auxiliary switch terminal block with the case or cover, and the protrusion is crushed by the case or cover to fix the cover plate or auxiliary switch terminal block. The circuit breaker according to claim 1.

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