JPH0332032Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to an opening/closing mechanism for a relatively small circuit breaker.

[Prior art and its problems]

As this type of opening/closing mechanism, the one shown in FIGS. 5 and 6 is known. This conventional opening/closing mechanism supports an armature 3, which is attracted to the iron core 2 of the coil 1 when an overcurrent occurs, rotatably with respect to a fixed contact 4 fixed to a fixed contact stand 41, and kicks out the armature 3 integrally with the armature 3. An opening/closing spring 1 for a movable contact base 8 comprising an overcurrent detection device 6 formed by a part 5 and a movable contact 7 that turns on and off with respect to the fixed contact 4.
The movable contact table 8 is rotatably supported by a support pin 9 to which a control lever 10 is attached.
is directly connected via a first link 11 and a second link 12, and has a tripping mechanism 14 having a trip rod 13 on the second link 12, and when the operating lever 10 is set to the on position. When the armature 3 is in a state where the iron core 2 is
When the trip lever 13 is kicked out by the kick-out portion 5 when the trip rod 13 is shut off due to attraction, the tripping mechanism 14 is activated and the movable contact 7 is switched to a stable OFF state.

In the tripping mechanism 14 of the opening/closing mechanism, the first and second links 11 and 12 that connect the operating lever 10 and the movable contact block 8 are connected by pins 17, 18, and 19, respectively, and this tripping mechanism In the mechanism 14, the operation lever 10 is connected to the support pin 16.
The movable contact base 8 is connected to the yoke 2 by the support pin 9.
It is assembled by being supported by 0.

As is clear from FIG. 6, the opening/closing spring 15 has two separated coiled portions 15a and 15b with the movable contact base 8 in between.
a and 15b are connected at a central arm portion 15c.
The terminal portion 151 of the opening/closing spring 15 is connected to the overcurrent detection device 6
The lower part 20a of the yoke 20 is in contact with the lower part 20a of the yoke 20. The force of this opening/closing spring 15 acts on the movable contact base 8 in a direction to separate the movable contact 7 from the fixed contact 4 with the support pin 9 as the center of rotation.

In such a conventional device, in order to assemble the open/close spring 15 and the movable contact base 8, the support pin 9 must be passed through the yoke 20 after the open/close spring 15 and the movable contact base 8 are assembled. The front and back positions make assembly difficult, and during assembly, the terminal 151 of the opening/closing spring 15 is
Since the opening/closing spring 15 has a strong spring force and must be hooked onto the lower part 20a of the opening/closing spring 15, it has a drawback that assembly workability is poor.

[Purpose of invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit breaker that eliminates the drawbacks of conventional devices, has a simple structure, and is easy to assemble.

[Key points of the idea]

The key points of the present invention are: an overcurrent detection device having an armature that is attracted to an iron core around which a coil is wound when an overcurrent occurs; an opening/closing mechanism configured by connecting an operating lever and a movable contact block; A circuit breaker comprising a tripping mechanism that operates the opening/closing mechanism so that the movable contact is tripped from the fixed contact in accordance with the operation of the detection device, wherein the opening/closing mechanism is connected to an operating lever and a plate-shaped first link. A plate-shaped second link and a movable contact base are sequentially connected by pins, and the movable contact base is rotatably supported by a support pin supported by a case, and a single coil-shaped Equipped with an opening/closing spring consisting of a spring,
A bent end on one end side of the opening/closing spring is locked to the movable contact base and biased in a direction to push it up;
The bent end on the other end side of this opening/closing spring is stopped by a fixed member so that movement in the rotating direction of the movable contact block and in the direction of the rotating axis of the movable contact block is restricted, and the movable contact block is fixed to the support pin. The main feature is that it is pressed in the axial direction toward the case, which allows assembly by simply inserting each part from the open side of the case, and also facilitates the work of hooking the terminal of the opening/closing spring. .

[Example of idea]

An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4. In each figure, the same parts or parts having the same functions as those shown in FIGS. 5 and 6 are designated by the same reference numerals.

First, the configuration of a circuit breaker opening/closing mechanism will be explained with reference to FIG. 31 shows the case again, and the operating lever part 10a of the operating lever 10 protrudes outside from the insertion hole 31b of this case 31,
The shaft portion 10b of the operating lever 10 is inserted into the shaft support hole 31a drilled in the portion 1b, and the other shaft portion 10b of the operating lever 10 is connected to the shaft support hole 33a of the support body 33 and the cover 32 (FIG. 2). (see) is inserted into the shaft support hole 32a. The lever piece 10c of the operating lever 10 is connected to the first link 11 via the connecting pin 35, the first link 11 is connected to the second link 12 via the connecting pin 36, and the second link 12 is connected to the second link 12 via the connecting pin 36. It is connected to the movable contact base 8 via a connecting pin 37. A support pin 9 passes through the elongated hole 8a of the movable contact base 8. The support pin 9 has one end supported by the shaft support hole 31d formed in the protrusion 31c of the case 31, and the other end supported by the shaft support hole 3 of the support body 33.
3b. Further, an opening/closing spring 50 having a single coil winding portion 50a is attached to the support pin 9, and a bent end portion 50b on one end side of the opening/closing spring 50 is a movable contact base as shown in FIGS. 3 and 4. 8 and the tip of the bent end portion 50c on the other end side of the opening/closing spring 50 is in contact with the case 31.
It is hooked into a groove 31f of a protrusion 31e formed in the. The fixed legs 33c and 33d of the support body 33 are fitted into the holes 31g and 31h of the case 31 and are fixed, and the operation lever 10, the first link 11, and the second link 1 are connected between the support body 33 and the case 31.
2. A tripping mechanism consisting of a trip rod 13 and a movable contact block 8 is sandwiched between the tripping mechanism and the case 31.
I will support you along with you. 20 is a yoke, and the cut-and-raised piece 20b of this yoke 20 presses the end portion 50c of the opening/closing spring 50 in the axial direction of the support pin 9, as shown in FIG. Note that the overcurrent detection device itself is the same as the conventional device, so it is omitted.

Next, the assembly of this circuit breaker will be explained.
First, the operation lever 10 and the plate-shaped first link 11,
The second link 12 and the movable contact base 8 are connected and integrated by connecting pins 35, 36, and 37 to form a tripping mechanism. Next, the operating lever part 10a of the operating lever 10 of this integrated tripping mechanism is inserted in line with the insertion hole 31a of the case 31, and at the same time, the shaft part 10b of the operating lever 10 is fitted into the shaft support hole 31b of the case 31. It's crowded. Then, the support pin 9 is inserted into the shaft support hole 31d formed in the protrusion 31c of the case 31 through the elongated hole 8a of the movable contact base 8 of the tripping mechanism.
Insert it into the One end is the shaft support hole 31d of the case 31
An opening/closing spring 50 having a single coil winding part 50a is inserted into the support pin 9 from the other end of the support pin 9 inserted into the support pin 9, and its terminal part 50b is hooked onto the movable contact base 8 as shown in FIG. Next, the terminal bent portion 50
A groove 31f formed in the protrusion 31e of the case 31.
Push it into. After this, the fixed leg 33c of the support body 33,
33d to match the holes 31g, 31h of the case 31, and the shaft support holes 33a, 33 of the support body 33.
The shaft portion 10b of the operating lever 10 and the support pin 9 are aligned with the position b, and the support body 33 is pressed toward the case 31 to be fixed to the case 31. Then, the overcurrent detection device 6 is fixed to the case 31, and the bent end portion 50c of the opening/closing spring 50 is fixed by the cut and raised piece 20b of the yoke 20.
is pressed, and finally the cover 32 is put on.

In the circuit breaker configured in this manner, the bent end portion 50b at one end of the opening/closing spring 50 is locked to the movable contact base 8, and the bent end portion 50c at the other end is engaged with the locking groove 31f provided in the case. The rotation direction of the movable contact base 12 and the support pin 9 are engaged and restrained by the cut and raised pieces 20b of the yoke.
Since the movable contact block 8 is stopped from two directions in the axial direction, the movable contact block 8 is pressed by the opening/closing spring 50 and the case 32
The support protrusion 31d is positioned in contact with the support protrusion 31d. Case 3 of the terminal bent portion 50c of the opening/closing spring 50
Since the overcurrent detection device 6 is not fixed to the case when it is hooked to the groove 31f formed in the projection 31e of 1, it can be easily installed in a wide place.

Note that the opening/closing spring can also be positioned by providing a protrusion that abuts the end of the coiled portion of the opening/closing spring 50 at a position of the support body 33 facing the opening/closing spring 50.

[Effect of idea]

As explained above, according to the present invention, an opening/closing mechanism is constructed by connecting an overcurrent detection device having an armature that is attracted to an iron core around which a coil is wound when an overcurrent occurs, an operating lever, and a movable contact block. and a tripping mechanism that operates the opening/closing mechanism so that the movable contact is tripped from the fixed contact in response to the operation of the overcurrent detection device, wherein the opening/closing mechanism is connected to an operating lever and a plate-shaped A first link, a plate-shaped second link, and a movable contact base are sequentially connected by pins, and the movable contact base is rotatably supported by a support pin supported by a case. An opening/closing spring consisting of a single coiled spring is attached, and one bent end of this opening/closing spring is engaged with the movable contact block and biased in a direction to push it up, and the other end of this opening/closing spring is The bent end of the side is stopped by a fixing member so that movement in the rotating direction of the movable contact block and in the direction of the rotating axis of the movable contact block is restricted, and the movable contact block is attached to the case in the axial direction of the support pin. By pressing the circuit breaker in the opposite direction, the circuit breaker can be assembled by simply inserting each component from the open side of the case, thereby improving assembly work efficiency. In addition, since the end of the opening/closing spring is locked to the case, it is possible to lock the end of the opening/closing spring before fixing the overcurrent detection device to the case. ) has the advantage of being extremely easy.

[Brief explanation of drawings]

Figures 1 to 4 each show an embodiment of the present invention, with Figure 1 being an exploded perspective view of the main parts thereof, Figure 2 being a longitudinal sectional view, and Figure 3 being an explanatory diagram showing the hooking of the opening/closing spring. , FIG. 4 is a cross-sectional view taken from FIG. 3, and FIGS. 5 and 6 each show a conventional device. FIG. 5 is a front view of the opening/closing mechanism, and FIG. 6 is a longitudinal sectional view. 1: Coil, 2: Iron core, 3: Armature,
8: Movable contact stand, 9: Support pin, 10: Operation lever, 11: First link, 12: Second link,
31: Case, 50: Opening/closing spring.

Claims (1)

[Scope of utility model registration request] an overcurrent detection device having an armature that is attracted to an iron core around which a coil is wound when an overcurrent occurs;
An opening/closing mechanism configured by connecting an operating lever and a movable contact stand, and a tripping mechanism that operates the opening/closing mechanism so that the movable contact is tripped from the fixed contact in response to the operation of the overcurrent detection device. In the circuit breaker, the opening/closing mechanism is formed by sequentially connecting an operation lever, a plate-shaped first link, a plate-shaped second link, and a movable contact base with pins, and the movable contact base is supported by a case. An opening/closing spring made of a single coiled spring is attached to the supporting pin, and one bent end of the opening/closing spring is locked to the movable contact block. This is biased in the upward direction, and the bent end on the other end side of this opening/closing spring is restrained by a fixing member so that movement in the rotating direction of the movable contact block and in the direction of the rotating axis of the movable contact block is restricted. An opening/closing mechanism for a circuit breaker, characterized in that the movable contact block is pressed toward the case in the axial direction of the support pin.