JPS6046500B2 - Manufacturing method for circuit breakers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a circuit shield that detects overcurrent and interrupts a circuit.

Conventionally, in this type of circuit and Shinden, the movable contact plate is operated through an interlocking mechanism such as a link or lever by operating the handle, and the interlocking mechanism is connected to an abnormality detection device through a pull-out mechanism. are doing.

When the abnormality detection device is activated by an abnormal current, a tripping mechanism is activated, and the movable contact plate is returned to its original position via an interlocking mechanism, thereby interrupting the circuit. By the way, in such a mechanism, links, levers, etc. are connected at very close locations, which requires time and effort to assemble, resulting in increased costs.

The present invention aims to improve these points,
Easy link connection, easy and quick assembly,
It is designed to be made inexpensively.

Next, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a rectangular base made of insulating synthetic resin. A power supply terminal 2 is fixed to one end of the base 1, and a terminal screw 3 is attached to the power supply terminal 2. It's screwed in. A fixed contact plate 4 is integrally provided inside the power supply side terminal 2, and a fixed contact 5 is attached to the top surface of the tip of the fixed contact plate 4. In addition, the base 1
A load terminal 6 is fixed to the other end, and a terminal screw 7 is screwed into the load terminal 6.

A first frame 1 is integrally formed with a magnetic metal material on the base 1 between the power supply side terminal 2 and the load side terminal 6.
1 is fixed with a screw 11a, this first frame 11 is provided with a bearing part 12 on one side, bearing pieces 13 are provided upright on both sides of this bearing part 12, and the bearing pieces 13 on both sides are provided with a vertical direction. One end of a movable contact rotary base 16 integrally formed of insulating synthetic resin is rotatably supported by a support shaft 15 through an elongated hole 14, and a movable contact is mounted on the upper surface of this movable contact rotary base 16. The base of the plate 17 is fixed, and a movable contact 18 opposite to the fixed contact 5 is attached to the bottom surface of the tip of the movable contact plate 17, and a movable contact 18 facing the fixed contact 5 is attached between the upper surface of the bearing part 12 and the middle part of the movable contact rotating base 16. A coil spring 19 is interposed between the movable contact plate 17 together with the movable contact rotating base 16, and the movable contact plate 17 is always biased upward so that the movable contact 18 is separated from the fixed contact 5.
An opening/closing mechanism 20 is configured.

A substantially L-shaped magnetic guide part 21 is formed on the other side of the first frame 11, and an oil case 22 made of a non-magnetic material and housing a shaft is erected from the bottom of the magnetic guide part 21. A plunger 23 is inserted into the oil case 22 so as to be movable up and down, and a plunger 23 is inserted into the upper end of the oil case 22 from a magnetic material. A coil spring 25 is attached between the plunger 23 and the ball 24.
is interposed.

An electromagnetic coil 2 is attached to the outer periphery of the oil case 22.
6 is installed, and one of this electromagnetic coils 26! The lead wire 27 at the end is connected to the base of the movable contact plate 17 by soldering, spot welding, etc., and the electromagnetic coil 26
A lead wire 28 at the other end is connected to the load side terminal 6 by soldering, spot welding, or the like.

Further, bearing pieces 29 are formed on both upper sides of the magnetic guide section 21 of the first frame 11, and the bearing pieces 29 on both sides
The armature 3 is connected to the ball 24 with a support shaft 30 in between.
1 is pivotally supported, and a pushing part 32 is provided from the base of the armature 31 toward the top of the armature 31. The armature 31 is always urged upward by a spring 33, and an abnormality detection device detects overcurrent. 34 is formed.

Furthermore, an operating device 40 is provided on the base 1.

This operating device 40 has a second frame 41 fixed adjacent to the first frame 11 and having a substantially U-shape in plan view.
A handle 43 is rotatably supported on the upper part of the second frame 41 by a support shaft 42, and the handle 43 is always urged clockwise in FIG. 1 by a spring 44. The upper end of a first link 46 is rotatably connected to the lower end of the base of the handle 43 by a connecting shaft 45.
The upper end of a second link 48 is rotatably connected to the lower end of the first link 46 by a connecting shaft 47, and the lower end of this second link 48 is connected to the movable contact rotating base by a connecting shaft 49. 16
The support shaft 15 is rotatably connected to the support shaft 15 on the opposite side. The base of an engaging body 52, which is substantially U-shaped in plan view, is rotatably supported by a support shaft 51 at the lower part of the second frame 41. A convex arc-shaped guide surface 53 is formed that contacts the connecting shaft 47 between the first link 46 and the second link 48, and the engaging body 5
A concave arc-shaped guide surface 54 is formed on the lower edge of the guide plate 2 .

Furthermore, a drawer body 5 is integrally formed of synthetic resin with a support shaft 55 at a position above the engaging body 52 of the second frame 41.
6 is rotatably supported, and an engaging body 57 is formed at the base of this tripping body 56 to detachably engage with the middle upper part of the engaging body 52.
An arm 58 extends from both sides of the upper part of the arm 58, and a round rod-shaped actuating part 59 is provided between the tips of the arms 58 on both sides, and this actuating part 59 is inserted between the armature 31 and its pushing part 32. ing. Next, the assembly of the operating device 40 will be explained with reference to FIGS. 3 to 5.

A temporary fixing hole 62 is bored in the first link 46 adjacent to the shaft hole 61 of the connecting shaft 47 that connects with the second link 48, and the temporary fixing hole 62 is bored in the second frame 41. A temporary fixing hole 63 corresponding to the hole 63 is bored.

As shown in FIG. 3, after installing the opening/closing mechanism 26 and the operating device 40 into the base 1, as shown in FIG.
Align the temporary fixing hole 62 of the link 46 with the temporary fixing hole 63 of the second frame 41, insert the temporary fixing shaft 64,
The link 46 is temporarily fixed and positioned.

Next, as shown in FIG. 5, when the second link 48, which has been previously connected to the movable contact rotating table 16 by the connecting shaft 49, is rotated and positioned by contacting the temporary fixing shaft 64, the first
The shaft hole 61 of the link 46 and the shaft hole 65 of the second link 48
In this state, the connecting shaft 47 is inserted into the shaft holes 61 and 65, and the temporary fixing shaft 64 is pulled out.

The support shaft 42 of the handle 43, the connection shaft 45 between the handle 43 and the first link 46, the connection shaft 47 between the first link 46 and the second link 48, the second link 48 and the movable contact plate The connecting shaft 49 with the 17 movable contact rotating base 16 is
The movable contact 18 of the movable contact plate 17 is set at a position very close to a dead point that maintains the on state when it is in the on state in contact with the fixed contact 5, that is, at a substantially linear position. In this case, at the complete dead point, the connecting shaft 47 between the first link 46 and the second link 48
Since the link does not rotate, the connecting shaft 47 is supported in contact with the guide surface 53 of the distal end edge of the engaging body 42 at an angle sufficient to allow escape, and the first link 46 and the second link 48 are connected. Try to prevent it from rotating. Further, the support shaft 51 of the engaging body 52 is also set at a position close to the dead point with respect to the direction of the above-mentioned force. Next, the operation of the circuit and disconnector assembled in this manner will be explained.

First, when turning on, the handle 43 is rotated counterclockwise in FIG. 1.

This rotation of the handle 43 pushes down the first link 46 via the connection shaft 45, further moves the connection shaft 47 downward along the guide surface 53 of the engaging body 52, and pushes down the second link 48. , the movable contact plate 17 is pushed down against the elasticity of the spring 19, and the movable contact 18 contacts the fixed contact 5 of the fixed contact plate 4, turning on the circuit as shown in FIG. Then, the on state is maintained with the connecting shaft 47 exceeding the reversal point. In this state, if an overcurrent flows through the electromagnetic coil 26, the plunger 2 inside the oil case 22
Regarding the relationship between the upward electromagnetic force received by the plunger 3 and the spring 25, the plunger 23 does not move when the current is 100% of the rated value, but when the current is 125% of the rated value, the plunger 23 is pulled up toward the ball 24 with a delay characteristic due to the viscosity of the oil. , two-ball plunger 23, electromagnetic guide section 21 of first frame 11,
A magnetic circuit is formed in the armature 31, the magnetic flux interlinking with the armature 31 increases, and the armature 31 is attracted.

When this armature 31 is sucked and rotated downward,
The pushing portion 32 pushes the actuating portion 59 of the tripping body 56 downward, thereby causing the tripping body 56 to rotate clockwise in FIG. The movable contact plate 17 is pushed up together with the movable contact rotating table 16 by the restoring force of the spring 19, and the movable contact 18 is separated from the fixed contact 5 to turn off the circuit. In this state, when the handle 43 is rotated in the opposite direction, the second link 48 is pulled up and rotated via the first link 46, and the connecting shaft 47 moves along the guide surface 54 of the lower edge of the engaging body 52. It slides and moves to the guide surface 53 on the tip edge,
Return to off state. Also, in the on state of the circuit,
By rotating the handle 43 in the opposite direction, the first link 46 and the second link 48 are similarly rotated, and the movable contact plate 17 is released from being pressed down, turning it off! The state can be restored. In the above embodiment, the case of overcurrent has been described, but the present invention can also be applied to abnormal current such as leakage.

Further, in the case of three phases, only the opening/closing mechanism 2/0 is provided on the two poles at both ends, and by connecting them with the connecting shaft 49, the three poles can be turned on and off at the same time.

According to the present invention, when the abnormality detection device operates, the tripping body is activated to release the fixation of the engaging body, so that the first link, the second link, and 7 of the operating mechanism rotate, and the movable contact There is a mechanism that releases the on state of the plate and turns it off to break the circuit, but when connecting the first link on the handle side and the second link on the movable contact plate side, the first link using the temporary fixing hole in the frame and fixing it with the temporary fixing shaft, and then
The links can be aligned and connected using the connecting shaft,
Therefore, it can be assembled easily and quickly, and can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the circuit breaker of the present invention, and FIG. 2 is a side view with a part of the engaging body section cut away.
3 to 5 are partially cutaway side views of the assembled state. 4...Fixed contact plate, 5...Fixed contact,
17...Movable contact plate, 18...Movable contact, 34
...Abnormality detection device, 40...Operation device, 41...Freno, 42...Spin shaft, 4
3...Handle, 45...Connection shaft, 4
6... First link, 47... Connection shaft, 48... Second link, 49... Connection shaft, 52... Connection Union, 56...Removal body, 61...Shaft hole, 62...Temporary fixing hole, 63...Temporary fixing hole, 65... ...Shaft hole.

Claims (1)

[Claims] 1. A fixed contact plate having a fixed contact, a movable contact plate having a movable contact that approaches and separates from the fixed contact and is biased in a direction in which the movable contact moves away from the fixed contact, and this movable contact plate. An abnormality detection device provided in the circuit, and an operating device that operates the movable contact plate and is operated by the abnormality detection device, and the operating device includes a handle rotatably supported on a frame. A first link is rotatably connected at one end to the handle, and the other end of the first link is rotatably connected to the other end by a connecting shaft inserted into each shaft hole. and a second link whose other end is rotatably connected to the movable contact plate, and a base which is rotatably supported by the frame and is a connecting shaft between the first link and the second link. and a tripping body rotatably supported by the frame, detachably engaged with the engaging body, and actuated by the abnormality detection device, the first Temporary fixing holes corresponding to each other are bored in the link and the frame, and a locking shaft is inserted into these temporary fixing holes to temporarily fix the first link to the frame, and then the second link is rotated. The shaft hole corresponds to the shaft hole of the first link, and these first
A method for manufacturing a circuit board and a stage device, characterized in that a connecting shaft is inserted into the shaft hole of the link and the second link to connect them.