JPH0728668Y2 - Switching mechanism for small circuit breakers - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention relates to an opening / closing mechanism of a small circuit breaker,
Between two parallel wall surfaces of the wall surface that surrounds the opening / closing mechanism using a toggle link in a U shape, the coaxially arranged right screw coil spring and left screw coil spring are connected by a U-shaped crossover wire. An opening / closing spring made of a single wire, an elongated hole having a width narrower than the inner diameter of the coil portion of the opening / closing spring, and a spring hook portion abutting on one side of the center of the U-shaped crossover wire of the opening / closing spring are formed. And a plate-shaped movable base that engages with the toggle link and has a movable contact fixed thereto, with the spring hook portion of the movable base in contact with the connecting line of the opening / closing spring. Of the opening and closing mechanism part for facilitating manual assembly of the opening and closing mechanism part of the small circuit breaker inserted through the inside of the coil of the opening and closing spring and the long hole of the plate-like movable base by the opening and closing shaft vertically passing through Regarding improvement.

[Conventional technology]

FIG. 3 and FIG. 4 show the structure of the opening / closing mechanism of a conventional small circuit breaker of this type. The yoke 1 made of a ferromagnetic material plate that constitutes the trip magnet 11 forms a U-shaped wall surface by the side walls 1a and 1b extending in parallel to the rear surface and the rear surface 1c, and between the side walls 1a and 1b. An opening / closing mechanism, which will be described in detail below, is provided. This opening / closing mechanism includes a handle 5 that is rotatable around a handle shaft 3 that vertically penetrates both side walls 1a and 1b.
A latch 6 rotatably coupled to the handle 5 via a pin 56; and an L-shaped bent portion 7a that abuts on a protrusion 6a of the latch 6 and is formed on the latch 6 via a pin 67. A link 7 that is relatively rotatable with respect to one direction only,
An opening / closing shaft 4 vertically penetrating both side walls 1a, 1b is vertically inserted into the surface, and is rotatably coupled via a link 7 and a pin 9a, and receives a clockwise force by an opening / closing spring 10. A plate-shaped movable base 9 to which the movable contact 8 is fixed is configured as a main constituent member.

The breaking operation of the small circuit breaker having the opening / closing mechanism configured as described above is performed as follows. That is, when an overcurrent flows in the circuit in which the circuit breaker is placed and the armature 11a of the trip magnet 11 is attracted, or the manual handle 100 is operated counterclockwise to rotate the handle 5 clockwise, The latch 6 pushes the L-shaped bent portion 7a of the link 7 by the protrusion 6a and starts to rotate around the pin 9a together with the link 7. When the angle formed by the line connecting the pin 67 and the pin 9a and the line connecting the pin 9a and the open / close shaft 4 exceeds 90 °, the latch 6 and the link 7 are bent in the shape of a leaf, and the movable table 9 is bent. Is rotated clockwise around the open / close shaft 4, and the movable contact 8 is separated from the fixed contact to perform interruption. At the time of closing, the manual handle 100 is operated in the clockwise direction to return to the position shown.

[Problems to be solved by the device]

The problems with the opening / closing mechanism configured as described above are as follows. That is, the above-mentioned opening / closing mechanism section is difficult to assemble automatically because there are many directions for assembling each member, and it is common to assemble manually. However, in this case, it is very difficult to insert the movable base 9 connected to the link 7 and the opening / closing spring 10 between the side walls 1a and 1b to insert the opening / closing shaft 4 for the following reason.

(1) It is difficult to keep the hollow hole 10e inside the coil portion of the opening / closing spring 10 and the elongated hole 9b of the movable table 9 in the same state inside the enclosure of the yoke 1 because the enclosure is narrow.

(2) Since the hollow hole 10e inside the coil portion of the opening / closing spring 10 and the elongated hole 9b of the movable table 9 are covered by both side walls 1a and 1b, they cannot be visually inspected, and it is determined whether or not they match each other. I have to rely on my intuition.

The object of the present invention is to improve the workability of assembling the opening / closing mechanism by requiring the operator to hold several parts in the past and relying on the skill of the operator. An object of the present invention is to provide a structure of an opening / closing mechanism section that can be easily assembled without relying on it.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, according to the present invention, a right-hand screw coil spring and a left-hand screw coil coaxially arranged between two parallel wall faces in a wall face surrounding an opening / closing mechanism using a toggle link in a U shape. An opening / closing spring made of one wire material connected to the spring by a U-shaped crossover wire, an elongated hole having a width narrower than the inner diameter of the coil portion of the opening / closing spring, and the center of the U-shaped crossover wire of the opening / closing spring. A plate-shaped movable base that engages with the toggle link, in which a spring hooking portion that is in contact with one side is formed and a movable contact is fixed, and the spring hooking portion of the movable base is the opening / closing spring. The structure of the opening / closing mechanism of the small circuit breaker which is inserted through the inside of the coil of the opening / closing spring and the long hole of the plate-like movable base by the opening / closing shaft which vertically penetrates the parallel two wall surfaces in the state of being in contact with , Across the side of the plate-shaped movable base opposite the spring force acting direction And a vertical distance between the surface of the spring hook portion on the side of the long hole and the center line of the long hole, and the axis line of one side of the center of the crossover and the open / close spring coil portion. It is assumed that the structure is set to be almost equal to the vertical distance from the axis line of.

[Action]

In this way, the spring hooking portion of the plate-shaped movable table has a concave surface formed on the side opposite to the spring force acting direction by forming the projection for blocking the movement of the crossover wire around the opening / closing axis. Therefore, when inserting the movable base and the opening / closing spring into the enclosure of the yoke, use the fact that the opening / closing spring has the center of gravity of the coil, and hang the connecting wire of the opening / closing spring on this concave surface, and use the connecting wire as a fulcrum. Hold the movable table so that the hollow hole of the opening / closing spring coil part and the long hole of the movable table match by rotating the movable table within the plate surface, and insert this into the enclosure of the yoke. If so, the enclosure can be easily inserted even if the enclosure is narrow, and the opening / closing shaft can be easily inserted.

〔Example〕

1 and 2 show the structure of a plate-shaped movable table according to an embodiment of the present invention. 3 and 4 in these figures
The same members as those shown in the drawings are designated by the same reference numerals and the description thereof will be omitted.

A protrusion 19d is formed on the spring hooking portion 19c of the movable table 19 on the side facing the surface of the opening / closing spring with which the connecting wire 10b is abutted, and the spring hooking portion 19c is formed as a concave surface. Also, the spring hook 1
The vertical distance L between the long hole side surface 19e of 9c and the center line of the long hole 19b is springed so that it is almost equal to the vertical distance D between the axis of the central side of the crossover 10b and the axis of the opening / closing spring coil. Part 19c
A surface 19e on the long hole side is formed. In the figure, 1f
Are spring hooks at both ends of the open / close spring, which are formed by partially deforming the side walls 1a and 1b (FIG. 4) of the yoke 1.

When the movable table 19 and the opening / closing spring 10 are inserted between the side walls 1a and 1b (Fig. 4), one central side of the connecting line 10b of the opening / closing spring is fitted into the spring hooking portion 19c of the movable table 9, and the right side of the drawing is shown. One side of the center of the crossover is hooked to the spring hook so that it is vertically downward, and the movable base is rotated around the crossover position as a fulcrum within the plate surface, that is, the paper surface of the figure to form an elongated hole. The movable table is held so that it is aligned with the hollow hole of the opening / closing spring coil portion, and the movable table is inserted between the side walls 1a and 1b of the yoke. By inserting the opening / closing shaft 4 vertically into the both side walls 1a and 1b in this state, the movable table 19 and the opening / closing spring 10 are held between the both side walls as shown in FIG.

[Effect of device]

As described above, according to the present invention, the plate-like movable base is provided with the protrusion for preventing the opening / closing spring connecting wire from moving around the opening / closing axis on the side opposite to the spring force acting direction. Since the spring hook is formed in a deep concave shape, the long hole side is placed vertically downward and the crossover wire is hooked on the spring hook so that only the movable table is held and inserted between the side walls of the yoke with a narrow gap. And the vertical distance between the long hole side surface of the spring hooking portion and the long hole center line and the vertical distance between the axis of the central side of the crossover line of the open / close spring and the hollow hole axis of the coil portion are almost equal to each other. Since the long hole side surface of the spring hook is formed so as to be equal, the center of gravity of the opening / closing spring is located in the coil before the insertion between the side walls of the yoke. The long hole and the open / close spring coil section are rotated by rotating them within the plate plane around the line position. By aligning the hollow holes with each other and inserting the yoke between both side walls in this state, it is possible to easily insert the opening / closing shaft into the opening / closing spring and the movable base from the outside of both side walls, and to assemble by hand. The workability of is significantly improved.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing an embodiment of an opening / closing mechanism of a small circuit breaker according to the present invention, FIG. 2 is a bottom view of the opening / closing mechanism shown in FIG. 1, and FIG. 3 is a conventional small circuit. FIG. 4 is a side sectional view of a circuit breaker showing an example of a configuration of an opening / closing mechanism section of the circuit breaker, and FIG. 4 is a front sectional view of essential parts of the small circuit breaker shown in FIG. 1: Yoke, 1a, 1b: Side wall, 4: Opening / closing axis, 8: Moving contact, 9, 19:
Movable table, 9b, 19b: Long hole, 9c, 19c: Spring hooking part, 10: Opening / closing spring, 10a: Right screw coil spring, 10b: Crossover wire, 10c: Left screw coil spring, L: Moving part of spring hooking part Vertical distance between the surface of the long hole (19b) and the center line of the long hole (19b), D: Vertical distance between the central axis of the opening / closing spring crossover and the opening / closing spring coil section axis.

Claims (1)

[Scope of utility model registration request] 1. A U-shaped space is provided between a right-hand screw coil spring and a left-hand screw coil spring that are coaxially arranged between two parallel wall faces of a wall face that surrounds an opening / closing mechanism using a toggle link in a U-shape. An opening / closing spring consisting of one wire connected by a connecting wire, an elongated hole having a width narrower than the inner diameter of the coil portion of the opening / closing spring, and a spring hook abutting on one side of the center of the U-shaped connecting wire of the opening / closing spring. And a plate-shaped movable base engaging with the toggle link, in which the movable contact is fixedly provided, and the spring hook portion of the movable base is in contact with the connecting line of the opening / closing spring. In the opening / closing mechanism of the small circuit breaker which is inserted through the inside of the coil of the opening / closing spring and the long hole of the plate-like movable base by the opening / closing shaft vertically penetrating the parallel two wall surfaces, Move the crossover wire around the opening / closing axis on the side opposite to the spring force acting direction. With stopper protrusions are formed,
The vertical distance between the surface of the spring hook portion on the long hole side and the center line of the long hole is set to be substantially equal to the vertical distance between the axis of one side of the center of the crossover and the axis of the opening / closing spring coil. Switching mechanism for small circuit breakers.