JPH0236206Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to improvements in circuit breakers, particularly in their long-time tripping devices.

[Conventional technology]

FIG. 4 shows the structure of a conventional circuit breaker with a long time tripping device, which is disclosed, for example, in Japanese Utility Model Application Publication No. 61-4338.

In this figure, 1 is a molded base forming the housing of the device, 2 and 3 are connection terminals to an external circuit, 4 is an operating handle, and 5 is a link whose one end is rotatably connected to the operating handle. ,6
is a drive mechanism which can be engaged with the other end of the link 5 and forms a well-known toggle mechanism together with the spring 20 to drive the movable element 7. 8 is a movable contact fixed to the movable element; 9
is a stator disposed opposite to the movable element, 10
1 is a fixed contact fixed to the stator, and 11 is an instantaneous tripping device that responds to an excessive current such as a short circuit current, which is constructed as a well-known electromagnetic device. 12
13 is an arc extinguishing chamber, and 13 is an arc runner for guiding the arc generated when the fixed contact and the movable contact are opened to the arc extinguishing chamber 12. 1
Reference numeral 4 denotes a bimetal mechanism constituting a long time tripping device, which is bent in the direction of the arrow in the figure by heat generation corresponding to the circuit current, and is driven by releasing the latch portion 15 of the drive mechanism 6 when it bends by a predetermined amount. Mechanism 6
is operated to release the movable contact 8 from the fixed contact 10. 16 is the above bimetal 14
and a flexible conductor 17 connecting the movable contactor 7 and the movable contact 7.
is an adjustment screw screwed onto the connection terminal 2, the tip of which passes through the connection terminal 2 and comes into contact with the tip 13A of the arc runner 13; by adjusting this adjustment screw, the connection terminal 2 The distance between the arc runner tip 13A and the bimetal 14 and the latch portion 15 can be adjusted.

Note that the lower end of the bimetal 14 and the tip 13A of the arc runner 13 are fixed by welding.
Further, the arc runner 13 is made of the bimetal 1
4 is fixed by welding, that is, the 4th
It is fixed to the connection terminal 2 by welding at a location 13B in the figure.

[Problem that the invention attempts to solve]

Since the conventional device was configured as described above, when adjusting the time limit of the bimetal 14, by rotating the adjusting screw 17 clockwise to widen the distance between the connecting terminal 2 and the arc runner tip 13A, the connecting terminal 2 and the arc Welding fixation point 13B with runner 13
Peeling force acts on the connecting terminal 2 and arc runner 1.
There was a risk that 3 and 3 would peel off. For this reason, it is necessary to fix the connecting terminal 2 and the arc runner 13 by expensive brazing or the like, which also hinders automation of assembly.

This idea was made to solve these problems, and it is possible to create a device that prevents the connection terminal from peeling off from the arc runner, uses an inexpensive welding method, and can be assembled automatically. This is what we provide.

[Means for solving problems]

The device according to this invention forms a protrusion at a predetermined location of the arc runner, and also cuts and raises a part of the connection terminal to form an L-shaped bent part whose tip extends in the direction of the bimetal. The above L
It is designed to be fixed to the inner surface of the letter-shaped bent portion.

[Effect]

In the device according to this invention, when the distance between the connecting terminal and the tip of the arc runner is widened by the adjustment device, the arc runner is pressed against the inner surface of the L-shaped bent part, and the connecting terminal and the arc runner Since a compressive force will be applied to the area where the connecting terminal and the arc runner are fixed, separation of the connecting terminal and the arc runner can be prevented. In addition, since the tip of the L-shaped bent portion extends in the direction of the bimetal, when the protruding portion of the arc runner is placed on the L-shaped bent portion, the protruding portion of the arc runner and the L-shaped fold Since the curved portion can be fixed, the fixing work becomes easy.

〔Example〕

An embodiment of this invention shown in FIG. 1 will be described below.

In this figure, 2A is an L-shaped bent part formed on the connecting terminal 2, which is perpendicular to the connecting terminal 2 by cutting and raising one side of the connecting terminal, as shown in the perspective view of the connecting terminal 2 in Figure 2. The part 21A bent to
It is composed of a portion 22A which is further bent from the tip of this portion and extends in the bimetallic direction, that is, upward in FIG. 2 and parallel to the connecting terminal 2. Furthermore, another similarly configured L-shaped bent portion 2B is formed on the other side of the connection terminal 2. 2C is a screw hole into which the adjustment screw 17 is screwed. Further, 13C is a protrusion formed on the arc runner 13, and as shown in the perspective view of the arc runner in FIG. One of the two protrusions 13C and 13D is shown in FIG. This arc runner 13 is combined with the connecting terminal 2 so that the two protrusions 13C and 13D are joined to the inner surfaces of the L-shaped bent parts 2A and 2B, respectively, and the protrusion 13C is connected to the L-shaped bent portions 2A and 2B.
There is also a protrusion 13D on the inner surface of the letter-shaped bent portion 2A.
Each is fixed to the inner surface of the character-shaped bent portion 2B by welding. In this case, the protruding part 13C is placed on the bent part 21A, and the protruding part 13D is placed on the bent part 21B, and the protruding part 13C is placed on the inner surface of the bent part 22A. is welded to the inner surface of the bent portion 22B, and each of the bent portions 21A and 21B functions as a supporting portion for work. Furthermore, the lower end of the bimetal 14 is welded to the tip 13A of the arc runner 13 as in the conventional case. As shown in FIG. 1, the adjustment screw 17 installed in the screw hole 2C of the connection terminal 2 is adapted to press the vicinity of the tip 13A of the arc runner to the right in the figure.

The rest of the configuration is the same as the conventional one, so the explanation will be omitted. When adjusting the time limit of the bimetal 14, use the adjustment screw 1 as in the conventional case.
Rotate 7 to the right. As a result, the distance between the connecting terminal 2 and the tip 13A of the arc runner is widened, and the upper end of the bimetal 14 is curved to the right in FIG. 1 for adjustment. In this case, the protruding parts 13C and 13D of the arc runner are both pressed against the inner surfaces of the L-shaped bent parts 2A and 2B of the connecting terminal 2, so the fixed parts of both, that is, the L-shaped bent parts 2A, 2B and arc runner protrusions 13C, 1
As a result of compressive force acting on the welded and fixed location with 3D, there is no fear of peeling.

[Effect of idea]

This idea is structured as above, so
Even if an inexpensive welding method is used, there is no need to worry about peeling.
It also makes it possible to automate assembly. Furthermore, since the L-shaped bent portion is configured to extend in the direction of the bimetal, when the protruding portion of the arc runner is fixed to the inner surface of the L-shaped bent portion, the protruding portion is bent into the L-shaped bent portion. Because it can be placed in
This makes the fixing work easier.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view showing an embodiment of this invention, Fig. 2 is a perspective view of a connecting terminal which constitutes the main part of this invention, and Fig. 3 is a perspective view of an arc runner which also constitutes the main part of this invention. The perspective view and FIG. 4 are schematic cross-sectional views showing a conventional configuration. In the figure, 1 is the base, 2 and 3 are connection terminals, 2A, 2
B is an L-shaped bent part, 4 is an operating handle, 5 is a link, 6 is a drive mechanism, 7 is a mover, 9 is a stator, 1
1 is an instantaneous tripping device, 12 is an arc extinguishing chamber, 13 is an arc runner, 13C and 13D are protrusions, 14 is a bimetal, 17 is an adjustment screw, and 20 is a spring. Note that the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) An operating handle, a drive mechanism that can control opening and closing of a fixed contact and a movable contact in conjunction with the operating handle, and opening and closing of both of the contacts. The arc runner has an arc runner that guides the arc that is generated during the arc to the arc extinguishing chamber, and a bimetal fixed to a predetermined part of the arc runner, and the drive mechanism can be operated to open both of the contacts in the event of an overcurrent. a bimetallic mechanism, a connection terminal to an external circuit, and an adjusting device for adjusting the distance between the arc runner and the connection terminal near a predetermined location of the arc runner, A protrusion is formed and a portion of the connection terminal is cut and raised so that the tip extends in the direction of the bimetal.
1. A circuit breaker characterized in that a letter-shaped bent part is formed, and the protruding part is fixed to an inner surface of the L-shaped bent part. (2) The circuit breaker according to claim 1 of the utility model registration, characterized in that the protruding portions formed on the arc runner protrude from both sides of the arc runner so as to form a cross shape. . (3) The circuit breaker according to claim 1 or 2, wherein the L-shaped bent portions are formed on both sides of the connection terminal.