JPH0418191Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The invention is a circuit or disconnection device in which the heating element of a thermal trip device is fixed to the terminal on the load side by brazing. Regarding terminal devices.

(Prior art) In recent years, with the miniaturization of circuits and disconnectors, the heating element (heater) that operates the thermal element (bimetal) of the thermal trip device is used in the terminal device on the load side of the circuit. They tend to be integrated as part of the In this case, various methods such as screw tightening, brazing, etc. can be considered, but brazing is often used because the space inside the circuit or disconnector is generally narrow and space-wise.

FIG. 6 shows an integrated terminal device using such brazing. In Figure 6, 1 is a terminal, 2
is a heating element, and one end of this heating element 2 is connected to terminal 1.
It is stacked on top and secured by brazing. 3 is a screw hole for connecting an external conductor (not shown);
This is formed by threading so as to penetrate the heating element 2 and the terminal 1 after brazing.
4 is a screw hole formed in the terminal 1 for fixing to the main body case (not shown), 5 is a screw hole formed in the heating element 2 to be fixed to the main body case (not shown), and these screw holes 4 and 5 are also after brazing. It is formed by thread processing.

(Problem to be solved by the invention) By the way, when automatically brazing the terminal 1 and the heating element 2, it is first necessary to position them. These end faces 1a and 2a with
The process was carried out by contacting a jig (not shown).

However, since the terminal 1 and the heating element 2 are formed by press punching (the heating element 2 is then bent), there are many cases where the end surfaces 1a and 2a have droop, burrs, etc. Therefore, in the above-described method of positioning using the end surfaces 1a and 2a as reference surfaces, the relative positional relationship between the terminal 1 and the heating element 2 may be distorted due to droop, burrs, etc., and as a result, the position of both may be misaligned. There was a problem in that the dimensional accuracy of the terminal device deteriorated because the terminal device was stuck in place. In addition, if the screw hole 3 is formed before brazing, the solder will leak through the screw hole 3 during brazing.
As it enters the inside and solidifies, it causes the problem that the screw cannot be tightened. Therefore, the screw hole 3 has to be formed after brazing, and the process of pressing, cleaning, brazing, thread processing, cleaning, and assembly is required. There was also the problem that the processing process became complicated.

Therefore, the purpose of this invention is to make it possible to braze the terminals and heat generating elements with burrs or other burrs in the correct position, thereby achieving high dimensional accuracy and making it possible to make screw holes before brazing. To provide a terminal device for a circuit or disconnector in which wax does not enter into a screw hole even when a screw hole is formed.

[Structure of the invention] (Means for solving the problem) The terminal device of the circuit switch or disconnector of the invention includes a projecting cylindrical part and an outer conductor formed on the inner circumference of the cylindrical part. A terminal having a female thread for screwing a screw to be installed, and a fitting hole, which is stacked on the terminal so that the fitting hole is fitted with the outer circumference of the cylindrical part, and the overlapping surfaces are brazed together. The heating element of the thermal trip device is fixed to the heating element of the thermal trip device.

(Function) Since the terminal has a protruding cylindrical portion, by fitting the fitting hole of the heating element to the outside of this cylindrical portion, the heating element can be positioned in the terminal, and the heating element can be positioned in the terminal. Even if a female thread is formed before attachment, wax can be prevented from entering the threaded portion.

(Example) Hereinafter, Figures 1 to 5 will be described for an example of the present invention.
This will be explained with reference to the figures.

First, in FIG. 5, which shows a partially broken view of the load side of the circuit breaker, 11 is a base, 12 is a cover, 13 is a handle, and 14 is an opening/closing mechanism operated by the handle 13. Reference numeral 15 denotes a thermal tripping device, which is composed of a bimetal 16 and a heater 17 as a heating element. Reference numeral 18 denotes an electromagnetic tripping device, which consists of an armature 19, a yoke 20, and a spring 21. The opening/closing mechanism 14 has a function of tripping and opening the circuit when the thermal tripping device 15 or the electromagnetic tripping device 18 is activated due to an overcurrent. 22 is a terminal fixed to the base 11 with screws 23. This terminal 2
The heater 17 is fixed to the terminal device 2 by brazing to form a terminal device 24 as shown in FIG. Reference numeral 25 denotes an external conductor connected to the circuit or disconnector, which is fastened and fixed to the terminal device 24 by screws 26. 27 is a screw for fixing the tip of the heater 7 to the base 11.

Now, the terminal device 24 will be explained with reference to FIGS. 1 to 4.

First, the terminal 22 is punched out using a press into an external shape as shown in FIG. 4, and then a cylindrical portion 28 is protruded from the center by, for example, burring. Note that the protruding height of the cylindrical portion 28 is set smaller than the plate thickness of the heater 17. Then, a female screw 29 for screwing the screw 26 is formed on the inner circumferential surface of the cylindrical portion 28, and a screw hole 30 for screwing the screw 23 at the two right corners of the terminal 22 in the figure. is formed. On the other hand, the heater 17 is formed by punching with a press and then bending into the shape shown in FIG. The screw 27 is formed on the other end side of the hole.
A screw hole 32 for screwing is formed. To braze the terminal 22 formed as described above and the heater 17, as shown in FIGS. 1 and 2, the fitting hole 31 is fitted to the outside of the cylindrical part 28, 17 is placed on top of the terminal 22. Then, with the cylindrical portion 28 and the fitting hole 31 in a positioning state by fitting, the terminal 22 and the heater 17 are set in a mounting jig of a brazing device (not shown), and solder is applied between the overlapping surfaces of the two. Braze it so that it penetrates. As a result of the above, terminal 2
A heater 17 is fixed to 2 to form a terminal device 24 as shown in FIG.

According to the above configuration, when brazing is automatically performed, the fitting holes 31 of the heaters 17 are fitted into the cylindrical portions 28 of the terminals 22 to position them, so that burrs can be avoided. Unlike the case where the end face with the burr is used as a reference plane for positioning, the heater 17 can be accurately positioned with respect to the terminal 22 without being affected by the burr or the burr, and both can be fixed with high dimensional accuracy.

Further, according to this embodiment, since the cylindrical portion 28 protrudes beyond the upper surface of the terminal 22, which is the brazing surface, the solder that enters between the terminal 22 and the heater 17 during brazing may further protrude from the cylindrical portion. Inside 28 (female thread 29)
There is no risk that the wire will penetrate into the hole, and therefore, even if threading is performed in the process before brazing as in this embodiment, there will be no problem.

[Effects of the invention] As described above, the present invention provides a terminal with a protruding cylindrical part for forming a female thread for screw threading, and a fitting fitted to the outside of this cylindrical part on the heating element. Since the mating hole is formed, the terminal and the heating element can be positioned by fitting the cylindrical part and the mating hole, and therefore the end face where there is a risk of burrs or burrs can be used as a reference plane. Unlike when positioning, it is possible to position correctly without being affected by burrs or burrs, and the terminal and heating element can be brazed with high dimensional accuracy.This cylindrical part also prevents wax from entering the female thread during brazing. Since intrusion can be prevented, press working and screw working can be performed before brazing, and the working process can be simplified.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a perspective view of a terminal device, FIG. 2 is an enlarged longitudinal sectional view of the terminal device, and FIG. 3 is a perspective view of a heater.
FIG. 4 is a perspective view of the terminal, and FIG. 5 is a partial longitudinal sectional view of the circuit breaker. Furthermore, Figures 6 to 8 show conventional examples; Figure 6 is a diagram equivalent to Figure 1, Figure 7 is a diagram equivalent to Figure 3, and Figure 8 is a diagram equivalent to Figure 4. be. In the drawings, 17 is a heater (heating element), 22 is a terminal, 24 is a terminal device, 25 is an external conductor, 26 is a screw, 28 is a cylindrical portion, 29 is a female screw, and 31 is a fitting hole.

Claims (1)

[Scope of utility model registration request] A protruding cylindrical part, a terminal formed on the inner periphery of the cylindrical part and having a female screw for screwing a screw for attaching an external conductor, and a fitting hole, which is connected to the cylindrical part. A terminal device for a circuit or disconnection device comprising a heat generating element of a thermal trip device which is overlapped with the terminal so as to fit with the outer peripheral part of the terminal and fixed by brazing between the overlapping surfaces.