JPS6136353B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for connecting a lead wire to a terminal and a method for connecting the lead wire to a terminal. At the end of the lead wire 5, a protrusion 23 for biting into the lead wire 5 is provided, and a through hole 2 is bored in the folded part of the terminal board 1, and the core wire 4 is covered with a synthetic resin coating 3 up to the end. is inserted into the through hole 2, the sheathing 3 at the end of the lead wire 5 is caulked between the folded terminal plates 1, and the core wire 4 at the end is welded to the terminal plate 1. The first invention is a connection structure for connecting a wire to a terminal, in which the terminal board 1 is folded back and a protrusion 23 for biting into the coating 3 of the core wire 4 is protruded on at least one of the upper inner surface and the lower inner surface. At the same time, a through hole 2 is bored in the folded part of the terminal plate 1, and the end of the lead wire 5, which has the core wire 4 covered with a synthetic resin coating 3 up to the end, is inserted into the through hole 2. The ends are placed between the folded terminal plates 1, and then the terminal plates 1 are clamped by welding parts 6a and 6b of the welding equipment disposed above and below the terminal plates 1, and the lead wires 5 are placed between the terminal plates 1. A second method for connecting a lead wire to a terminal is characterized in that the sheathing 3 is caulked and at the same time the sheathing 3 is melted at the welding parts 6a and 6b to weld the core wire 4 inside the sheathing 3 and the terminal plate 1. It is considered an invention.

Conventionally, for example, in the operation spring of an electromagnetic relay, as shown in FIGS.
First, use the press 9 to crimp the terminal plate 7 and the lead wire 5.
Then, the bare core wire 4 at the tip of the lead wire 5 was welded to the terminal plate 7 using a welding machine 10. However, in such a conventional example, in order to weld the lead wire to the terminal board, the covering of the lead wire must be removed with a nipper or stripper, which requires a peeling operation, and the nipper or stripper may bite into the lead wire. This has the disadvantage of damaging the core wire of the lead wire and causing breakage during operation.Furthermore, if the core wire of the welded part breaks during operation, the broken core wire will fall downward, causing damage to the operating spring of an electromagnetic relay, for example. A lead wire welded to a terminal board has the disadvantage that the broken core wire falls onto the contact point below, which adversely affects electrical performance, such as poor withstand voltage of electrical equipment. In addition, since the terminal plate is caulked to the cover using a press, and then the core wire is welded to the terminal plate, two machines, a press and a welding device, are required for caulking and welding, and two processes are also required. It was hot.

The present invention has been made in view of the above-mentioned conventional drawbacks, and the first object of the invention is to prevent the core wire from breaking during operation, and even if the core wire does break, the broken core wire can be prevented. It is an object of the second invention to provide a structure for connecting lead wires to terminals that does not fall and does not adversely affect electrical performance such as poor withstand voltage. It is unnecessary and can reduce the number of processes, and since welding and caulking can be performed with one device, the number of types of equipment can be reduced, and the two processes of caulking and welding can be performed in one process, which can reduce the number of processes. The present invention provides a method for connecting lead wires to terminals.

The present invention will be explained in detail below with reference to the accompanying drawings. 11 in the diagram
is the operating part of the electromagnetic relay shown in FIG. It is a metal plate, with a terminal plate 1 at the base end and an operating spring 12 at the distal end. This metal plate and a synthetic resin spring fixing part 13 are molded at the same time, and a common contact 14 is provided at the distal end of the operating spring 12. is installed. This terminal board 1 is folded back in a substantially U-shape, a through hole 2 is bored in the folded part of the terminal board 1, and projections 23 are provided on the upper and lower inner surfaces of the terminal board 1, respectively. There is. The protrusion 23 may be provided only on either the upper inner surface or the lower inner surface of the terminal plate 1. A terminal in which the end of a lead wire 5 whose core wire 4 is covered with a synthetic resin coating 3 up to the end is inserted into the through hole of the terminal plate 1 without removing the coating 3, and the end is folded back. Place it between the boards. At the top and bottom of this terminal plate 1 are welded parts 6 of a welding device such as a resistance welding machine.
a, 6b are arranged, and in the resistance welding machine, the welding parts 6a, 6b serve as electrodes. This welded part 6
When the terminal plate 1 is pressed in the vertical direction with a and 6b, the protrusion 23 bites into the sheathing 3 of the core wire 4, the sheathing 3 is melted and torn by the heat, a welding current flows between the welded parts 6a and 6b, and the terminal plate 1 and The exposed core wire 4 is spot welded, and at the same time the sheath 3 is caulked between the terminal plates 1. By welding without using solder or the like in this manner, contact failure due to flux or the like is eliminated, and by caulking and pressing the covering, motion and vibrations generated during operation are not transmitted to the core wire 4, improving connection reliability. Furthermore, since the protrusions 23 protrude from the inner surface of the terminal plate 1, when welding the lead wire 5, the welding current concentrates on the protrusions 23 that have bitten into the sheathing 3, and the contact between the terminal plate 1 and the core wire 4 is reduced. improve,
The contact position is also stable. Note that it is also possible to use an ultrasonic welder as the welding device. In this case, the welded parts 6a, 6b are the vibrating rod and the anvil.
Since the terminal plate 1 is welded to the core wire 4 from above the sheathing 3 in this way, there is no need to remove the sheathing 3 from the lead wire 5, which has the advantage of omitting the process of peeling off the sheathing and speeding up assembly. be.
Furthermore, since there is no need to use a nipper or stripper to peel off the covering 3 to expose the core wire 4, the core wire 4 will not be damaged by the nipper or stripper, etc., and the core wire 4 will not break during operation. The advantage is that there is almost no Furthermore, since welding of the core wire 4 and caulking of the sheathing 3 can be performed with one welding device, two machines, the press 9 and the welding machine 10, are not required as in the conventional case.
Only one welding device is required for caulking and welding, which reduces equipment costs, and the conventional two processes of caulking and welding can be performed in one process, reducing the number of processes and speeding up assembly. It has the advantage of being able to In addition, since the terminal plate 1 and the core wire 4 are welded together with the core wire 4 covered with the covering 3, even if the core wire breaks, the broken core wire 4 will not fall downward, unlike the conventional method. There is no fear that a broken core wire may fall onto the contact portion 15 and adversely affect electrical performance, such as poor withstand voltage, and reliability is improved.

Reference numeral 16 in FIG. 7 is a rotatable armature, and the spring fixing portion 13 is fixed to the armature 16 via an insulating sheet 17 by heat caulking.
When the coil 18 is energized, the armature 16 is attracted toward the coil 18, and the common contact 14 attached to the operating spring 12 presses against the normally open contact 19 of the contact portion 15, and the coil 18 is energized. When not in use, the common operating point 14 is biased by a return spring 21 made of stainless steel and pressed against the normally closed contact 20. Reference numeral 22 is an insulation deterioration prevention groove that prevents short circuits caused by contact powder.

As described above, the first invention has the advantage that the core wire hardly breaks during operation, and even if the core wire breaks, the broken core wire does not fall, improving the reliability of electrical equipment. have. Furthermore, since a protrusion is provided on either the top or bottom of the folded terminal board to bite into the core wire sheathing, the end of the lead wire without removing the sheath can be inserted between the terminal boards. Even if the terminal plate is crimped and welded to the core wire, the welding current will concentrate on the protrusion that has bitten into the sheath, improving the contact between the terminal plate and the core wire, and ensuring welding between the terminal plate and the core wire. This has the advantage that the contact position is also stable.
In addition, the second invention does not require removing the coating from the lead wire as described above, reducing the process of removing the coating, and also allows welding and caulking to be performed with one device, reducing equipment costs. It has the advantage that tightening can be done in one step, reducing the number of steps.

[Brief explanation of the drawing]

Figures 1a, b, c, d, and e are partially cutaway side views showing a conventional example, Figure 2 is a partially exploded perspective view showing an embodiment of the connection structure of the first invention, and Figure 3. a, b, and c are partially cutaway side views showing the connection method as above; FIG. 4 is a partially cutaway enlarged side view of the same terminal board as above; FIG. 5 is a partially cutaway perspective view of the electromagnetic relay; Figure 6 is a side view showing section A in Figure 5;
This figure is a side view showing part B in FIG. 5, in which 1 is a terminal plate, 2 is a through hole, 3 is a coating, 4 is a core wire, 5 is a lead wire, and 6a and 6b are welded parts.

Claims (1)

[Scope of Claims] 1. A projection for biting into the core wire coating is provided on at least one of the upper inner surface and the lower inner surface of the terminal board folded back in a substantially U-shape, and the projection penetrates the folded portion of the terminal board. A hole is drilled, the end of the lead wire whose core wire is covered with a synthetic resin coating up to the end is inserted into the through hole, and the end of the lead wire is caulked between the folded terminal plates. A structure for connecting a lead wire to a terminal, characterized in that the core wire at the end is welded to the terminal plate. 2. Fold back the terminal board and provide a protrusion on at least one of the upper inner surface and lower inner surface thereof to cut into the covering of the core wire, as well as drill a through hole in the folded portion of the terminal board, and cover with synthetic resin. The end of the lead wire covered with the core wire up to the end is inserted into the through hole, and the end is positioned between the folded terminal plates, and then welding is performed using welding equipment disposed above and below the terminal plates. A terminal for a lead wire, which is characterized in that the terminal plate is clamped at a portion to caulk the sheathing of the lead wire between the terminal plates, and at the same time, the sheath is melted at a welding portion to weld the core wire inside the sheath and the terminal plate. How to connect to.