JPH044528A - Formation of terminal base - Google Patents

Abstract

PURPOSE:To improve connection reliability and airtightness of a contact by putting a terminal plate on one metal mold, by arranging a resinous pressing member on the terminal plate, and by forming the metal mold in such a way that the other metal mold is abutted on the pressing member, when both of the metal molds are put together, so as to carry out injection molding. CONSTITUTION:After terminal plates 5-7 are put on one metal mold 8, and a resinous pressing member 4 is arranged on the terminal plates 5-7, the metal molds 8, 9 are formed in such a way that the other metal mold 9 is abutted on the pressing member 4 when both of the metal molds are put together, and injection molding is carried out. A pressing pin is thus unnecessary, and a hole due to the pressing pin will not be formed. Since the heat contraction generated at the time of cooling the injected resin is regulated by the pressing member 4, deformation and the like will not occur. Since the thickness of the injected resin becomes thinner, shrinkage will not occur, and formation at a high accuracy is achieved. The airtightness and the connection reliability of a contact can thus be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for molding a terminal base used for a switch having a plurality of contacts, such as a slide switch, a rotary switch, etc.

(Prior Art) This type of terminal base has conventionally been molded by insert molding, but when injection molding the base, as shown in FIG. 11, a plurality of terminal plates 31a and 31b are interconnected and integrated. Then, each terminal plate 3 is inserted into the injection space 34 formed by a pair of molds 32 and 33.
A presser pin 35 is protruded from one of the molds 33 and fixed so that 1a and 31b do not move. After the base is molded, the connecting portions 31x of each terminal board 31 are punched out together with the base to separate them.

(Problems to be Solved by the Invention) However, warpage may occur in the terminal plate 31 during molding.
There was a risk that hot water would form on the surface of the contact portion of the terminal board 31, and the contact reliability as a contact would be reduced. Furthermore, since the punched hole of the presser pin 35 remains in the base when the mold is released, airtightness may be impaired.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for molding a terminal base that has excellent airtightness and high contact reliability of the contacts.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a method for molding a terminal base in which a plurality of terminal boards are insert-molded so that some of the terminal boards are flush with the surface of the terminal base. After placing the plate on one of the molds and placing a resin holding member on top of the terminal board, when the other mold is put together, the other mold comes into contact with the holding member. A mold is constructed for injection molding.

(Example) Next, an example of the present invention will be described in more detail with reference to the drawings.

FIG. 5 shows a motor vehicle inhibitor switch to which the method according to the invention is applied. This inhibitor switch is
It is for detecting the shift position of the shift lever, and roughly consists of a terminal base 1, a case 10, and a slider 20.

6 on the side of one end of the terminal base 1.

As shown in FIG. 7, four socket portions 2a and 2b are formed, and a shaft hole 3 is formed at the other end.

Further, as shown in FIG. 10, terminal plates 5a to 5f, terminal plates 5a and 5b, and a terminal plate 7 are attached to the inner surface of the terminal base l facing the case 10.

These terminal boards 5a to 5f, 5a, 5b and the terminal board 7 are attached to the terminal base 1 in the following manner.

First, as shown in FIG. 5, the terminal blocks 58 to 5f are connected to each other via the connecting portion 5x, and the terminal blocks 6a and 6b are integrally connected to each other as the terminal block 6 through the connecting portion 6X. Form it into Then, the terminal block 5, the terminal block 6, and the terminal plate 7 are placed in the cavity mold 8, as shown in FIG. At this time, the contact part at one end of each terminal board 5a to 5f, 5a, 5b, 7 (the end near the shaft hole 3) is flush with the inner surface of the terminal base 1, and the terminal part at the other end is for the socket. It is placed so as to enter the predetermined positions of the recesses 2a and 2b.

Then, a presser plate 4 is disposed on the terminal blocks 5, 6 and the terminal plate 7, and a protrusion 8a protruding from the cavity mold 8 is fitted into the recess 4a of the presser plate 4 for positioning. This presser plate 4 is formed with a plurality of swirl holes 4b and an elongated protruding piece 4c. Next, when the core mold 9 is fitted to the cavity mold 8, the inner surface of the core mold 9 and the protruding piece 4c of the pressing plate 4 come into contact, and the terminal block 5.6 and the terminal plate 7 are pressed against the cavity mold 8. crushed by his body. Therefore, terminal block 5
, 6 and the terminal plate 7 will not warp or move.

After constructing the mold in this way, as shown in FIG. 2, injection molding is performed by pouring hot water through the gate 9a, and as shown in FIG. 3, the terminal base 1, terminal blocks 5, 6, and terminals are formed. The plate 7 and the pressing plate 4 are integrally molded. At this time, the wall thickness of the injected resin is reduced by the holding member 4, so no sink marks or warpage will occur during cooling ≦ Holes such as holding bottles will not be formed in the molded terminal base 1. Since there are no holes, airtightness is not compromised.

After molding, as shown in Figure 4, this terminal base 1
Each series, sheath part 5x, with its inner surface facing up.

6x is punched out with a press along with terminal base 1,
Each terminal board 5a, 5f, 6a, 6b is separated. This punching is performed with a smaller stroke than the terminal base 1. As a result, as shown in FIG. 4, the punched portion 1a does not fall off, but instead protrudes from the outer surface of the terminal base I.

remains (see Figure 5).

The case 10 houses the terminal base 1, and the case 10 has a shaft hole 11 concentric with the shaft hole 3 of the terminal base I, and a slider housing recess 12 on the inner surface facing the terminal base I. A packing groove 14 for accommodating a packing 13 is formed around the slider accommodating recess 12 and the shaft hole 11.

The slider 20 includes the terminal base 1 and the case IO.
It consists of a cylindrical shaft portion 21 that fits into each of the shaft holes 3 and 11, and an arm portion 22 that projects from the shaft portion 21. Contact plates 24a and 24b are accommodated in holes 23a and 23b provided in the surface of the arm portion 22 facing the terminal base 1, respectively. The touch plates 24a, 24b are urged by springs 25a, 25b in the direction of protruding from the holes 23a, 23b.

This slider 20 has its shaft portion 21 rotatably fitted into the shaft holes 3 and 11 of the terminal base l and the case 10, and its arm portion 22 accommodated in the slider accommodation recess 12, so that the contact plate 2- 4a is in pressure contact with the contact portion of the terminal plate 5a of the terminal base 1 and each of the contact portions of the terminal plates 5b to 5f and the terminal plate 7, and the contact plate 24b is in pressure contact with the contact portions of the terminal plate 6a and the terminal plate 6b. It is supposed to be done.

This slider 20 rotates around the shaft portion 21 when a shift lever of an automobile (not shown) is operated.
The shift position is detected when the contact point corresponding to the shift position of the shift lever becomes conductive.

(Effects of the Invention) As is clear from the above description, according to the present invention, a holding member is disposed on the terminal board so that when the molds are put together, the mold comes into contact with the holding member. Since there is no need for a presser bottle, there are no holes caused by the presser bottle, and airtightness is not compromised.

Furthermore, since no holding bottle is required, the mold structure becomes simple.

Furthermore, since the heat shrinkage effect that occurs when the injected resin cools is regulated by the pressing member, warping and the like will not occur. Furthermore, since the thickness of the injected resin is reduced, sink marks do not occur, and molding can be performed with high precision.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a molding die to which the terminal-based molding method of the present invention is applied, before closing, Fig. 2 is a cross-sectional view showing a state in which the molding die is closed and hot water is injected, and Fig. 3 is a cross-sectional view of the molding die before closing. FIG. 4 is a sectional view of the terminal base after being molded, FIG. 4 is a sectional view of the terminal plate of the terminal base after being punched out, FIG. 5 is an exploded perspective view of an automobile inhibitor switch to which the present invention is applied, and FIG.
The figure is an external view of the terminal base, Figure 7 is a front view of the socket part of the terminal base, and Figure 8 is 1-1 in Figure 7.
9 is a sectional view taken along the line ■--■ in FIG. 7, FIG. 10 is an inner surface view of the terminal base, and FIG. 11 is a sectional view showing a conventional molding die for the terminal base. DESCRIPTION OF SYMBOLS 1... Terminal base, 4... Holding plate (holding member), 5a-5f, 6a, 6b, 7. One terminal board,
8...cabin type, 9-...core type. Patent applicant Nishin Co., Ltd. Figure 1 Figure 3 Figure 6 Figure 1→ ←■ ■－呵■ Figure 1O Figure 11 Figure 31×

Claims (1)

[Claims] (1) In a terminal base molding method in which a plurality of terminal boards are insert-molded so that some of the terminal boards are flush with the surface of the terminal base, the terminal boards are placed on one mold, and the terminal boards are placed on top of the terminal base. A terminal base characterized in that after a resin holding member is disposed on the terminal base, the mold is constructed such that when the other mold is put together, the other mold comes into contact with the holding member, and injection molding is performed. molding method.