JPH01304623A - Manufacture of switch case - Google Patents

Abstract

PURPOSE:To prevent terminals from coming into contact with each other due to a molding pressure by inserting a spacer from a coupler unit so as to position the terminals arranged at an intermediate layer. CONSTITUTION:Terminals 2 through 5 in an insert plate state are previously set inside a space surrounded by an upper mold 15 and a lower mold 16. They are positioned by means of pins planted on the respective mold surfaces. A slide mold 17 is inserted into the tips of the terminals 2 through 5 sidewardly. The inside of the slide mold 17 extends so as to form a spacer 8 for inserting between the terminals 4 and 5. Therefore, resin is injected into the mold with this state kept intact so that a terminal base with the terminals 2 through 5 inserted can be molded. Thereat, the terminals 4 and 5 are positioned by means of the spacer 8, thereby preventing contact with each other due to a molding pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a switch case in which terminals are laminated in a plurality of layers in the vertical direction by insert molding.

[Prior Art] When inserting a terminal into a terminal base constituting a switch case, conventionally, an insert plate is provided in which a plurality of terminals installed in parallel are integrated by a connecting part, and a plurality of insert plates are arranged vertically at appropriate intervals. After placing the terminals in the mold of the terminal base and positioning them in the mold using a bottle etc., insert the intermediate parts into the resin, and use one end as a fixed contact exposed inside the terminal base. The terminal base is molded so that the end portion is a terminal that protrudes into a coupler portion that is integrally formed with the terminal base.

[Problems to be Solved by the Invention] By the way, for example, when there are four terminal layers, the two terminals in the middle layer are positioned from the upper and lower mold directions, so that they do not come into contact with each other due to the molding pressure. There is a risk of it getting lost.

Therefore, an object of the present invention is to provide a molding method that does not have such a risk.

[Means for Solving the Problems] In order to solve the above problems, in the present invention, when positioning the terminals in the mold, a spacer is inserted between the terminals forming an intermediate layer from the coupler direction, and removed after molding. It is characterized by

[Operation of the Invention] When the spacer is inserted from the coupler direction, its tip enters between the terminals forming the intermediate layer, and the distance between them is kept constant. Therefore, when insert molding is performed, the terminals are prevented from moving and coming into contact with each other due to the molding pressure.

[Example] 1 to 5 show an embodiment of the present invention.

This embodiment is an example of a heater fan switch for an automobile, and FIG. 1 shows a longitudinal section of this switch, and FIG. 2 shows a method for installing this switch. As shown in these figures, there is a terminal base 1 made of resin and opening upward in the figure, and terminals 2 or 2 formed inside the terminal base 1 in a plurality of layers (four layers in this example) overlapping vertically at appropriate intervals. 5, a cover 6 that covers the opening of the terminal base 1, and a slider 7 accommodated in the terminal base 1.
and a lever 8 for sliding this.

A knob 8a is attached to the tip of the lever 8.

The slider 7 is rotatable around a boss 9 integrally projecting from the cover 6, and a click mechanism 10 formed between the cover 6 and the slider 7 provides moderation to the movement of the slider 7. 11 is a movable contact provided on the slider 7, and 12 is a fixed contact formed by extensions of the terminals 2 to 5.

This heater fan switch is as shown in Figure 2.
The terminal base 1 is engaged with and attached to a retaining portion B1 protrudingly formed on a base material B of an instrument panel of a vehicle body by a hook portion 1a provided on a side portion of the terminal base 1.

As shown in FIGS. 3 and 4, the terminal base 1 includes a coupler part 1b surrounding one end of the terminals 2 and 5 forming the coupler terminals, an insert part IC into which the terminals 2 to 5 are inserted into the upper and lower parts, and a slider 7. It consists of a recess 1d for accommodating.

The insert part IC has a punched hole 1 that passes through it in the vertical direction.
3 is formed. During insert molding of the terminals 2 to 5, the punched holes 13 are formed in each layer, for example, as shown in FIG. 3, as shown in FIG. This hole is formed in order to subsequently cut the connecting portion J and separate the terminals 2.

In addition, this punched hole 13 is located at a position as close as possible to the coupler portion lb side than the fixed contact 12 side in the insert portion IC, that is, the distance from the punched hole 13 to the end on the fixed contact 12 side, and the distance between the coupler portion lb The distance ii to the side end is formed at the position where the sentence <sentence 2 is formed.

Furthermore, a rib 14 is provided on the upper surface of the insert part IC to surround the punched hole 13 and to separate it from the fixed contact 12.

When the terminal base 1 is configured in this way, the punched hole 13 is formed at a position far from the fixed contact 12, and the rib 14 is provided upright around the punched hole 13, so that the inside can pass through the punched hole 13. Fixed contact 1 to remove intruded dirt
The interior is dust-proof by entering the second side.

Next, the molding method will be described. As shown in FIG.
In the space surrounded by the lower mold 16, terminals 2 to 5 in the form of insert plates are set in advance.

Although these are not shown, they are positioned by bottles implanted from each mold surface. Furthermore, a slide mold 17 is inserted from the side into the tip portions of the terminals 2 and 5, that is, the portion forming the coupler portion 1a. The inner side of the slide mold 17 further extends to form a spacer 18 that is inserted between the terminals 3 and 4. Therefore, if resin is injected into the mold in this state and molding is performed, the terminal base 1 into which the terminals 2 to 5 are inserted can be molded. At this time, since terminals 3 and 4 are positioned by the spacer 18,
Molding pressure also prevents contact between the two. after that,
The terminal base 1 is obtained by opening the upper mold 15 and the lower mold 16 and retracting the slide mold 17 laterally.

[Effects of the Invention] According to the present invention, since the spacer is inserted from the coupler portion to position the terminals of the intermediate layer, it is possible to avoid a situation in which these terminals come into contact with each other due to molding pressure, and the yield of the product is improved.

[Brief explanation of the drawing]

Figures 1 to 5 show examples, and Figure 1 is the I of Figure 2.
- I line sectional view, Figure 1 is an explanatory diagram of the heater fan switch, Figure 3 is a plan view of the terminal base, Figure 4 is the
FIG. 5 is an enlarged sectional view taken along the line IV-IV in the figure, and FIG. 5 is an enlarged sectional view of the main part showing the molding process. (Explanation of symbols) 1...Terminal base, 2.3.4.5...Terminal, 15...Upper mold, 16...Lower mold, 17...
Slide type, 18...spacer.

Claims (1)

[Claims] Multiple terminals are stacked vertically at appropriate intervals in a resin terminal base, and the middle part is inserted to form a punched hole that penetrates the terminal base from the front and back, and one end is exposed inside the terminal base. In a method for manufacturing a switch case with a fixed contact and a coupler terminal with the other end exposed outside the terminal base, prior to insert molding the terminal, a spacer is inserted from the coupler direction to position the terminal located in the middle. and then insert molding of the terminal base is performed.