JPS59101723A - Push type switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a push-type switch that performs a switching operation by pressing the center portion of a reversely curved movable piece. Conventionally,
Many switches of this type are used, but in order to obtain a pusher switch with high insulation properties, it is necessary to ensure a sufficient insulation creepage distance. Magnify this effect□
, it is necessary to enlarge the plane area occupied by the switch. This leads to an increase in material costs and an increase in the size of the switch body, making it difficult to obtain a low-cost and highly reliable switch. In addition, in recent years, with the demand for versatility, there has been a demand for products that can improve electrical insulation, especially in high humidity environments or under conditions such as water injection or immersion. However, a structure that facilitates drying could not be obtained.

The present invention seeks to provide a bush type switch that satisfies these requirements.

The following will be explained based on the drawings. Fig. 1 shows an example of a conventional bushing type switch, and (1) is a recessed part (
(4) is a movable contact support part with a contact part exposed at the corner and has a mounting leg (5), (2) is a fixed terminal exposed at the center of the recess (4), and (6) is a curved contact piece support part. The movable contact piece (6) is made of metal and is housed in the recess (4) of the base (3), and is always in contact with the movable contact support part (1). (7) is a button that presses the movable contact piece (6), and its attachment to the base body (3) is restricted by the attachment frame (8). And button (7)
When the button (7) is pressed, the curved movable contact piece (6
), the center part of the movable contact piece (6) is reversed, comes into contact with the fixed terminal ( ), and opens again. Button (7) returns to its original position. In such a conventional switch, the distance between the movable contact piece support part (1), which is in constant contact with the movable contact piece (6), and the fixed terminal (2) in the center allows the switch itself to be made smaller. As the distance increases, problems with insulation remain.

If the distance, which is the insulation creepage distance, is increased, the planar area must be increased in such insert molding. In addition, the environmental conditions for using this type of switch are as follows:
In environments with high humidity, water injection, or flooding, once water is present, it is difficult to drain and dry it, and the base between the movable contact support part (1) and the fixed contact (2) may be damaged. There was a risk that the insulation of the part (3) would deteriorate and become defective.

The present invention was made to eliminate such drawbacks,
As shown in FIG. Ql is a terminal piece on the movable contact side, and the movable contact support part (10a) is formed in a circumferential shape, and the curve perpendicular to the movable contact support part (10a) has an angle. Although it is buried in the base body Q2, as shown in FIG. 3C, the movable contact piece supporting portion (ioa) is always in contact with the curved movable contact piece aυ. It is a button that is held in place by a fishing part (13a) in a hanging hole (12a) of a base body a in a pressing manner.A movable contact piece support part (10a) and a fixed contact (9
An annular groove (14) made of a synthetic resin insulating material is formed between the annular groove (14) and the base 4 (FIG. 3B, O).
12 The opening to the outside (+5) (Fig. 4) has a lid (16
) is provided at the corner (160L) of the lid (16).
is a thin part and can be easily removed.

Then, when you press the button (+3), the curved movable contact piece a
When υ is reversed, the movable contact piece aυ comes into contact with the fixed terminal (9a), and when the pressure is released, the movable contact piece (ill) and the button (13 return to their original positions due to the spring properties of the movable contact piece Qll). Thus, in the present invention, the arrangement of the movable contact piece support part (10a) and the fixed contact point (9a) is not formed on a plane as in the conventional case, but is arranged through an annular groove (14). Since the flat area of the switch itself is expanded,
It is possible to ensure a sufficient insulation creepage distance depending on the depth of the annular groove (14). Furthermore, water droplets adhering to high humidity, water injection, and water droplets stagnation due to surface tension generated between the movable contact piece αυ and the base body (12) are quickly guided to the annular groove (14), which is provided on the outer surface of the base body α. The fixed terminal (9a) is formed into a pointed shape, so the water drainage effect is even better.The formation of the opening (15) also improves air permeability. To improve the base atr
The interior is easy to dry, so the electrical insulation recovers quickly.

This type of switch is often installed on a printed circuit board etc. for assembly, but as shown in Figure 3A, the cover aω provided on the outer surface of the base tta is used for soldering when soldering or resin insulating coating is applied. Since there is a possibility that flux or coating resin may spread out from the opening (15) and cause contact failure, this is effective in preventing contact failure within the base body. After the assembly is completed, the lid (16) is removed from the corner (16 (lj)) of the thin wall portion to form the water droplet discharge opening (+5) described above. There is no deterioration in insulation performance even when the area is reduced, and electrical insulation quickly recovers even under conditions of high humidity, water injection, etc., and there is no possibility of poor contact when installing printed circuit boards during assembly work. The object of the present invention is to provide a bushing-type switch that is accident-free, highly reliable, compact, and low-cost.

[Brief explanation of the drawings] Figure 1 is an exploded perspective view of a conventional switch, Figures 2 to 4
The figures up to the figures show the switch of the present invention, Fig. 2 is a perspective view of each terminal piece, Fig. 3A is an exploded perspective view, Fig. 3B is a top view of the main parts, and C.
4 is a sectional view of the main part, and FIG. 4 is a perspective view of the main part during use. (1): Movable piece support, (2): Fixed terminal, (3) Two bases, (4): Recess, (51: Mounting leg, (6): Movable piece, (71: Button, (8): Mounting frame, (9): Fixed contact piece, (9a): Fixed terminal, QI: Movable contact piece, (1
0a): Movable contact piece support part, 06): Supervisor (f6Q)
:Kakuo

Claims (1)

[Claims] A fixed terminal piece having at least one contact point facing the center part of the movable piece in a push-type switch that performs a switching operation by pressing the center part of a curved movable piece having a reversing function, and the movable piece. Each terminal is insert-molded into a base made of a synthetic resin insulating material so that an annular groove is provided between the peripheral edge of the terminal piece and the opposite terminal piece forming the movable piece support part, and a cover part is provided on the side surface of the base body. , a one-type push switch capable of blocking and removing the opening of the annular groove to the outside of the base body.