JPH0336007Y2 - - Google Patents

Abstract

In the case of the switch contact design according to the invention, the contacts (15a, 17b) (which are normally closed or switched into the conductive state) of a monostable tumbler switch are produced from a base metal and are plated with a noble metal, while the contacts (15b, 17a) (which are normally open or are switched into the non-conductive state) are essentially produced from a noble metal, such as silver. Since a noble metal is used only for the normally open contacts (15b, 17a), cost savings are achieved. <IMAGE>

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a contact structure of a switch, mainly a contact structure of a switch for changing the rotational direction of a motor for use in a vehicle.

[Background of the idea]

Conventionally, in the contact structure of this type of switch, the same amount of noble metal such as silver has been used for both the switching contact where electrical switching is performed and the contact where only energization is performed. In other words, the amount of precious metals such as silver that do not cause any problems even when electrical switching is used for all contacts, and the cost of precious metals such as silver is extremely high, causing product prices to rise. Furthermore, the market prices of precious metals such as silver tend to fluctuate, making it difficult to set product costs.

[Purpose of invention]

The purpose of the present invention is to provide a contact structure for a switch that eliminates the problems of the conventional structure described above, lowers the product price, and reduces the influence of fluctuations in the price of precious metals.

[Summary of the idea]

In order to achieve this objective, the present invention is characterized by using a precious metal such as silver only for the switching contacts, and using an inexpensive material such as plating with a precious metal such as silver for the contacts that only conduct electricity. do.

[Example of idea]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of a switch embodying the present invention, and this switch constitutes the portion of the circuit surrounded by broken lines in the circuit diagram shown in FIG. or,
Figures 3 and 4 show the A part of this circuit and the 5th part.
FIG. 6 also shows part B.

1 in the figure is the upper case, and this upper case 1
is equipped with a support shaft 3 whose end portion is inserted into the locking hole 2, and the support shaft 3 is inserted into the insertion hole 4a of the lever 4 to rotatably hold the lever 4. or,
An opening 5 with a top surface 5a shaped like a parallel arc is provided on the top surface of the upper case 1, and an operator 7 for operating the lever 4 is attached to the head of the lever 4 through a waterproof cover 6 on the top surface 5a. Built-in, the mechanism is a seesaw type.

Further, a pair of driver housing portions 4 are provided at the lower end of the lever 4.
b, 4b are formed, and a drive element 9 having a spherical tip and urged downward by a coil spring 8 is accommodated in the housing portions 4b, 4b with its tip protruding.

On the other hand, numeral 10 in the figure is a lower case that engages with the upper case 1 to form a switch casing, and the lower case 10 has a central terminal 11 on the bottom surface with an L-shaped vertical portion 11a. , fixed contact receivers 12a formed at each end in mutually opposite directions,
A first fixed terminal 12 with a fixed contact receiving portion 12a and a second fixed terminal 13, 13, which is formed in a U-shape and whose upper surface has a fixed contact receiving portion 13a, are connected to the terminal 14 through a through hole drilled in the installation surface. , 14... First fixed terminal 12 and second fixed terminal 13, 13
Fixed contacts 15a, 15b are fixed to the fixed contact receivers 12a, 13a, respectively, and among these fixed contacts 15a, 15b, the fixed contact 15b attached to the first fixed terminal 12, which serves as a switching contact, is made of silver. The fixed contact 15a attached to the second fixed terminal 13, which serves as a contact for only energizing, is made of an inexpensive material plated with silver.

Further, 16 in the figure is a conductor plate bent in a dogleg shape, and this conductor plate 16 is supported by a support portion 11b formed on the vertical surface portion 11a of the central terminal 11, and uses this support portion 11b as a fulcrum. It is designed to operate as a. Movable contacts 17 are provided at both ends of this conductor plate 16.
A and 17b are fixed respectively, but among these movable contacts 17a and 17b, silver is used for the movable contact 17a corresponding to the fixed contact 15b, and the movable contact 1 corresponding to the fixed contact 15a performs only energization.
For 7b, an inexpensive material with silver plating is used.

Note that the fixed contact 15 serves as a contact that only conducts current.
It is also possible to eliminate the existence of the movable contact a and the movable contact 17b, and form protrusions on the ends of the second fixed terminal 13 and the conductor plate 16 and apply silver plating. The protrusions may also be omitted and silver plating may be applied directly.

Here, to explain the operation of this switch, the states shown in FIGS. 3 to 6 are obtained by operating the operator 7, and when the operator 7 is tilted to the right as shown in FIG. 16 falls to the opposite side using the support portion 11b of the central terminal 11 as a fulcrum, and at this time the other conductor plate 16 continues in its conventional state as shown in FIG. This means that the motor M starts rotating with the A side in FIG. 2 switched to the line indicated by the broken line. Also, when the operator 7 is tilted to the left, the situation is completely opposite to that described above, and the line shown by the broken line on the B side is formed, and the motor M
starts rotating in the opposite direction.

Furthermore, Fig. 7 is an exploded perspective view of an embodiment in which the present invention is applied as a power window switch for an automobile.In Fig. 7, parts not shown in the previous embodiment are explained as follows: 20 is a waterproof Cap, 21
is a fixed plate, and 22 is a link attached to the fixed plate 21. Further, 23 is a slider, 24 is a lever assembled to the slider 23, and 25 is a wire-wound spring for controlling the lever 24. Furthermore, 26 is a guide plate, 27 is a tongue spring engaged with the guide plate 26, 28 is a tongue pin, 29 is a movable contact piece, and 30 and 31 are common terminals.

[Effect of idea]

As mentioned above, according to the present invention, precious metals such as silver are used only for the switching contacts, and inexpensive materials such as precious metal plating are used for the contacts that only conduct electricity, so the product price is low. become something,
In addition, it is less affected by market fluctuations in precious metals such as silver.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a switch embodying the present invention, Fig. 2 is a circuit diagram for explaining the operation of the switch, and Fig. 3 is a cross section of the switch in the solid line state on the A side in Fig. 2. 4 is a cross-sectional view of the switch in the same broken line state, FIG. 5 is a cross-sectional view of the switch in the solid line state on the B side, FIG. 6 is a cross-sectional view of the switch in the same broken line state, and FIG. FIG. 1 is an exploded perspective view of the present invention applied to a power window switch for an automobile. 15a...Fixed contact that only conducts current, 15b
. . . A fixed contact that serves as a switching contact, 17a . . . A movable contact that serves as a switching contact, 17b . . . A movable contact that only conducts current.

Claims (1)

[Claims for Utility Model Registration] A central terminal portion fixed to approximately the center of the bottom of a box-shaped case, and a substantially V-shaped case whose approximately central portion is swingably supported by the central terminal portion. A movable contact part having a switching contact part formed at one end thereof and a energizing contact part formed at the other end; A seesaw switch is equipped with a fixed contact part on which a switching contact part is formed, and a fixed contact part on which a current-carrying contact part is formed. The contact structure of the seesaw switch is characterized by the use of materials plated with precious metals.