JPH0451400Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a rotary switch used in a power switch or the like having a relatively large current capacity.

[Conventional technology]

Figures 5 to 10 are explanatory diagrams of a conventional switch published in Utility Model Publication No. 60-35149, where Figure 5A is a plan view of the switch, Figure 5B is a side view of the switch, and Figure 6 is an insulation FIG. 7 is a plan view of the movable contact piece, FIG. 8 is a side view of the main parts of the drive body and insulated shaft, FIGS. It is a characteristic diagram of the bounce phenomenon when ON.

In FIG. 5, reference numeral 1 denotes an insulating case of a switch having a hole 1a in the center, and the open end side of the case 1 is held on an insulating substrate 2. 3 and 4 are terminals arranged on the left and right sides of the insulating board 2, with eyelets 3b and 4b.
It is fixed to the substrate 2 by the bent pieces 3d and 4d. The terminal 3 is provided with a protruding contact portion 3c bent perpendicularly to the plate surface of the substrate 2, and the terminal 4 is similarly formed with a contact portion 4c. 7 is a movable contact piece made of one metal plate, a hole 7b is formed in the center of the movable contact piece, and the circumference of this hole 7b is an annular part 7a;
A pair of opposing contact portions 7g and 7g' are formed on both sides of the annular portion 7a. 7 and 9, reference numeral 8 denotes a wire spring that causes the movable contact piece 7 to perform a snap action. One end of the spring 8 is inserted into the through hole 7e provided in the movable contact piece 7, and then the spring 8 is inserted into the through hole 7e provided in the movable contact piece 7. Square hole 2
It is locked on b. 9 is made of insulating material and shaft 10
A drive body that fits into the drive body 9 by the shaft 10.
is designed to be able to rotate. 5 is a metal cam support shaft, 6 is an insulating cam, and a pair of jetties 6d, 6
d is formed, and one end of the wire spring 8 is locked to the bottom 6e between the two jetties 6d.

Then, the movable contact piece 7 is placed on the terminal 4 of the insulating substrate 2.
and the insulating cam 6 are superposed on each other by the support shaft 5, and are rotatably attached to the insulating substrate 2, so that the movable contact piece 7 is electrically connected to the terminal 4.

Note that a protrusion 9g provided on the drive body 9 is positioned at the bottom 6e of the insulating cam 6 between the jetties 6d, 6d. FIG. 9A shows a state in which the shaft 10 fitted into the drive body 9 is rotated clockwise, the cam 6 is tilted to the left, and one of the protrusions 6d of the cam 6 is attached to the contact portion 4c of the terminal 4. It is stopped by contacting with. In this case, one contact portion 7g of the movable contact piece 7 comes into contact with the contact portion 3c of the terminal 3 due to the spring 8, and both terminals 3 and 4 are electrically short-circuited.

When the shaft 10 is turned counterclockwise from this state, the cam 6 is rotated to the right by the driver 9, and the cam 6
The other side of the jetty 6d contacts the corner of the contact portion 3c of the terminal 3, and the cam 6 is stopped at this position. On the other hand, the movable contact piece 7 is reversed by the spring 8, and one contact portion 7g is separated from the contact portion 3c of the terminal 3, and the electrical connection between the terminals 3 and 4 is turned off.

[Problem that the invention attempts to solve]

The conventional switch has the above-mentioned structure, but since the terminals 3 and 4 are made of thick metal plates and have rigidity, the movable contact piece 7 does not move when the wire spring 8 is reversed. When the contact portion 7g of the movable contact piece 7 comes into contact with the contact portion 3c of the terminal 3 due to the snap action, the shock cannot be absorbed, and therefore a bounce phenomenon occurs as shown in Fig. 10, resulting in a flying arc. It was hot.

The present invention attempts to eliminate the above-mentioned drawbacks of the conventional example, and an object of the present invention is to provide a rotary switch in which the arc does not fly when switching the contacts.

[Means for solving problems]

In order to achieve the above objects, the present invention provides a pair of terminals on an insulating substrate held at the open end of a case, and a movable contact piece and an insulating cam are rotatably attached to the insulating substrate by a cam support shaft. Further, in the rotary switch in which a wire spring for reversal is stretched between the movable contact piece and the insulating cam, the terminal that controls switching of the contact is made of an elastic thin metal plate, and the terminal is made of an elastic thin metal plate, and the terminal is made of a thin metal plate having elasticity. It has a configuration in which a hole is provided in which the end of the terminal fits loosely, and the end of the terminal is brought into elastic contact with one wall surface of the hole.

[Effect]

According to the embodiment of the present invention as described above, the terminal is made of an elastic thin metal plate, the contact portion of the terminal is in elastic contact with the upper wall surface of the hole in the case, and the snap action caused by the reversal of the wire spring When the contact part of the movable contact piece comes into contact with the contact part of the terminal, the contact part of the terminal bends within the hole of the case and is supported by the wall below the hole of the case, so when switching the contact The resulting impact is absorbed, so that the bounce phenomenon that occurs in the prior art does not occur and no arc occurs.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a plan view of the switch of the present invention, Fig. 2 is a plan view with the case shown in Fig. 1 removed, and Fig. 3 is an explanatory diagram of the switching operation between the contact part of the movable contact piece and the contact part of the terminal. , FIG. 4 is a characteristic diagram showing the contact state when the contact is ON.

Note that the same parts as in the conventional example shown in FIGS. 5 to 10 are given the same reference numerals, and redundant explanation will be omitted.

The difference between the present invention and the conventional example lies in the structure of the terminal, and this point will be explained in detail below.

In Figs. 2 and 3, the terminals 3 and 4 are made of elastic thin metal plates, and the case 1 is provided with holes 15 and 16 for fitting the contact portions 3c and 4c of the terminals 3 and 4, so that the contacts are turned OFF. In this state, as shown by the dotted line in FIG.
The contact portion 7g is in elastic contact with the upper wall surface of the hole 15.
does not press the contact portion 3c of the terminal 3. When the contact turns ON from this state as shown in Figure 2,
On the way, the bent contact part 7g of the movable contact piece 7 comes into contact with the contact part 3c of the terminal 3, and as shown by the solid line in FIG. Press downward against contact part 3c.
bends downward, and finally the contact portion 7c of the movable contact piece 7
While being pressed, it is supported by the lower wall surface of the hole 15 of the case 1, stops at that position, and the contact becomes ON.

Further, when the contact is switched to the OFF state, the pressure of the contact portion 7g of the movable contact piece 7 to the contact portion 3c of the terminal 3 is released, and the contact portion 7g of the movable contact piece 7 is
The contact portion 3c of the terminal 3 returns upward due to its own elasticity and comes into elastic contact with the upper wall of the hole 15 as shown by the dotted line in FIG. 3.

According to the embodiment of the present invention, the contact portion 3c of the terminal 3
is made of an elastic thin metal plate, and when the contact is turned on, that is, when the contact portion 7g of the movable contact piece 7 comes into contact with the contact portion 3c of the terminal 3 and presses it downward, the contact portion 3c
Since it has elasticity, it bends downward, and finally, when it is pressed against the contact part 7g, the hole 15
It is supported by the lower wall of the Therefore, the shock at the time of contact is absorbed, so that no bounce phenomenon occurs as shown in FIG. 4, and no arc jumps when the contact is turned on.
In the above embodiment, both the terminals 3 and 4 are made of elastic thin metal plates, but the invention is not limited to this.
Only the terminal 3 that controls this may be made of a thin metal plate.

[Effect of idea]

According to the present invention, when the contact is turned on, the contact part of the terminal is bent, so the shock when the contact part of the movable contact piece and the contact part of the terminal come into contact is absorbed, and the bounce phenomenon does not occur. There isn't. Therefore, the contact is ON
This has the effect that no arc occurs when

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention.
The figure is a plan view of the switch, Fig. 2 is a plan view with the case shown in Fig. 1 removed, Fig. 3 is an explanatory diagram of switching operation between the contact part of the movable contact piece and the contact part of the terminal, and Fig. 4 is a characteristic diagram showing the contact state when the contact is ON, FIGS. 5 to 10 are explanatory diagrams of the conventional example, FIG. 5 A is a plan view of the switch, FIG. 5 B is a side view of the switch, and FIG. FIG. 7 is a plan view of the insulating substrate, and FIG. 8 is a plan view of the movable contact piece.
The figure is a side view of the main parts of the drive body and insulated shaft, Figure 9A,
Figure 10 shows the contact points.
FIG. 3 is a characteristic diagram showing a bounce phenomenon when ON. 1... Insulating case, 2... Insulating board, 3, 4...
...Terminal, 3c, 4c...Contact part, 5...Cam support shaft, 6...Insulating cam, 7...Movable contact piece, 7g, 7
g'...Contact part, 8...Wire spring, 15, 16...
Hole.

Claims (1)

[Scope of utility model registration request] A pair of terminals are provided on an insulating board held on the open end side of the case, a movable contact piece and an insulating cam are rotatably attached to the insulating board by a cam support shaft, and a pair of terminals is provided between the movable contact piece and the insulating cam. In a rotary switch in which a spring for reversing is stretched between the terminal and the terminal, the terminal which controls the switching of the contact is made of an elastic thin metal plate, and a hole is formed in the case in which the end of the contact part of the terminal fits loosely. 1. A rotary switch, characterized in that the end of the contact portion is brought into elastic contact with the wall surface of the hole.