JPS5818814A - Switch mechanism - 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 switch mechanism.

When a contact moves from on to off or from off to on in a conventional switch mechanism, it passes through a so-called dead band where the contact pressure becomes zero. At this time, if an external force such as vibration is applied, chattering tubes are likely to occur, which has the drawback of causing the electronic circuit to malfunction.

The present invention eliminates the above-mentioned drawbacks of the conventional switch, and maintains a sufficient contact pressure at all times when the switch is on, and instantaneously separates when the switch is turned off, thereby eliminating chattering. N is provided.

An embodiment of the present invention will be described.

In the figure, 1 is a compression spring, one end 11L of which is connected to the tip 2aK of the switch lever 2, which is an operating member, and the other end 1b is connected to the tip 3a of the main switching contact piece 3.
It is connected to and held in a compressed state. In this example, the switch lever 2 can swing freely around the other end 2bt, and can be pressed against the one end 1a'l of the compression spring 1 by receiving the pressure tube from the suppressing part @4 that is in contact with the rear. Ru. FIG. 1 shows a state in which the suppressing member 4 has retreated and is not pressing one end portion 1a of the compression spring, which contains water. Behind the switching main contact piece 5 I
/c is where the reverse switching contact piece 5 is located, and the tip 5a is separated by a predetermined distance from the tip 3a of the main switching contact piece. The switching main contact piece 3 and the switching reverse contact piece 5 are connected to the base portions 3b and 5b.
The movable contact piece is connected by spot welding 6 or the like, and is connected to a predetermined circuit pattern on the circuit board 7. When the switching main contact piece 3 and the switching reverse contact piece 5 are brought into contact with each other at the base of the pipe as shown in the figure, the switching reverse contact piece 5 is provided with a bent portion 8 near its base, and the switching main contact piece 5 is It is configured so that it can be moved away from the camera easily. 9#'i is a fixed contact piece and is connected to a predetermined circuit pattern on the circuit board 7.

The fixed contact piece 9 is provided with a contact point that comes into contact with the movable contact piece 3.5 at the tip of the vertically bent portion as shown in the second and S diagrams. In other words, the front liquid $9 that the tip 5a of the switching main contact piece 3 can come into contact with
a @ 9a, and a rear contact 9b is formed projecting a predetermined distance from this front contact. The rear contact 9b protrudes through a through groove 5c formed in the main switching contact piece 3, and is in contact with the tip 5a of the reverse switching contact piece 5. 10#j degree setting pin. As shown in the drawing, an ohmic spring may be used with the left side open, or conversely, an ohmic spring may be used with the right side open, or a coil spring may be used in the compressed state. Further, the operating section @ is not limited to this example, and may be any device such as a push button or a slide button that can suppress or release one end of a compression spring.

Next, the operation will be explained. Switch lever 2' force 1
When the compression spring 1' is in the forward position as shown by the chain line in FIG. 1, a pressing force is applied to one end of the compression spring 1', and the other end is in the retracted position. The switching main contact piece S' and the switching reverse contact piece 5I are in the retracted position pressure in contact with the degree setting bottle 10, so the switching main contact piece and the front contact 9a and the switching reverse contact piece and the rear contact piece 9b are separated and the switch is in the OFF state. .

First, when turning on the switch sound, the pressing force on one end of the compression lever 1 by the suppressing member 4 and the switch lever 2 is released.Then, the main switching contact piece 3 and the reverse switching contact piece 5 The force instantly returns to the solid line position 1 in FIG. They come into contact with a predetermined contact pressure and the switch is turned on.

Next, when turning the switch sound off, press vcFi, press section @
When 1 is pressed to the right, the switch lever (-2 swings around the other end 2bt) and reaches the switch lever 2' indicated by the chain line IIK.One end 11 of the compression spring 1 is pressed by the switch lever. During the forward movement, the compression spring 1Fi is compressed once, and when it crosses the neutral point, the spring is instantaneously expanded and the other end 1b retreats, and at the same time the main switching contact piece 3 萍 moves back.This process will be described in more detail. Until the compression spring 1 is compressed and reaches the neutral point, the skin contact pressure between the switching main contact piece 5 and the front contact 9a gradually decreases, and becomes almost zero at the neutral point. Reverse contact piece 5 and ridge contact 9
Since there is no influence on the contact pressure with b, the necessary and sufficient contact pressure is maintained, and the switch maintains a stable on state. The moment the compression spring 1 exceeds the neutral point, the spring expands and instantly separates the switching main contact piece 5 from the front contact 9a. A little later than this, the switching main contact piece 5! Move back by a predetermined distance and switch follower piece 5! At the same time as /c is brought into contact with each other, the reverse switching contact piece 5 follows the retreat of the main switching contact piece 3, and comes into contact with the counterfeit determination bit/10 and stops the retraction. In this way, when the reverse switching contact piece 5 separates from the rear contact 9b, it is instantaneous, and therefore the switch is immediately turned off without an unstable on state.

The reason why the bent portion 8 is provided when the base portions 3b and 5b are brought into contact with each other is to prevent the reverse switching contact piece from immediately following the initial movement of the main switching contact piece 5 in its retreat in the above-mentioned operation.

As described above, according to the present invention, it is possible to completely eliminate an unstable state when a switch is switched from on to off, and therefore chattering can be eliminated, and malfunctions can be prevented from occurring in the electronic circuit including this switch. It has extremely excellent effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view, FIG.
The figure is an enlarged cross-sectional view of the main part along the line 1-1 in FIG. 1... Compression spring 1a... One end of compression spring 1b.
...Other end of compression spring 3...Switching main contact piece 3a...
Tip of switching main contact piece 3b...Base of switching main contact piece 5
...Switching slave piece 5'a...Tip of switching slave piece
51:1...Base of switching subordinate piece 8...Bending part 9.
...Fixed contact plate 9a...Front contact 9b...Rear °
Contact point L...a specified distance or more Patent applicant Seikosha Co., Ltd. Representative Patent attorney Tsutomu Mogami Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) A movably supported operating member; a compression spring whose one end is supported by the operating member and which can be instantly retracted by the pressing force of the operating member; and the other end of the compression spring. A movable contact piece consisting of a main switching contact piece whose tip is connected to the main switching contact piece and can move forward and backward instantaneously, and a subordinate switching contact piece that follows the retreat of the main switching contact piece with a slight delay; (a front contact that the tip of the switching main contact piece can come into contact with)
A switch mechanism characterized by comprising a fixed contact plate and a tube fitting with a rear contact located at a position where the tip of the switching slave piece can still be contacted and protrudes a predetermined distance from the front contact. (2. In claim 1, the switching main contact piece and the switching slave contact piece are fixedly connected to each other at their bases, and the switching slave piece is connected to the switching main contact piece by a bent part provided near the base. A switch mechanism whose special purpose is to be far away from the contact piece.