JPH0421222Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a contact structure of a switch.

[Conventional technology]

Figures 6 to 8 A, B, and C are explanatory diagrams of the conventional example; Figure 6 is a sectional view of the lever switch; Figures 7 A, B, and C are explanatory diagrams of the switching type contact switching operation; Figures 8A, 8B, and 8C are explanatory diagrams of the non-shooting type contact switching operation.

In FIG. 6, 21 is a frame body, 22 and 23 are fixed contact pieces fixedly planted on the bottom surface of the frame body 21, 24 is a movable contact piece disposed between both fixed contact pieces 22 and 23, and 25
A lever is rotatably supported in the vertical direction by a shaft 26 on the frame 21, and the end of the movable contact piece 24 is engaged with the tip of the lever 25.

The lever 25 of the lever switch as described above is biased upward by a spring (not shown), and in the non-operating state, the contact 24a of the movable contact piece 24 is connected to the lower fixed contact piece 23 as shown in FIG. 7A. Fixed contact 23
It is in elastic contact with a. In this state, when the end of the lever 25 is pressed downward against the elasticity of the spring, the state shown in FIG. After a state of simultaneous contact, the contact 24a of the movable contact piece 24 is switched to a state of elastic contact with the contact 22a of the upper fixed contact piece 22, as shown in FIG. 7C. In this way, a switching type of contact is performed. When the lever 25 is no longer pressed, the state shown in FIG. 7A is restored due to the elasticity of the return spring.

In addition, in order to perform non-switching type contact switching, the upper and lower fixed contact pieces 22 and 23 are bent in the direction away from the movable contact piece 24, that is, in the upward and downward directions, and are plastically deformed, so that the lever 25 is activated by the spring. When the contact point 24a of the movable contact piece 24 and the lower fixed contact piece 23 are pressed upward, as shown in FIG.
The contacts 23a are in contact.

In this state, when the tip of the lever 25 is pressed downward, the state shown in FIG.
After passing through a state in which it does not contact contacts a and 23a, the contact 24a of the movable contact piece 24 changes to a state in which it comes into elastic contact with the contact 22a of the upper fixed contact piece 22, as shown in FIG. 8C.
In this way, non-shooting contact switching is performed.

Then, if you stop pressing the lever 25, the lever 2
5 returns to its original state as shown in FIG. 8A due to the elasticity of the return spring.

[Problem that the invention attempts to solve]

However, the above switch has the following problems.

(1) In order to bring the contact point 24a of the movable contact piece 24 into contact with the contact point 22a of the fixed contact piece 22, in addition to the elastic force of the return spring, a force that lifts the movable contact piece 24 upward against the elasticity acts. , the lever 24 requires a large actuation force.

(2) When switching the contacts of the non-shooting type, the contact 24a of the movable contact 24 and the fixed contact 2
In order to equalize the contact pressure between the contacts 22a and 23a, the fixed contact pieces 22 and 23 must be bent and plastically deformed in a direction away from the movable contact piece 24, compared to when switching contacts of the shooting type. Therefore, the amount of movement of the lever 25 must be increased by this distance. Therefore, in order to change the switch from a shooting type to a non-shooting type, the overall structure of the switch must be significantly changed.

The present invention is intended to eliminate the above-mentioned drawbacks of the conventional technology, and the purpose of the present invention is to reduce the operating force of the lever compared to the conventional technology, and to minimize changes in the shooting type and non-shooting type. The aim is to provide a switch contact structure that can be achieved with minimal design changes.

[Means for solving problems]

In order to achieve the above objects, the present invention includes first and second movable contact pieces arranged in the vertical direction, a common fixed terminal arranged in the vertical direction opposite to the movable contact pieces, It has a lever that is rotatable in the vertical direction and has a cam that can make sliding contact with the first and second movable contact pieces, and the lever is provided with a cam that can be slidably contacted with the first and second movable contact pieces. First and second contact portions are provided that make elastic contact, and when the lever is rotated in the vertical direction, the cam of the lever is brought into sliding contact with the movable contact piece, and the movable contact piece is moved in a direction away from the fixed terminal. It has a unique structure.

[Effect]

According to the present invention, the movable contact piece and the fixed contact piece
The operating force acting on the lever when switching between ON and OFF is
With the exception of the elasticity of the return spring of the lever, it is made up of only the sliding friction that acts between the cam provided on the lever and both movable contact pieces, so the actuation force of the lever is smaller than that of the conventional lever. It is possible to change between a shooting type and a non-shooting type by simply changing the design of the cam.

〔Example〕

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

Figures 1 to 4 are explanatory diagrams of embodiments of the present invention,
Figure 1 is an exploded perspective view of the switch, Figure 2 is a perspective view of the main parts for explaining the operation of the switch, Figure 3 is
B and C are diagrams explaining the contact switching operation of the non-shooting type, and FIGS.

In FIG. 1, 1 is a frame, 2 and 3 are elastic first and second movable contact pieces, 2a and 3a are contacts of the movable contact pieces 2 and 3, and the base is supported by a mounting part 4. The mounting portion 4 is vertically fixed to the bottom surface of the frame 1 by fitting into the hole 5 of the frame 1. 6 is a fixed terminal fixed to the bottom of the frame 1 in the vertical direction, facing the movable contact pieces 2 and 3;
6a and 6b are the contacts of the fixed terminal 6 which are provided opposite to the contacts 2a and 3a and can come into elastic contact with the contacts 2a and 3a, and as shown in FIG. , and the second
It constitutes the contact part B of. And movable contact piece 2,
3 and the fixed terminal 6 constitute one set of switch elements, and in the first embodiment, two such sets are provided. Reference numeral 9 denotes a lever, which is pivotally supported by the frame 1 so as to be rotatable in the vertical direction.
A cam 10 is provided which slides into contact with the movable contact pieces 2 and 3 during rotation and controls switching of the contacts. 11 is a cover that covers the open surface of the frame 1.

When the lever 9 is in an unactuated state, it is urged upward by a spring (not shown), and in this state, the cam 10 comes into contact with the lower movable contact piece 3 as shown in FIG. is lifted, and the contact 3a of the movable contact piece 3 is connected to the lower contact 6b of the fixed terminal 6.
The cam 10 does not contact the upper movable contact piece 2, and the elasticity of the movable contact piece 2 itself maintains the ON state between the contacts 2a and 6a.

From this state, the lever 9 is moved against the elasticity of the return spring.
When the cam 1 is pressed downward, the cam 1 is pressed down as shown in Fig. 3 (b).
0 slips out of the movable contact piece 3 and is located between the movable contact pieces 2 and 3, the contact 3a of the movable contact piece 3 and the fixed terminal 6
The contact 6b of the movable contact piece 2 and the contact 6a of the fixed terminal 6 are turned on at the same time.

When pressing the lever 9 further downward from this state, the cam 10 of the lever 9 comes into contact with the upper movable contact piece 2, the movable contact piece 2 is lifted, and the contact 2a of the movable contact piece 2 and the fixed terminal 6 upper contact point 6a
is turned OFF, while the contact 3a of the movable contact piece 3 and the lower contact 6b of the fixed terminal 6 are turned ON.

In this way, the switching of the shooting type is performed.

Also, if you want to make it a non-shooting type,
As shown in FIG.
All you have to do is set it up.

In this case, when the lever 10 is not activated, the lever 10 is in contact with the lower movable contact piece 3, as shown in FIG. 6b is in the OFF state, while
The cam 10 does not come into contact with the upper movable contact piece 2, and the elasticity of the movable contact piece 2 itself keeps the contacts 2a and 6a ON.
The condition is maintained.

From this state, the lever 9 is moved against the elasticity of the return spring.
When the cam 1 is pressed upward, the cam 1 is pressed upward as shown in Fig. 4B.
0 simultaneously contacts the upper movable contact piece 2 and the lower movable contact piece 3, the contact 2a of the upper movable contact piece 2 and the upper contact 6a of the fixed terminal 6 are turned OFF, and at the same time the lower movable contact piece 3 The contact 3a and the lower contact 6b of the fixed terminal 6 are turned OFF.

When pressing the lever 9 further downward from this state, the cam 10 of the lever 9 comes into contact with the upper movable contact piece 2, and the contact 2a of the movable contact piece 2 and the upper contact 6a of the fixed terminal 6 are turned OFF. , the contact 3a of the movable contact piece 3 and the contact 6b of the fixed terminal 6 are turned on.

In this way, a non-shooting type of contact switching is performed.

According to the above embodiment of the present invention, the following effects are obtained.

(1) The operating force acting on the lever 9 when switching the contact between ON and OFF is due to the cam 10 provided on the lever 9 and the movable contact pieces 2 and 3, excluding the elastic force of the return spring of the lever 9.
It is established only from the sliding friction that acts between the
The actuation force of the lever 9 is lighter than before.

(2) By simply changing the shape of the cam 10 provided on the lever 9, the timing of contact between the movable contact pieces 2, 3 and the fixed terminal 6 can be set to the desired timing, allowing for shooting type and non-shooting type. Changes are possible.

In the above embodiment, the cam 10 was changed into a shooting type and a non-shooting type by changing the shape of the cam 10.
The shape of the movable contact pieces 2 and 3 may not be changed, but the distance between the movable contact pieces 2 and 3 may be changed as appropriate.
This is also possible by shifting the positions of the contact portions A and B with respect to the sliding trajectory on which they slide.

5A and 5B are perspective views of essential parts for explaining the operation of a switch according to another embodiment of the present invention, in which FIG. 5A shows the lever in an unpressed state, and FIG. 5B shows the lever in a pressed state.

In this embodiment, the contacts 3a and 6b are in the state shown in FIG.
However, at this time, the extension part 10b of the cam 10 made of an insulator intervenes between both contacts 3a and 6b, and in the state shown in FIG.
a becomes OFF, at which time the extension part 10 of the cam 10
b intervenes between both contacts 2a and 6a. By doing this, an insulator is interposed between both contacts when the contacts are in the OFF state, which also has the effect of increasing the withstand voltage.

[Effect of idea]

According to the present invention, the movable contact piece and the fixed contact piece
The operating force acting on the lever when switching between ON and OFF is
Except for the elasticity of the lever return spring, the lever is made up of only the sliding friction that acts between the cam provided on the lever and both movable contact pieces, so the actuation force of the lever is smaller than before, and it also requires only a small amount of force. Due to design changes,
It is possible to change between shooting type and non-shooting type.

[Brief explanation of drawings]

Figures 1 to 5 A and B are explanatory diagrams of an embodiment of the present invention, in which Figure 1 is an exploded perspective view of the switch, Figure 2 is a perspective view of essential parts for explaining the operation of the switch, and Figure 3 is an exploded perspective view of the switch.
Figures A, B, and C are explanatory diagrams of the contact switching operation of the shooting type, Figure 4 A, B, and C are explanatory diagrams of the contact switching operation of the non-shooting type, and Figure 5 A,
B is a perspective view for explaining the operation of the switch of another embodiment, FIGS. 6 to 8 A, B, and C are explanatory views of the conventional example, FIG. ，
B and C are diagrams for explaining the contact switching operation of the shooting type, and FIGS. 8A, 8B, and C are diagrams for explaining the contact switching operation of the non-shooting type. 1... Frame body, 2, 3... Movable contact piece, 2a, 3a
... Contact, 6 ... Fixed terminal, 6a, 6b ... Contact, 9 ... Lever, 10 ... Cam, 10a ... Plane part, 10b ... Extension part, A ... First contact part,
B...Second contact portion.

Claims (1)

[Scope of utility model registration request] first and second movable contact pieces arranged in the vertical direction;
a common fixed terminal arranged vertically opposite to these movable contact pieces, and a lever that is rotatable in the vertical direction and provided with a cam that can slide into contact with the first and second movable contact pieces. and providing first and second contact portions that come into elastic contact with each other between the first and second movable contact pieces and the fixed terminal,
A contact structure for a switch, characterized in that by vertically rotating the lever, a cam of the lever is brought into sliding contact with a movable contact piece, and the movable contact piece is moved in a direction away from a fixed terminal.