JPH08111138A - Switch - Google Patents

Abstract

PURPOSE: To provide a switch with simple constitution by which an ON position can be accurately set and proper contact point pressure can be secured in an ON condition and whose overstroke is enlarged. CONSTITUTION: A leaf spring 7 having a fixed contact point part 16 on one end and a movable contact point part 17 on the other end is installed in an almost rectangular solid case 2 in which terminals 8 having contact parts 8a and 8b are integrally molded. At the same time, the fixed contact point part 16 is brought into contact with one terminal 8, and the movable contact point part 17 is driven by a cam formed on lever 5, and this movable contact point part 17 is brought into contact with the other terminal 8, and the mutual respective terminals 8 are put in an electrically continuous condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch used in various electronic devices.

[0002]

2. Description of the Related Art A switch using a torsion coil spring as a movable contact is used as a switch for various electronic devices.
It is disclosed in Japanese Utility Model Publication No. 3-124435.

13 to 15 are operation state diagrams of the switch disclosed in the above publication, FIG. 13 shows a state (free position) before the switch operation, and the switch 100 is the fixed end 102 of the torsion coil spring 101. The fixed contact portion 103 is in contact with the contact portion 104 of the terminal (not shown), while the movable contact portion 106 of the movable end 105 is in contact with the torsion coil spring 101.
It is pushed up by the elastic force of and does not contact the contact portion 107.

FIG. 14 shows a state in which the lever 108 has started to be pushed (on position), and immediately after the movable contact portion 106 of the torsion coil spring 101 abuts on the contact portion 107 of the terminal.

FIG. 15 is a state in which the lever is further pushed from the state of FIG. 14 (overstroke), and the movable contact portion 106 of the torsion coil spring 101 slides to the left while being in contact with the contact portion 107. When the lever 108 is released, the switch 100 turns the torsion coil spring 101.
The elastic force of returns to the state of FIG.

[0006]

By the way, since the conventional switch uses a torsion coil spring as a contact, the ON position of the switch depends on the processing accuracy of the torsion coil spring. However, it is difficult to machine torsion coil springs with a certain degree of accuracy, and when using torsion coil springs with different machining accuracies, the position of the contact between the movable contact part of the torsion coil spring and the contact part of the terminal changes in the switch. As a result, the ON position is not constant and the accuracy is low. Further, in the overstroke state in which the lever is further pushed from the on state as shown in FIG. 15, the contact pressure increases in proportion to the pushing of the lever, so that there is a problem that there is a restriction in the use stroke. .

The present invention has been made in order to solve such a problem, and its purpose is to set an ON position with high accuracy and, in the ON state, to secure an appropriate contact pressure and to prevent overstroke. It is to provide a large switch with a simple configuration.

[0008]

In order to solve the above-mentioned problems, a switch according to the present invention comprises a spring made of a conductive material as a leaf spring, and the leaf spring is provided at a turning position of a cam formed on a lever. Together, they are turned on and off.

Further, in the switch according to the present invention, the cam has a fan shape, and when the cam is rotated around its center, the movable contact portion is turned on / off by the arc-shaped portion of the cam.

[0010]

In the switch according to the present invention, the fixed contact portion is brought into contact with the contact portion of one terminal and the movable contact portion is driven from the off state in which the movable contact portion is not in contact with the contact portion to rotate the cam by rotating the lever. The movable contact portion of the leaf spring is brought into contact with the contact portion of the other terminal to turn it on. When the lever is further pushed in, the lever bends the long piece of the leaf spring with the cam while keeping the movable contact portion in contact with the contact portion of the other terminal, and rotates to the full stroke.

Further, in the switch according to the present invention, since the cam for driving the movable contact portion has a fan shape, even when the lever is driven and the cam is rotated to the full stroke after being turned on, the cam is rotated. The contact pressure with respect to the stroke hardly changes.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an external perspective view of a switch according to the present invention,
2 is a sectional view taken along the line AA of FIG. 3, FIG. 3 is an exploded perspective view of the same, FIG. 4 is a right side view of the lever, FIG. 5 is a left side view of the same, and FIG.
7 is a plan view of the leaf spring, and FIG. 8 is a side view of the leaf spring. The switch 1 includes a case 2, a cover 3, a lever 5 having a tip protruding from an opening 4 of the cover 3, a spring 6, a leaf spring 7, and a terminal 8 fixed to the case 2.

The case 2 has a box shape of a substantially rectangular parallelepiped shape,
The contact portions 8a and 8b are integrally formed, and the two partition walls 2
It is divided into three chambers 2A, 2B, and 2C by a and 2b. A cover 5 is integrally formed with a lever 5, one end of which is a case 2 and a mounting leg 9 to a printed circuit board or the like. A leaf spring 7 to be sandwiched and a spring 6 are provided. Although not shown, the terminal 8
For example, any one of them is directly connected to the contact portion 8b, and the remaining terminals 8 are connected to the contact portion 8a.

As shown in FIGS. 4 and 5, the lever 5 has two
The upper fan-shaped portion 5 which is formed by integrally molding the two fan-shaped portions 5a and 5b with resin and projects from the opening 4 of the cover 3
The radius of a is formed larger than the radius of the lower fan-shaped portion 5b,
An extension portion 10 extending in the horizontal direction is formed at the boundary between the fan-shaped portions 5a and 5b.

The lower fan-shaped portion 5b functions as a cam, and its radius is made slightly smaller than the inner height of the case 2, and the arc-shaped portion 5c is formed in order to increase the contact area with the lever 5. Is formed so as to be widened by projecting from the right side surface. Both fan-shaped parts 5 are provided on the left side surface of the fan-shaped part 5b.
An edge portion 11 is formed at a boundary portion between a and 5b, and a convex portion 12 is formed at an end portion. Further, on the left side surface, a guide portion 13 extending from the convex portion 12 to a lower position than the convex portion 12 and extending in an arc is formed. Further, as shown in FIG. 6, the lever 5 is further provided with a swing shaft 14 extending in the horizontal direction at both ends of the main parts of both fan-shaped portions, and the swing shaft 14 is a recess formed in the case 2 and the partition walls 2a, 2b. It is inserted in 15. The swing shaft 1
The left side surface of 4 is formed long so as to fit the coil portion 6a of the spring 6 therein.

As shown in FIGS. 7 and 8, the leaf spring 7 is formed of a press product in a bifurcated shape, one of which is short, and includes a short piece portion 7a bent downward and a long piece portion 7b extending in the horizontal direction. The portion 7a has a fixed contact portion 16 formed by, for example, a square bead, and the long piece portion 7b has a bifurcated shape, and has a movable contact portion 17 formed by, for example, a square bead at each tip.

In the spring 6, the coil portion 6a is fitted on the swing shaft 14 of the lever 5, one free end of which is brought into contact with the convex portion 11a of the edge portion 11 and the other free end thereof is attached to the bottom of the case. It is in contact with the formed convex portion 18. The cover 3 is fitted to the case 2 with the lever 5, the leaf spring 7 and the spring 6 mounted in the case 2 (chambers 2A to 2C) and the fixed contact portion 16 and the contact portion 8b being in contact with each other. A lever 5 is configured to swing in and out through an opening 4 of the hole 3. At this time, the extending portion 10 extending in the radial direction is covered by the cover 3
The cam (fan-shaped portion 5
The upward rotation of b) is restricted.

FIGS. 9 to 12 are operation state diagrams of the switch having the above-mentioned structure, and the operation of the lever in each chamber is the same, so the operation in one chamber will be described below. FIG.
Indicates the state before the switch operation (free position), and the leaf spring 7
While the fixed contact portion 16 of the short piece portion 7a of the above is constantly in contact with the contact portion 8a of the terminal 8, the movable contact portion 17 pushes the lever 5 upward by the elastic action of the spring 6, and the contact portion It is not in contact with 8b.

FIG. 10 shows a state in which the lever 5 starts to be pushed against the spring 6 (on position), and the arcuate portion 5c of the lever 5 pushes the long piece portion 7b of the leaf spring 7 to move the movable contact portion 1 thereof.
The figure shows the state immediately after 7 is brought into contact with the contact portion 8b of the terminal 8.

FIG. 11 shows a state in which the lever 5 is further pushed (over stroke), and the lever 5 has its arcuate portion 5 while the movable contact portion 17 is in contact with the contact portion 8b of the terminal 8.
At c, the long piece 7b of the leaf spring 7 is rotated while being bent downward.

FIG. 12 shows a state in which the lever 5 is further pushed to the full extent (full stroke). Even though the lever 5 is pushed to the full extent, the swing shaft 14 and the leaf spring 7 are pushed.
Since the distance up to does not change, the bending of the long piece portion 7b of the leaf spring 7 by the arcuate portion 5c of the lever 5 hardly changes. When the pushing of the lever 5 is released from this state, the lever 5 is pushed back by the elastic force of the spring 6 and the switch 1 returns to the state of FIG.

[0022]

As described above, in the switch according to the first aspect of the present invention, the spring made of a conductive material is composed of a leaf spring, and the leaf spring is driven by a cam formed in a lever, so that the fixed contact is formed. Part comes into contact with the contact part of one terminal and the movable contact part is not in contact with the contact part.When the lever is driven to rotate the cam from the off state, the movable contact part of the leaf spring comes into contact with the other terminal. It is brought into contact with the section and turned on. When the lever is further pushed in, the lever bends the long piece of the leaf spring with the cam while keeping the movable contact portion in contact with the contact portion of the other terminal, and rotates to the full stroke. On this occasion,
Since the leaf spring that can be configured as a pressed product and the lever that can be configured as a resin molded product are used, a stable ON position can be obtained due to their good processing accuracy.

In the switch according to the second aspect of the present invention, the cam is fan-shaped, and when the cam is rotated around its center, the movable contact portion is driven by the arc-shaped portion of the cam. , The contact pressure with respect to the stroke hardly changes even when the lever is driven to rotate the cam to the full stroke. Therefore, a large overstroke can be taken and an appropriate contact pressure can be obtained in the ON region.

[Brief description of drawings]

FIG. 1 is an external perspective view of a switch according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an exploded perspective view of a switch according to the present invention.

FIG. 4 is a right side view of a lever constituting a switch according to the present invention.

FIG. 5 is a left side view of a lever constituting a switch according to the present invention.

6 is a sectional view taken along the line BB of FIG.

FIG. 7 is a plan view of a leaf spring that constitutes a switch according to the present invention.

FIG. 8 is a side view of a leaf spring that constitutes a switch according to the present invention.

FIG. 9 is an operation state diagram showing a state before a switch operation (free position).

FIG. 10 is an operation state diagram showing a state where the lever starts to be pushed against the spring (on position).

FIG. 11 is an operation state diagram showing a state in which the lever is further pushed in from the ON state (overstroke).

FIG. 12 is an operation state diagram showing a state in which the lever is fully pushed (full stroke).

FIG. 13 is an operation state diagram showing a state (free position) before the operation of the conventional switch.

FIG. 14 is an operation state diagram showing a state (ON position) in which a lever of a conventional switch is started to be pushed.

FIG. 15 is an operation state diagram showing a state (overstroke) in which the lever is further pushed from the state of FIG. 14 in the conventional switch.

[Explanation of symbols]

1 ... switch, 2 ... case, 2a, 2b ... partition wall, 2A,
2B, 2C ... Chamber, 3 ... Cover, 3a ... Horizontal part, 4 ... Opening, 5 ... Lever, 5a, 5b ... Fan-shaped part, 5c ... Arc-shaped part,
6 ... Spring, 6a ... Coil part, 7 ... Leaf spring, 7a ...
Short piece portion, 7b ... Long piece portion, 8 ... Terminal, 8a, 8b ... Contact portion, 9 ... Pin gate, 10 ... Extension portion, 11 ... Edge portion, 11
a ... convex portion, 12 ... convex portion, 13 ... guide portion, 14 ... swing shaft, 15 ... concave portion, 16 ... fixed contact portion, 17 ... movable contact portion, 18 ... convex portion.

Claims (2)

[Claims] 1. A spring made of a conductive material having a fixed contact portion at one end and a movable contact portion at the other end is mounted in a case having a terminal, and the fixed contact portion contacts one of the terminals. In the switch for bringing the movable contact portion into contact with the other terminal by driving the lever to bring the terminals into a conductive state, the spring is constituted by a leaf spring, and the leaf spring is used for the lever. A switch which is turned on / off in accordance with the rotational position of the cam formed in the above. 2. The switch according to claim 1, wherein the cam is fan-shaped, and when the cam is rotated about its center, the movable contact portion is turned on / off by the arc-shaped portion of the cam. Switch characterized by.