JPH0620556A - Switch - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a switch used for an operation part of various devices, which has a long stroke, has a good feel during operation, has excellent heat resistance, and is easy to install. It is intended. A common terminal 1 having locking portions 1a and 1b and an individual terminal 3 are embedded in a terminal plate, an inner frame portion 4c and a tongue piece 4a are provided by a substantially square-shaped trimming, and a free end portion 4 of the tongue piece 4a is provided.
b and one end of the inner frame portion 4c are connected to the locking portions 1a and 1b of the common terminal 1.
A switching plate 4 that is swingably locked to the switching plate 4, a pressing portion 8 that presses near the other end of the switching plate 4, and a case 6 that accommodates the above members.
With this configuration, it is possible to provide a switch with a long stroke and a good feeling of operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch used for an operating section of various equipment.

[0002]

2. Description of the Related Art The configuration of various conventional switches will be described with reference to FIGS. 13 (a) to 13 (c).

The switch shown in FIG. 13A has a metal diaphragm 29 on the bottom surface of a case 24 having a fixed contact 28.
Insert the metal diaphragm 29 into the fixed contact 2
8 is pressed by a button 26 to perform a switching operation with a moderation feel. The switch shown in FIG. 13B is a movable contact 3 made of an elastomer or a rubber material on the bottom surface of a case 24a having a fixed contact 28a.
0a is inserted and fixed, and the movable contact 3 is pressed by the button 26a.
0 is pressed against the fixed contact 28 to perform the switching operation. In the switch shown in FIG. 13 (c), the metal pin 34b having a substantially U-shape forms the fulcrum portion 36b provided on the bottom surface of the case 24b. By pressing the coil spring 31b to the cam portion 35b of the operation portion as the center of attraction, the cam lever 35b is pressed to move the operation lever 26b.

[0004]

However, in the above-mentioned conventional configuration, when the stroke of the switch shown in FIG. 13 (a) is lengthened, the diaphragm depth of the metal diaphragm 29 is limited, and the stroke cannot be increased. There is a problem that the diameter of the diaphragm 29 needs to be increased and the life is shortened.

Further, in the switch shown in FIG. 13B, the rubber contact 30a is expensive, the feel during operation is poor, and the heat resistance is poor.

Although the switch shown in FIG. 13 (c) can obtain a long stroke, it has a large number of parts and a complicated structure, and the friction between the metal pin 34b and the cam 35b is utilized, so that the switch feels at the time of operation. It had a problem that it was bad and had a short life.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a switch having a long stroke, a good feel at the time of operation, excellent heat resistance, and easy installation.

[0008]

In order to solve the above-mentioned problems, a switch is trimmed into a substantially square shape, and at least pillars provided on a base body and having locking portions provided at vertically opposed positions. To form an inner frame part, and the tongue piece is projected inside the inner frame part, and the inner frame part of the switching plate is locked to one of the locking parts of the support pillars. The free end of the tongue piece is locked to the other end of the stop portion, and the pressing means is configured to press near the other end portion of the switching plate on the base side of the tongue piece.

[0009]

With the above construction, since the switching plate performs a swinging motion about the locking portion to which the inner frame is locked as the center of rotation, the switching plate has little change in stress due to elastic deformation of the tongue. A large amount of movement can be obtained near the other end portion according to the rotation angle, and a long stroke can be achieved.

[0010]

【Example】

(Embodiment 1) An embodiment of the switch of the present invention will be described below with reference to FIGS.

In the figure, reference numeral 7 is a terminal formed by embedding a common terminal 1 made of a conductor and recessed locking portions 1a, 1b at positions vertically opposed to each other and an individual terminal 3 made of a conductor. The plate 4 is provided with an inner frame portion 4c which is trimmed into a substantially rectangular shape, and a tongue piece 4a is provided inwardly of the inner frame portion 4c, and a free end portion 4b of the tongue piece 4a is provided.
Is a switching plate made of a conductor having a spring property and attached to the common terminal 1 by engaging the engaging portion 1b with one side of the inner frame portion 4c and engaging the engaging portion 1a. A pressing portion, which is provided on one end of the switching plate 4 and is made of an insulator that presses the movable contact 4f side, is a case 6 made of an insulator that houses these.

The operation of the switch configured as above will be described. First, the common terminal 1 having the locking portions 1a and 1b
And the tongue 4a having the free end 4b and one end of the inner frame portion 4c of the switching plate 4 which is locked to the common terminal 1 have the relationship of forces shown in FIG.

FIG. 3 shows a state in which a rotating force is generated in a direction in which the movable contact is separated from the fixed contact, F is a reaction force of the tongue piece, f is a rotating force, that is, a component force of F in the vertical direction of the frame, N
Is the component force of F in the direction parallel to the frame. As is apparent from FIG. 3, the switching plate is changed from the state shown in FIG.
When moved to the state shown in (b), the distance from the locking portion 1a to the base of the tongue piece is R ₀ = because the outer frame is a rigid body against tension.
R (R ₀ : distance from locking portion 1a before pressing to root of tongue, R: distance from locking portion 1a after pressing to root of tongue)
However, the distance from the locking portion 1b to the base of the tongue is r ₀ > r
(R ₀ : distance from the locking portion 1b before pressing to the base of the tongue,
r: Since the pressing after the locking portion 1b becomes distance) to the tongue root, the switching deflection only r ₀ -r is generated in the tongue 4a of-plate 4, the reaction force F of the thereby occurring tongue Under the influence of, the switching plate 4 generates a rotational force in the counterclockwise direction around the locking portion 1a. This becomes the rotational force f. When the angle formed by the reaction force F of the tongue piece 4a and the frame body is θ, the rotational force f can be expressed as f = F · sin θ from FIG.

5 (a) and 5 (b), the distance between the locking portions 1a and 1b when the switching plate 4 swings around the locking portion 1a as a rotation center is ε, and the locking is ε. Parts 1a, 1b
The angle formed by the switching plate with respect to the line connecting the lines is α ₀ , the angle formed by the switching plate with respect to the line connecting the locking parts 1a and 1b in the pressing process is α, and from the locking part 1b to the other end. When the rotational force f shown in FIG. 2 when the distance of r is set to r is described, the distance r from the locking portion 1b to the other end is (Equation 1),

[0015]

[Equation 1]

The deflection δ becomes (Equation 2).

[0017]

[Equation 2]

Further, according to the law of sine, sin θ = ε · sin α / r
Therefore, assuming that the spring constant of the tongue is k and the deflection is δ, F = k · δ and the rotational force f is f = (k · δ) · (ε ·
It can be expressed as sin α / r).

Here, as shown in FIG. 5B, the above θ becomes smaller as the other end is pushed down and the angle α becomes smaller, but the reaction force F of the tongue increases. Therefore,
The operating force is a combination of the curves of F and sin θ, and as shown in FIG. 6, the operating force becomes a curve protruding upward, and an operating force with a sense of moderation is generated.

(Embodiment 2) FIG. 7 shows another embodiment of the switch of the present invention, which has basically the same configuration as that of the embodiment shown in FIG. The detailed description will be omitted.

7 is different from the switch of the embodiment shown in FIG. 1 in that the common terminal 2 is provided with a tongue piece 2a, a free end portion 2b, and an inner frame portion 2c, and the switching plate 5 is shifted up and down to be engaged. 5
a, 5b and a movable contact piece 5c are provided, and the functions of the common terminal 1 and the switching plate 4 of the first embodiment are reversed. The switching plate may be a substantially U-shaped one having at least two oppositely arranged engaging portions as shown in FIG. 12B, and may be a conductor having elasticity such as beryllium copper, phosphor bronze, stainless steel or the like.

(Embodiment 3) FIG. 8 is also another embodiment of the switch of the present invention. Since the structure is basically the same as that of the embodiment shown in FIG. 1, the same parts are designated by the same reference numerals. 8, detailed description thereof will be omitted. In FIG. 8, the difference from the embodiment of FIG. 1 is that the outer frame portion 4d of the switching plate 4 is deflected together with the tongue piece 4a to cause bending in the pulling direction. is there. As described above, since the outer frame portion 4d of the switching plate 4 is flexibly connected to the tongue piece 4a of the switching plate 4 in series, the spring constant of the entire switching plate can be reduced, and the same operating force with the same size can be obtained. It has the advantage that the wear of the locking part has less effect on the flexure of each part when generating, and at the time of design, there is a margin in the tolerance of each part and the effect of deformation at the time of assembly can be reduced. Is.

As described above, the above switch is used in the first embodiment.
In addition to producing the same effect as in item (1), the service life is extended due to the reduced influence of wear of the locking portion, which is easy to assemble and rich in mass productivity.

(Embodiment 4) FIG. 9 is also another embodiment of the switch of the present invention. Since the structure is basically the same as that of the embodiment shown in FIG. 1, the same parts are designated by the same reference numerals. 9, detailed description will be omitted, and in FIG. 9, the point different from the embodiment of FIG. 1 is that, instead of the pillar provided in the common terminal 1, it is substantially U-shaped, for example, beryllium copper, phosphor bronze, stainless steel, etc. Having at least two locking portions 10a, 10
That is, the column 10 having b and made of a conductor is provided.

As described above, by manufacturing the column 10 with a plate material, it is possible to improve the productivity and the feeling of moderation.

In the first to fourth embodiments described above, by providing the contact piece 4g on the switching plate 4 as shown in FIG. 12 (a), contact wiping can be performed and reliability can be improved. Further, the common terminal may have a plurality of engaging portions arranged to face each other as shown in FIG.
Further, by integrating the terminal plate 7 and the case 6, the number of parts is reduced and the assembly is facilitated.

In the above embodiment, the switching plate 4 or 5 (however, the common terminal 2 in the embodiment of FIG. 7) is made of a spring material such as beryllium copper, phosphor bronze, stainless steel, etc. It is possible to provide a switch having excellent durability and durability.

[0028]

As described above, according to the present invention, at least the pillar provided on the base body, at least two engaging portions provided on the pillar, and the inner frame portion engaged with the engaging portion are provided. A switching plate, which is formed from one end and the other end by substantially R-shaped trimming and has a tongue that has a free end and is locked to the locking portion, and presses the other end of the switching plate near the other end. By providing such a pressing means, it is possible to realize a switch having a long stroke and a good operation feeling.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of a switch of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a relationship diagram showing a relationship between a force acting on a common terminal and a leaf spring, which is a main part of the same.

FIG. 4 (a) is a state diagram before pressing the common terminal and the leaf spring, which are the same main portions, and (b) is a state diagram after the pressing.

FIG. 5A is an operation principle diagram showing a state before the pressing. FIG. 5B is an operation principle diagram showing a state after the pressing.

FIG. 6 is a feeling curve diagram showing a state of the operation feeling.

FIG. 7 is an exploded perspective view of another embodiment of the switch of the present invention.

FIG. 8 is an exploded perspective view of the other embodiment.

FIG. 9 is a side sectional view of the other embodiment.

FIG. 10 is an exploded perspective view of the other embodiment.

FIG. 11 is a perspective view of a common terminal which is a main part of the other embodiment.

FIG. 12A is a perspective view of a switching plate that is a main part of the other embodiment. FIG. 12B is a perspective view of a switching plate that is a main part of the other embodiment.

13A to 13C are side sectional views of a conventional switch.

[Explanation of symbols]

 1 Common Terminal 1a, 1b, 5a, 5b Locking Part 2 Common Terminal 3 Individual Terminal 4, 5 Switching Plate 4a Tongue 4b Free End 4c Inner Frame 4g Contact Piece

Claims (4)

[Claims] 1. A support provided on at least a base body, each of which has a locking portion at a vertically offset position, and an inner frame portion formed by trimming into a substantially square shape, and a tongue is formed inside the inner frame portion. A switching plate having a protruding piece, and the inner frame portion of the switching plate locked to one of the locking portions of the column, and the free end of the tongue piece locked to the other locking portion. A switch configured to press the base side of the tongue piece of the switching plate. 2. An inner frame portion is formed by trimming into at least a substantially square shape, and a pillar provided on a base body in which a tongue piece is projected inside the inner frame portion and a pillar provided to be vertically offset from each other. A switching plate having a locking portion, one of the locking portions of the switching plate to lock the inner frame portion of the column, and the other of the locking portions to lock the free end of the tongue. A switch configured to press the switching plate. 3. The switch according to claim 1, wherein the engaging portion is provided on the column having elasticity. 4. The switch according to claim 2, wherein the engaging portion is provided on the switching plate having elasticity.