JPH1153974A - Switch mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch mechanism capable of making a switch small and having good assembling workability. SOLUTION: This switch mechanism consists of a pair of conductive supporting plates 2 standing on a base part 1 so as to face each other and at least whose one is connected to a common terminal 7, a U-shaped working body 3 pivoted on the supporting plates 2 in pivoting axes 30 at both ends, a U-shaped conductive switching body 4 arranged in a direction opposite to the working body 3 and pivoted on the supporting plates 2 in pivoting axes 40 at both ends, a coil spring 5 connecting the pivoting axes 30, 40 of the working body 3 and the switching body 4 to base sides 31, 41 on the opposite side, a locking body 22 for positioning the top of the working body 3 at the top of the pivoting axes 40 of the switching body 4, a locking connecting body 70 for connecting to a normally closed terminal 7 and for positioning the stationary state of the switching body 4, a contact connecting body 80 for connecting to a normally open terminal 8 in the position on the both sides of the switching body, between the locking connecting body 70 and the base part 1, and a working piece for making working body 3 move vertically. The pivoting axes 30 of the working body 3 are fixed to the lower parts of the pivoting axes 40 of the switching body 4 and arranged at the position, where the switching body 4 and the working body 3 cross.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch mechanism for a push button switch, and more particularly, to a switch mechanism which can improve workability and can be reduced in size.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a switch mechanism of a conventional push button switch. This switch mechanism
A normally-closed contact A and a normally-open contact B are provided to face each other, and a base end of a movable piece D provided with a movable contact C inserted between the contacts at the tip is inserted into a concave groove G on the front surface of the common terminal F. , One common terminal F
The base end of the operating body I is swingably inserted into the concave groove H on the back surface of the moving member D, and a coil spring E is provided between the movable piece D and the operating body I, and the coil spring E is pushed downward, whereby the operating body is In this mechanism, I is moved downward, the movable piece D is moved downward via the coil spring E, the contact is switched, and the electrical connection is moved from the normally closed terminal J to the normally open terminal K.

In the switch mechanism having such a structure, when the switch is to be miniaturized, the spring E is hooked while the movable piece D and the base of the operating body I are opposed to each other and inserted into the groove G or H of the common terminal F. Perform assembly. However, the assembly in which the spring E is hooked while inserting the movable piece D and the base end of the operating body I into the concave groove G or H of the common terminal F cannot be easily performed when a small switch mechanism is manufactured. . In other words, before assembly is complete,
When an impact is applied at the time of assembling or the like, each part is separated and may be detached. The service life of this type of switch mechanism is generally the same as the movable piece D or the operating body I.
Has a base end portion in contact with and supported in the concave groove portion of the common terminal F, the life is determined by the degree of wear of this portion, and the life is generally about one million times. .

[0004]

According to the present invention, the assembly of the movable piece and the coil spring is considered to be the most important part in simplifying the assembling operation when the size of the switch mechanism is reduced. In addition, the contact between the base of the movable piece and the groove of the common terminal becomes smaller as the contact area becomes smaller as compared with a normal one, but the force applied to the movable piece does not decrease in proportion to the size reduction. Therefore, the force applied to the base of the movable piece and the groove of the common terminal is expected to be relatively large, which may further shorten the switch life. Therefore, the present invention provides a switch mechanism that does not have a configuration in which the groove and the plate are in contact with each other, and that can be independently mounted when the coil spring is mounted, instead of being integrated with the position of the movable piece. This is necessary for miniaturization of the switch structure. In addition, it is necessary to have good performance against bouncing and chattering as in a normal switch mechanism.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a switch mechanism capable of reducing the size of a switch and having a good assembling work, and has the following features. ing. The invention according to claim 1 has the following features. That is, a pair of conductive support plates that stand upright on the base and connect at least one to the common terminal,
An actuating body formed in a U-shape on the support plate and pivotally supported by pivot shafts provided at both end portions, and arranged in the opposite direction to the operating body, formed in a U-shape on the support plate and provided at both end portions. A conductive switching body pivotally supported by a pivot shaft, a coil spring connecting between the operating body and each side of the switching body opposite to the pivot shaft, and an upper side above a plane connecting the switching body and the pivot portion. A locking body for positioning the upper portion of the action piece, a locking connection body connected to the normally closed terminal and positioning the switching body in a steady state, and a switching body between the locking connection body and the base. At the sandwiched position, it consists of a contact connecting body connected to the normally open terminal, and an operating piece that moves the operating body up and down,
The switch mechanism is characterized in that the mounting position of the pivot of the operating body is located below the pivot of the switching body, and is arranged at a position where the switching body and the operating body intersect.

[0006] The second aspect of the present invention is the first aspect of the present invention.
The switch mechanism has the following features in addition to the features of the invention described above. That is, the switching member is formed by bending a round bar into a U-shape.

[0007] The third aspect of the present invention is the first aspect of the present invention.
Alternatively, in addition to the features of the invention described in claim 2, the switch mechanism has the following features. In other words, the switching body on the side of the pivot portion from the position where the coil spring is attached is set at the contact position with the locking connection body and the contact connection body.

According to the first aspect of the present invention, each of the pivots of the base end portions of the U-shaped operating body and the U-shaped switching body arranged in the opposite direction is constructed as described above. The support shaft is pivotably supported on the support plate, and the operating body and the switching body are connected by a coil spring. Then, when the operating body is pushed toward the base side via the working piece, the operating body rotates downward while stretching the coil spring around the pivot shaft inserted into the pivot hole of the support plate, and also moves the switching body downward. Rotate. Since the contact connection body connected to the normally open terminal is located below the switching body, the switching body rotates until it comes into contact with the contact connection body. Therefore, the circuit is electrically switched from the common terminal-support plate-switching body-locking connection body-normally closed terminal circuit to the common terminal-supporting plate-switching body-contact connection body-normally open terminal circuit, and the switching is completed. I do.

Next, when the force applied to the acting piece is released, the operating body rotates upward about the pivot shaft by the elastic force of the coil spring. The operating body comes into contact with the locking body and stops rotating. At this time, with the rotation of the operating body, the elastic force of the coil spring also acts on the switching body, and the switching body rotates upward around the pivot shaft, and the switching body is connected to the normally closed terminal. Until it is locked by the locking connector.
Electrically, the common terminal-support plate-switching body-contact connection body-
The terminal is switched from the normally open terminal circuit to the common terminal, the support plate, the switching body, the locking connection body, and the normally closed terminal, so that the initial contact conduction state is established and the switching is completed.

Further, since the operating body and the switching body rotate through the pivot holes in the pivot holes of the support plate, wear is small, and the life of the switch mechanism can be extended.

Further, as in the second aspect of the present invention, the switching member is formed by bending a round bar made of a conductive metal wire material such as phosphor bronze for a spring having appropriate strength into a U-shape. It can also be formed by forming a body. In this case, the switching body can be easily manufactured at low cost. Since the switching body is made of a round bar, the switching body is securely connected at a point in the contact connection of the locking connection body or the contact connection body, thereby preventing malfunction or the like.

According to the third aspect of the present invention, the switching body on the side of the pivot portion from the side where the coil spring is mounted is located at the contact position with the locking connection body and the contact connection body. That is, since the point of action of the coil spring as an attachment position of the switching body is located earlier than the contact connection body, it works so as to reduce bouncing and chattering of the switch.

[0013] In the above invention, a switch mechanism for increasing at least the strength of the operating body may be adopted. For example, when only a high-strength material is used for the operating body, or when the same material is used, the thickness can be increased by increasing the thickness. In this case, even when the size of the switch mechanism is reduced in size, it is not necessary to strengthen the switching body 4 by maintaining only the strength of the operating body, which is a portion applied to the pressing force of the pressing piece. In addition, the size of the switch mechanism can be reduced and manufactured at low cost.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 are enlarged views of an example of the switch mechanism of the present invention. FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a side view, and FIG. is there. FIG. 5 is an explanatory diagram showing a switching operation state. The switch mechanism according to the present invention includes the base 1
An operating body 3 for performing a switching operation, a switching body 4 and a coil spring 5, a support plate 2 for supporting the operating body 3 and the switching body 4, a common terminal 6 switched by switching,
It comprises a normally closed terminal 7 and a normally open terminal 8.

The base 1 is made of an appropriate material such as an insulating material, and has terminal insertion holes 10, 11, and 12 for inserting the common terminal 6, the normally closed terminal 7, and the normally open terminal 8, as shown in FIG. In addition, convex portions 13 are provided at different positions on both sides of the base 1 so that the base 1 can be inserted into the switch housing 9 in an appropriate direction. In the figure, reference numeral 14 denotes a switch housing 9 (not shown) for fixing the base 1 to the switch housing 9.
Is a concave portion for engaging with the locking projection provided on the boss.

The upper portion of the common terminal 6 is formed in a U-shape, and the support plate 2 is erected at a position facing both ends formed in the U-shape. And
Insert the common terminal 6 into the terminal insertion hole 10 of the base 1,
The U-shaped portion of the common terminal 6 is mounted and fixed in the insertion hole 10. In the embodiment, the common terminal 6 and the support plate 2 are manufactured from the same material by punching and press working or the like, but only one of the support plates 2 is connected to the common terminal 6, and the other is not connected to the common terminal 6. It may be configured. In this case, support plate 2
It is needless to say that it is necessary to manufacture the actuator 3 and the switching body 4 to be described later completely from a material having sufficient strength.

A pivot hole 20 is provided in each of the opposing support plates 2 at a position slightly above the base 1, and a pivot hole 21 is provided further above the pivot hole 20. Then, the upper end of one support plate 2 is bent inward, and
2 are formed.

The normally closed terminal 7 has its upper part
The end on the side provided with is extended in an L-shape, and the base 1
In the terminal insertion hole 11 of FIG. An inverted L-shaped locking connector 70 is provided at the upper end of the L-shaped portion in the same direction as the locking body 22.

The upper end of the normally open terminal 8 has both ends slightly wider, and is mounted in the terminal insertion hole 12 of the base 1. Then, the upper end of the normally open terminal 8 opposite to the locking connection body 70 of the normally closed terminal 7 is extended upward, and the contact connection body 8
0 is provided. The contact connection body 80 is bent to a position substantially facing the locking connection body 70.

The working body 3 is formed by bending both ends of a base 31 of a round bar made of a conductive metal wire material such as stainless steel having appropriate strength in the same direction to form connecting sides 32 and 33. Then, the whole is formed into a U-shape, and the connection side 3
The distal end portions of 2, 33 are bent outward to form a pivot shaft 30. The pivot shaft 30 is inserted into the pivot hole 20 of the support plate 2, and the operating body 3 can swing about the pivot shaft 30. The portion a of the connection side 32 of the operating body 3 is
Can be locked on the lower surface of the locking body 22 when the rocker swings upward. The material of the operating body 3 is not limited as long as it has appropriate strength, and may not have conductivity.

The switching body 4 is made of a base 4 made of a round bar made of a conductive metal wire material such as phosphor bronze for a spring having appropriate strength.
1 are bent in the same direction to form connection sides 42 and 43. And the whole is made into a U-shape, and the connection side 4
The pivotal shafts 40 are formed by bending the distal end portions of 2 and 43 outward, and the pivotal shafts 40 are inserted into the pivotal holes 21 of the support plate 2. The mounting direction of the switching body 4 is swingably mounted at a position opposite to the operating body 3 on the side opposite to the mounting direction of the operating body 3. The portion b of the connection side 42 of the switching body 4 can be locked on the lower surface of the locking connection body 70 when the switching body 4 swings upward,
Can be in contact with the uppermost edge of the contact connector 80 when the switch 4 swings downward. The mounting position of the contact connecting body 80 is such that when the switching body 4 comes into contact with the contact connecting body 80, the plane formed by the switching body 4 and the pivot 40 is the locking body 22 (actually, the operating body). 3 is locked at a position below the portion locked by the locking body 22). In addition,
The material of the switching body 4 is not limited as long as it has conductivity and strength, and may be formed by punching a metal plate. Furthermore, in the present invention, the entire shape of the operating body 3 and the switching body 4 is formed in a U-shape. However, the operating body 3 and the switching body 4 may have a shape in which the center is cut off as a space in which the coil spring 5 described later can move. Needless to say, V-shaped, U-shaped, and M-shaped shapes that are appropriately modified are also included.

The present invention is constructed as described above. At the time of assembling, the operating body 3 and the switching body 4 are connected to the supporting plate 2 at predetermined pivot holes 20, 2 and
At the time of insertion into the unit 1, assembly can be performed using a jig (not shown). That is, when both ends of the U-shape of the operating body 3 and the switching body 4 are held in a collapsed state by using a spring property inside and are slid and inserted between the support plates 2 and the jig is pulled out, the operating body 3 The pivot shaft 30 and the pivot shaft 40 at each end of the switching body 4 are
Move outward and insert the pivot shafts 30 and 40 into the pivot holes 20 and 21 to complete the assembly.

The coil spring 5 is connected to the base 3 of the operating body 3.
1 and the base 41 of the switching body 4 are connected to each other.
A pulling force is applied between 1, 41, and the operating body 3 is
The switching bodies 4 are in a state of being locked to the locking connection bodies 70, respectively. In the drawing, reference numeral 90 denotes an operating piece that transmits the pressing force of the pressing piece provided on the switch housing 9 to the base 31 of the operating body 3 and pushes the base 31 downward.

The present invention is constructed as described above,
Before the force of 0 is applied, the operating body 3 is locked to the locking body 22 and the switching body 4 is locked to the locking connecting body 70 by the elastic force of the coil spring 5 ( FIG. 5 (a)). In this state, when the action piece 90 is pushed down, the operating body 3 swings downward about the pivot shaft 30. At this time, the base 31 of the operating body 3 rotates downward while the coil spring 5 is extended (FIG. 5).
(B)).

The center line of the coil spring 5 (FIG. 5B)
When the one-dot chain line is positioned below a plane (two-dot chain line in FIG. 5B) formed by the switching body 4 and the pivot shaft 30 inserted into the pivot hole 20 of the support plate 2, the coil Spring 5
The elastic force of (1) becomes the moment T1 of the downward force, and pivots the switching body 4 downward about the pivot shaft 40. Since the contact connection body 80 is located below the portion c of the switching body 4, the switching body 4 rotates until the switching body 4 comes into contact with the contact connection body 80 (FIG. 5C). Therefore, electrically from the circuit of the common terminal 6-the support plate 2-the switching body 4-the locking connection body 70-the normally closed terminal 7 to the common terminal-the support plate 2-the switching body 4-the contact connection body 80-the normally open. Switching to the circuit of terminal 8 completes the switching.

At the time of this switching, the switching body 4 of the above embodiment is a round bar made of a conductive metal wire material such as phosphor bronze for a spring having appropriate strength. Therefore, in the contact connection between the switching body 4 and the locking connection body 70 or the contact connection body 80, the switching body 4 is surely connected at a point, thereby preventing a malfunction or the like.

Next, when the force applied to the action piece 90 applied to the base of the operating body 3 is eliminated, the position of the coil spring 5 moves the operating body 3 and the operating body 3 as shown in FIG. Since it is located above the pivot shaft 30 which is pivotally supported, the elastic force of the coil spring becomes a moment T2 of an upward force, and the operating body 3 is rotated upward around the pivot shaft 30. The operating body 3 comes into contact with the locking body 22 and stops rotating (FIG. 5E).

When the position of the coil spring 5 is located above the pivot shaft 40 inserted into the pivot hole 21 of the support plate 2 of the switching body 4 with the rotation of the operating body 3, the elastic force of the coil spring 5 Becomes the moment T3 of the upward force, and pivots the switching body 4 upward about the pivot shaft 40, so that the switching body 4
Are locked by the locking connection body 70 connected to the normally closed terminal 7 (FIG. 5F). Electrically, from the common terminal 6-the support plate 2-the switching body 4-the contact connecting body 80-the normally open terminal 8 circuit,
The terminal is switched to the common terminal 6-support plate 2-switching body 4-locking connection body 70-normally-closed terminal 7, and the initial contact conduction state is established, and the switching is completed. Since the operating body 3 and the switching body 4 rotate through the pivot holes 20 and 21 of the support plate 2 via the pivot shafts 30 and 40, respectively, there is almost no wear.

In the above embodiment, the coil spring 5
The switch body 4 on the side of the pivotal support portion 40 is located at a contact position with the locking connection body 70 and the contact connection body 80 from the mounting position.
That is, since the point of action of the coil spring 5 as the mounting position of the switching body 4 is located earlier than the contact connection body 80, it acts to reduce bouncing and chattering of the switch.

The switching mechanism 4 for opening and closing the switch is a switch mechanism in which at least the strength of the operating body 3 is increased.
Since the pressure of the operating body 3 is transmitted via the coil spring 5, even if an excessive pressure is applied to the operating piece 90, there is no danger of being applied to the switching body 4 and reliable switching can be performed. Is possible. For example,
In the above-described embodiment, when the operating body 3 is made of a stainless steel metal wire of 0.3 mmφ and the switching body 4 is made of a 0.3 mmφ metal wire of phosphor bronze for spring, the base 1 A switch having a size of 6 mm square was manufactured. Also, when moving from the upper contact point to the lower contact point of the switch manufactured to this size, the number of times of bouncing due to vibration is about 1/10 compared to the case of the above-described conventional example, and the time during which bouncing occurs is reduced. It was about 3 ms, which was about 1/3 reduction. With respect to chattering, the same result as that of bouncing was obtained, and the service life was 2 million times.

[0031]

According to the present invention, the switch mechanism can be reduced in size with a simple structure by swinging the operating body and the switching body used in the switch mechanism with the pivot shaft and the pivot hole. Since the spring mounting position is farther from the pivot than the switching position, the elastic force of the coil spring is applied straight to the switching body, greatly reducing bouncing and chattering, making it ideal as a switch mechanism. . Furthermore, when the switching body is made of a round wire, it is connected to the locking connection body or the contact connection body by a point, and the contact conductivity is improved. Also, when assembling the switch mechanism of the present invention, the operating body and the switching body are held in a state of being pressed down by utilizing the spring property inside and slide-inserted between the support plates, so that assembly can be performed, so that workability is improved. The use of a jig makes it easy to attach the operating body and the switching body at once. Furthermore, even when only the coil spring is removed, the working body and the switching body do not fall apart, they can be made and stored, and when placing an order, the coil spring is placed between the working body and the switching body for a short time. As a result, the product can be completed even if there is a sudden order, and the life of the coil spring is not adversely affected because the coil spring is not required to be used for a long time. In addition,
Although the present invention has excellent effects such as providing a switch configuration that can be reduced in size while having a simple configuration as described above, it can be applied to a switch mechanism of a normal size. not.

[Brief description of the drawings]

FIG. 1 is a front view of an example of a switch mechanism according to the present invention.

FIG. 2 is a plan view of an example of a switch mechanism according to the present invention. FIG. 3 is a side view, and FIG. 4 is an exploded perspective view of a main part.
The switch mechanism according to the present invention includes a base 1, an operating body 3 for performing a switching operation, a switching body 4, and a coil spring 5.
And a support plate 2 supporting the operating body 3 and the switching body 4, and a common terminal 6, a normally closed terminal 7, and a normally open terminal 8 which are switched by switching.

FIG. 3 is a plan side view of an example of the switch mechanism according to the present invention.

FIG. 4 is a plan view of an example of a switch mechanism according to the present invention.

FIG. 5 is an explanatory diagram of a switching operation of the switch mechanism according to the present invention.

FIG. 6 is an explanatory view showing a conventional switch mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 10, 11, 12 Terminal insertion hole 13 Convex part 14 Concave part 20, 21 Pivot hole 22 Locking body 3 Actuator 30 Pivot shaft 31 Base 32, 33 Connection side 4 Switching body 40 Pivot shaft 4 Base 42, 43 Connection side 5 Coil spring 6 Common terminal 7 Normally closed terminal 70 Locking connection 8 Normally open terminal 80 Contact connection 9 Switch housing 90 Working piece 91 Locking projection

Claims (3)

[Claims] 1. A pair of conductive support plates standing upright facing a base and having at least one connected to a common terminal, and a pivot shaft formed on the support plate in a U-shape and provided at both ends. A pivoted operating body, a conductive switching body disposed in the opposite direction to the operating body, formed in a U-shape on the support plate, and pivotally supported by pivot shafts provided at both ends; A coil spring that connects between each side of the body opposite to the pivot axis, a locking body that positions the action piece above the plane connecting the switching body and the pivot, and a normally closed terminal A locking connection body that connects and positions the switching body in a steady state; a contact connection body connected to the normally open terminal at a position sandwiching the switching body between the locking connection body and the base; An operating piece for moving the operating body up and down, wherein the mounting position of the pivot of the operating body is located below the pivot of the switching body, Switch mechanism, characterized in that moving subject is located where. 2. The switch mechanism according to claim 1, wherein the switch is formed by bending a round bar into a U-shape. 3. The switch mechanism according to claim 1, wherein the coil spring is located at a contact position between the locking connection body and the contact connection body by the switching body on the pivot portion side from the mounting position.