JPH08321226A - Switch structure - Google Patents

Abstract

PURPOSE: To offer a switch structure which can enhance the working effectiveness with an improved easiness in assembly works and can prevent production of the molding dust resulting from pressure fitting of a terminal as likely according to the conventional technique. CONSTITUTION: A terminal unit mounting part 9, terminal mounting groove, and a recess 12 for insertion of push button are formed at the peripheral wall 7 of a case 1, and the part bounded by the peripheral wall 7 of the case 1 is used as a snap action space 15, A movable member unit is structured at least so that a movable terminal 32 is swingably installed on a common terminal 31, and is accommodated in the snap action space 15, and the commoner terminal 31 is mounted in the terminal mounting groove. A push button 6 to operate the movable terminal 32 is inserted in the recess 12, and in the terminal unit mounting part 9 a terminal unit 4 is installed where stationary terminals 16, 17 are held by a holding block 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch structure such as a micro switch having a snap action mechanism.

[0002]

2. Description of the Related Art The structure of a conventional microswitch is shown in FIG. This micro switch includes a case 40, a cover (not shown), two fixed terminals 41 and 42, a common terminal 43, a movable terminal 44, a movable spring 45, a movable support piece 46, and a push button. And 47.

The case 40 is constructed by raising a peripheral wall portion 48 around the peripheral edge of a flat plate-shaped bottom portion 40A, and fixed terminal insertion groove portions 49 and 50 are formed in a right side portion 48B of the peripheral wall portion 48. Has been formed. The fixed terminals 41, 42 are press-fitted into the fixed terminal insertion groove portions 49, 50.

[0004]

However, in the above-mentioned conventional micro switch, the fixed terminal insertion groove portions 49 and 50 are formed in the right side portion 48B of the peripheral wall portion 48, and these fixed terminal insertion groove portions 49 and 50 are formed. To the fixed terminal 4
Since 1, 42 are designed to be attached by press fitting,
Assemblability was poor, and therefore work efficiency was reduced,
In addition, there is a problem that molding powder is generated by press-fitting the terminals, and the molding powder enters the inside of the microswitch to cause an accident such as a failure.

The present invention has been made in view of the above problems, and its object is to improve the workability by improving the assembling property, and moreover, by the conventional terminal press-fitting. It is to provide a switch structure capable of preventing the generation of molding powder.

[0006]

To achieve the above object, in a switch structure according to the invention of claim 1, at least a terminal unit mounting portion is formed on a peripheral wall portion of a case, and the terminal unit mounting portion includes: It is characterized in that a terminal unit in which fixed terminals are held by a holding block is mounted.

In order to achieve the above object, in the switch structure according to the invention of claim 2, a terminal unit mounting portion, a terminal mounting groove portion, and a push button insertion concave portion are formed in the peripheral wall portion of the case. At the same time, the portion surrounded by the peripheral wall portion of the case is formed as a snap action space portion, and in this snap action space portion, a movable member unit in which at least a movable terminal is swingably assembled is housed and the common terminal is stored. While mounting the in the terminal mounting groove,
A push button for operating the movable terminal is inserted into the push button insertion recess, and a terminal unit having a fixed terminal held by a holding block is attached to the terminal unit attachment portion.

In order to achieve the above object, a switch structure according to a third aspect of the invention is the switch structure according to the first or second aspect, wherein the terminal unit includes a first fixed terminal and a first fixed terminal. The two fixed terminals are integrated with a holding block made of synthetic resin by insert molding.

In order to achieve the above object, the switch structure according to the invention of claim 4 is the switch structure according to claim 1 or claim 2, wherein the terminal units are connected to each other by a connecting portion. The fixed terminal and the second fixed terminal are integrated with a holding block mounted on the terminal unit mounting portion by insert molding in a state in which the fixed terminal and the second fixed terminal are bent at a connecting portion with the connecting portion and face each other, and the connecting portion is connected. Removed and configured.

In order to achieve the above object, a switch structure according to a fifth aspect of the present invention is the switch structure according to the second, third or fourth aspect, wherein the holding block is insulated from the insulating block. The connecting portion is formed with a connecting drop-out window portion through which the connecting portion is exposed, and the side surface portion of the insulating mounting portion is provided with the other engaging portion that engages with one engaging portion of the terminal unit mounting portion. Configured.

[0011]

With this structure, the fixed terminal can be attached to the case by attaching the terminal unit to the terminal unit attaching portion of the peripheral wall of the case at the holding block portion. Therefore, the assemblability is improved, the work efficiency is improved, the generation of molding powder due to the conventional terminal press-fitting can be prevented, and accidents such as breakdown due to this molding powder can be prevented.

Further, not only the fixed terminal can be attached to the case by attaching the terminal unit to the terminal unit attaching portion of the peripheral wall portion of the case at the holding block portion, but also the movable member unit and the push button. ,
It becomes possible to incorporate the unit into the case. Therefore, the assemblability is improved, the work efficiency is improved, the generation of molding powder due to the conventional terminal press-fitting can be prevented, and accidents such as breakdown due to this molding powder can be prevented.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view of the switch structure according to the present invention with a part thereof omitted, FIG. 2 is a plan view with a part of the switch structure omitted for explaining the mounting of the terminal unit, and FIG. 3 is a perspective view of the terminal unit. .

The switch structure according to the present invention will be described by taking a micro switch having a snap action mechanism as an example. The micro switch includes a housing 3 including a case 1 and a cover 2, a terminal unit 4, a movable member unit 5, and a push button 6.

The case 1 is constructed by raising a peripheral wall portion 7 at the peripheral edge of a flat plate-shaped bottom surface portion 1A. The diagonal position of the peripheral wall portion 7, that is, the left side portion 7A and the front side portion of the peripheral wall portion 7. Mounting holes 8 are provided in a corner formed by 7C and a corner formed by the right side portion 7B and the rear side portion 7D of the peripheral wall portion 7. The right side portion 7B is formed with a terminal unit mounting portion 9 formed of a cutout portion, and the side surface portions 9a of the terminal unit mounting portion 9 facing each other are formed with an engaging recess 10 as one engaging portion. I am doing it.

A terminal mounting groove portion 11 is formed in the front side portion 7C of the peripheral wall portion 7, and a push button insertion concave portion 12 and a cover locking hole portion 13 which are notches are formed in the rear side portion 7D. I am doing it. Further, a terminal insertion groove portion 14 is formed on the inner surface of the rear side portion 7D. The portion surrounded by the peripheral wall portion 7 of the case 1 serves as a snap action space portion 15.

The terminal unit 4 includes a first fixed terminal 1
6 and the second fixed terminal 17 are integrated with a holding block 18 made of synthetic resin by insert molding. That is, the first fixed terminal 16 and the second fixed terminal 1
7 and the adjacent terminal portions 19 as shown in (1) of FIG.
Are supplied in the state of a hoop material that is connected to each other at the connecting portion 20. In this case, the fixed contact 21 is formed on the contact forming portion 19A of the terminal portion 19, the hole 22 and the chamfered portion 23 are formed on the connecting leg portion 19B, and the other surface is formed on the intermediate portion. Engaging protrusions 24, which are engaging portions, are formed by cutting and raising, and ear pieces 25 are formed on both sides of the intermediate portion. The dotted line portion is the cut portion 26.

The hoop material is cut into a pair of terminal portions 19 connected by one connecting portion 20, and these terminal portions 19 are connected to each other.
Is bent at a right angle to the joint portion 20 at a connection point with the joint portion 20, is set in a mold (not shown), and is integrated with the holding block 18 by insert molding. In this case, the holding block 18 is the lid 2
7 and the insulating mounting portion 28, and the insulating mounting portion 2
A connecting drop window 29 is formed on the inner side of 8, and the insulating creepage distance is expanded by forming the connecting drop window 29. Then, the connecting leg portion 19B of the terminal portion 19 projects outward from the lid portion 27, and the insulating mounting portion 2
8, a contact forming portion 19A projects forward, an engaging protrusion 24 projects from the outer surface of the insulating mounting portion 28, and the connecting window 20 has the connecting portion 20.
Is exposed.

In the cutting process, the connecting portion 20 exposed in the connecting window portion 29 is cut off to manufacture the terminal unit 4.

The movable member unit 5 has a common terminal 31.
And a movable terminal 32, a movable spring 33, and a movable support piece 34. The common terminal 31 is bent in a crank shape, and the engaging portion 37 is provided at the front side portion 31A.
And the first corner portion is made into the spring fulcrum portion 31B, and the second
A movable supporting piece pivotally supporting hole portion 31C is formed at a corner portion of the, and the connecting leg portion 31D is bent at a right angle.

The movable terminal 32 has a surface portion 32A.
The opening 33 has an opening 33, and the movable contact 34 at the tip thereof. The spring engaging portion 35 is provided at the leading edge of the opening 33.
However, movable support piece pivotally supporting portions 36 are formed at the rear edge portions, respectively.

Then, the front side portion 31A of the common terminal 31 is inserted into the opening 33 of the movable terminal 32, and the tip end portion of the movable supporting piece 34 is pivotally supported on the movable supporting piece pivotally supporting portion 36 and is movable supported. The base end of the piece 34 is pivotally supported by the movable support piece pivotally supporting hole 31C, and further, the base end of the movable spring 33 is brought into contact with the spring fulcrum 31B, and the tip of the movable spring 33 is spring-locked. The movable terminal 32, the movable spring 33, and the movable supporting piece 34 are assembled to the common terminal 31 by being locked to the portion 35.

The locking portion 37 of the common terminal 31 of the movable member unit 5 is fitted into the terminal insertion groove portion 14 of the case 1.
Then, the common terminals 31 are inserted and locked in the terminal mounting groove portions 11 of the case 1, respectively, and the movable member unit 5 is housed in the snap action space portion 15 surrounded by the peripheral wall portion 7 of the case 1. The push button 6 is slidably inserted into the push button insertion recess 12 of the case 1, and the base end portion 6a of the push button 6 is brought into contact with the end portion of the movable terminal 32. Inserting the insulating mounting portion 28 of the holding block 18 of the terminal unit 4 in the terminal unit mounting portion 9 of FIG.
The engaging protrusion 24 provided on the outer surface of the insulating mounting portion 28 is engaged with the engaging recess 10 of the terminal unit mounting portion 9, and the lid 27 is fitted into the lid fitting recess 9A of the terminal unit mounting portion 9. Then, the terminal unit 4 is attached to the case 19. In this case, the first fixed terminal 16 and the second fixed terminal 1
7 between the fixed contacts 21 and the movable contact 34 of the movable terminal 32.
, The movable contact 34 contacts the fixed contact 21 of the first first fixed terminal 16. And the case 1
The cover 2 is attached to the above to configure the microswitch.

In the process of manufacturing the terminal unit 4,
By cutting the second fixed terminal 17 at the cut portion 26, the terminal unit 4 having one fixed terminal 16 and the fixed contact 21 included in the fixed terminal 16 and the dummy fixed terminal 21 is provided. A micro switch is manufactured.

According to the above-described embodiment, the fixed terminals 16 and 17 are mounted on the case 1 by mounting the terminal unit 4 at the holding block 18 on the terminal unit mounting portion 9 of the peripheral wall portion 7 of the case 1. Not only can it be attached, but also the movable member unit 5 and the push button 6 can be incorporated in the case 1 as a unit.
Therefore, the assemblability is improved and the work efficiency is improved,
Moreover, it is possible to prevent the generation of molding powder due to the conventional terminal press-fitting, and it is possible to prevent accidents such as a failure due to this molding powder.

[0026]

As described above, in the switch structure according to the invention of claim 1, at least the terminal unit mounting portion is formed on the peripheral wall of the case, and the fixed terminal is held in the terminal unit mounting portion by the holding block. By mounting the held terminal unit, the fixed terminal can be mounted on the case by mounting the terminal unit on the terminal block mounting portion of the peripheral wall of the case at the holding block. Therefore, the assemblability is improved, the work efficiency is improved, the generation of molding powder due to the conventional terminal press-fitting can be prevented, and accidents such as breakdown due to this molding powder can be prevented.

Further, in the switch structure according to the invention of claim 2, the terminal unit mounting portion, the terminal mounting groove portion, and the push button insertion concave portion are formed on the peripheral wall portion of the case, and the peripheral wall portion of the case is surrounded. The movable member unit in which at least the movable terminal is swingably assembled to the common terminal is housed in the snap action space portion, and the common terminal is mounted in the terminal mounting groove portion. A block for holding the terminal unit is obtained by inserting a push button for operating the movable terminal into the push button insertion concave portion and mounting a terminal unit holding a fixed terminal by a holding block in the terminal unit mounting portion. The fixed terminal can be attached to the case by attaching it to the terminal unit attachment part on the peripheral wall of the case Or the movable member unit and the push button together, to be incorporated in the casing in units. Therefore, the assemblability is improved, the work efficiency is improved, the generation of molding powder due to the conventional terminal press-fitting can be prevented, and accidents such as breakdown due to this molding powder can be prevented.

A switch structure according to a third aspect of the present invention is the switch structure according to the first or second aspect, wherein the terminal unit is formed by insert molding the first fixed terminal and the second fixed terminal. By being configured integrally with the holding block made of synthetic resin, not only the same effect as the effect of the invention of claim 2 described above can be obtained, but also the production of the terminal unit is facilitated, and the assemblability is improved and the work is improved. It can contribute to the improvement of efficiency.

A switch structure according to a fourth aspect of the present invention is the switch structure according to the first or second aspect, wherein the terminal units are connected to each other at a connecting portion.
The fixed terminal and the second fixed terminal are integrated with a holding block mounted on the terminal unit mounting portion by insert molding in a state in which the fixed terminal and the second fixed terminal are bent at the connecting portion of the connecting portion and face each other, and the connecting portion is connected. By deleting the configuration, not only the same effect as the effect of the invention of claim 2 described above can be obtained, but also the production of the terminal unit becomes easy,
It can contribute to the improvement of the assembling property and the work efficiency.

A switch structure according to a fifth aspect of the present invention is the switch structure according to the second, third or fourth aspect, wherein the holding block is exposed to the insulating mounting portion by the connecting portion. A connecting drop-off window is formed, and the side surface of the insulating mounting part is provided with the other engaging part that engages with one engaging part of the terminal unit mounting part. Not only the same effect as the effect of the invention of Item 2 can be obtained, but also the insulation creepage distance can be increased, and the side surface portion of the insulation mounting portion is engaged with one engagement portion of the terminal unit mounting portion. By providing the other engaging portion, the terminal unit can be slidably inserted into the terminal unit mounting portion, which can contribute to the improvement of the assembling property and the work efficiency.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a switch structure according to the present invention with a part thereof omitted.

FIG. 2 is a partially omitted plan view for explaining mounting of a terminal unit in the switch structure.

FIG. 3 is a perspective view of a terminal unit.

FIG. 4A is a plan view of a terminal material in which adjacent terminal portions formed of a hoop material are connected to each other at a connecting portion.
(2) is a plan view of a terminal unit in which a terminal material is integrated with a holding block by insert molding.

FIG. 5 is an explanatory diagram of an engaging protrusion of the terminal unit.

FIG. 6 is a plan view showing a state in which a cover of a conventional microswitch as a switch structure is removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 case 4 terminal unit 5 movable member unit 6 push button 7 peripheral wall section 9 terminal unit mounting section 11 terminal mounting groove section 12 push button insertion recess section 15 snap action space section 16 fixed terminal 17 fixed terminal 18 holding block 31 common terminal 32 movable terminal

Claims (5)

[Claims] 1. A switch structure characterized in that at least a terminal unit mounting portion is formed on a peripheral wall portion of a case, and a terminal unit having fixed terminals held by a holding block is mounted on the terminal unit mounting portion. 2. A terminal unit mounting portion, a terminal mounting groove portion, and a push button insertion concave portion are formed on the peripheral wall portion of the case, and a portion surrounded by the peripheral wall portion of the case is formed as a snap action space portion. In this snap action space, at least a movable member unit in which a movable terminal is swingably assembled to a common terminal is housed, the common terminal is mounted in the terminal mounting groove, and the movable terminal is mounted in the push button insertion recess. A switch structure in which a push button to be operated is inserted, and a terminal unit in which fixed terminals are held by a holding block is mounted in the terminal unit mounting portion. 3. The switch structure according to claim 1, wherein the terminal unit is formed by integrating a first fixed terminal and a second fixed terminal into a holding block made of synthetic resin by insert molding. . 4. The terminal unit is insert-molded in a state where the first fixed terminal and the second fixed terminal connected to each other at a connecting portion are bent at a connecting portion of the connecting portion and face each other. The switch structure according to claim 1 or 2, wherein the switch structure is integrated with a holding block mounted on the mounting portion and the connecting portion is deleted. 5. The holding block is provided with a connection drop-down window portion in which the connecting portion is exposed at the insulating mounting portion, and one side of the terminal unit mounting portion is provided on a side surface portion of the insulating mounting portion. The switch structure according to claim 2, 3 or 4, wherein the other engaging portion that engages with the joining portion is provided.