KR910008022Y1 - Push switch - Google Patents

Abstract

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Description

Pushbutton switch

1 to 3 are views for explaining the pushbutton switch according to the embodiment of the present invention, Figure 1 is a cross-sectional view of the main part at the time of "off" the switch of the present invention.

2 is a sectional view of the main portion immediately after the switch "on" of the present invention.

3 is a sectional view showing the main parts of an overstroke at the present invention.

4 is a cross-sectional view showing the main part of the pushbutton switch proposed by the present applicant.

* Explanation of symbols for main parts of the drawings

2: upper case 2a: inner wall

3: bottom case 4: operating body

5: First Drive 6: 2nd Drive

7: coil spring 8: lead part

9: fixed contact 9a, 9b: fixed contact

10 tact spring 11: operating shaft

12 switch unit 13 variable resistor

14: bottom plate 15: case below

16a, 16b: Terminal 17: lid body

18 opening 19 wall member

20: upper case 21: opening

22: protrusion piece 23: convex part

24: first coil spring 25: second coil spring

26: first driving body 26a: engaging recess

26b: Clicking piece 26c: Concave portion

27: movable contact 27a: elastic contact portion

28: protrusion piece 29: second drive body

30: color 31: stopper

32: opening 33: the upper plate

The present invention relates to a pushbutton switch, in particular a pushbutton switch capable of obtaining a desired click and operating feel.

Conventionally, a pushbutton switch for assembling a spring is widely used as a switch for operation of various electrical appliances in that the click feeling when the tact spring of the dish shape is reversed is transmitted to the operator's finger to check the operation state. have.

In this type of pushbutton switch, when the operating body that moves freely and retracts is pressed, the operating body retracts and the tact spring which becomes the movable contact is pushed in and inverted. On ".

In addition, when the pressing force is removed, the tact spring returns to the original dish shape due to its elasticity, so that the operating body is pushed up to the initial position and returns to the switch "off" state before pressing.

In addition, since the reverse stroke of the tact spring is within 1 mm, the pushing amount of the operating body is generally set at such a degree, and the switching operation can be performed with a very delicate stroke.

However, in the conventional pushbutton switch as described above, since the tact spring becomes a stroke end when the tact spring is inverted, the clearance between the tact spring and the fixed contact becomes slightly wider due to dimensional error or the like, or When the reverse stroke is not met by the design expectations, there is a concern that even if the tact spring is inverted, the contact cannot be contacted with a sufficient contact input with respect to the fixed contact, thereby deteriorating the reliability of the contact.

In addition, if the stroke at the time of operation is extremely small and the reverse spring of the tact spring is the stroke end, it is not only inconvenient to obtain a good operating feeling, but also for the vehicle mounting where the click feeling is confirmed and deviated while driving. When it is used as a pushbutton switch, it becomes difficult to grasp the operation state with a finger, and it also affects operability.

Therefore, the applicant of the present application proposes a push button switch in Japanese Patent Application No. 62-140856 to solve the above problem.

4 is a plan view showing the configuration of a push button switch (hereinafter referred to as a source) related to this proposal, wherein a rectangular cylindrical upper case 2 formed by protruding an inner wall 2a made of a resin molded product is formed; The lower case 3 which closes the lower opening of this upper case 2 with a lid is provided, and the tact spring of a plate shape is provided in the inner surface of this lower case 3 via a pair of lead parts 8. 10 is disposed opposite the fixed contact 9.

In addition, the first driving body 5 and the second driving body 6 are separated from each other by the knitting force of the coil spring 7 so as to slide freely along the inner circumferential surface of the case 2 above. It is attached.

And the operating body 4 which pushes the 1st driving body 5 is attached with respect to the upper case 2, The 1st driving body 5 is pushed by this operating body 4, and a 2nd drive is carried out. It is comprised so that it may slide freely along the inner wall 2a to the sieve 6 direction.

When the operator pushes the operating body 4 during the operation of the pushbutton switch, the first driving body 5 descends along the inner wall 2a of the upper case 2 and is applied to the first driving body 5. The pressing jaw is transmitted to the second driving body 6 via the coil spring 7, and the second driving body 6 also descends along the inner wall 2a.

Then, the tact spring 10, which is the movable contact, is inverted by the second driving member 6, and the inverted portion of the tact spring 10 contacts the fixed contact 9 to be in the switch "on" state.

Also, when the operating body 4 is pushed in even after the switch "on" state, the first driving body 5 is pushed in a predetermined amount so that the coil spring 7 can contract. This is possible.

And when the pressing force with respect to the operating body 4 is released, the tact spring 10 will return to original dish shape by the elasticity of itself, and the 2nd driving body 6 will be pushed up and the coil spring 7 Also increases the length of the spring by its elasticity, so that the operating body 4 is also pushed up to return to the original state of the switch "off".

In this way, according to the said source, even if the contact pressure of the tact spring 10 with respect to the fixed contact 9 is inadequate due to a dimensional error or the like at the time of inversion of the tact spring 10, it receives a pressing jaw from the coil spring 7. Since the second driving body 6 exerts a force on the tact spring 10, the reliability of the contact is secured.

Moreover, since the overstroke whose operating force increases gradually with shrinkage of the coil spring 7 can be obtained, the operation feeling is also good and the operability is improved.

As described above, according to the source, the drawback of the conventional pushbutton switch without overstroke can be eliminated. However, since the click spring and the operating force characteristics of the pushbutton switch are determined by the tact spring 10, If you want to change these click feel or operating force characteristics, you have to adjust it in the tact spring 10 part.

However, as is well known, it is very difficult to adjust the tact spring 10 so as to obtain desired characteristics, and it is difficult for the source to set the characteristics of the click feel and the operating force to a desired value.

Moreover, in the source, when the tact spring 10 at the time of operation is large, the click sound may be annoying when used in a quiet environment, for example, a vehicle-mounted switch.

The present invention has been made to solve the above-described problems with the source, and its object is to provide a pushburnton switch which can easily set a desired click feel and an operation feel, and can also reduce the click sound.

In order to solve the above problems, in the present invention, the movable contact moves along the wall member against the knitting force of the knitting spring by the push operation, and the movable contact fixed to the end of the driving body is the movable contact. A pushbutton switch in which a switching operation is performed in contact with a fixed contact, which is disposed opposite to the pushbutton switch, wherein a click piece capable of elastic displacement in a direction perpendicular to the moving direction is formed on a circumferential wall of the drive body. The maximum stroke length is set larger than the distance between the movable contact and the fixed contact.

According to the above constitution, when the driving body is pushed by the pushing operation, the driving body moves along the wall member against the knitting force of the knitting spring.

A movable contact is attached to the front end of the drive body, and a click piece is formed on the circumferential wall. The click piece is formed on the wall member by the movement of the drive body, and is bent in a direction perpendicular to the moving direction by the convex portion. Jump over the convexity.

At this time, it is possible to obtain a click feeling generated when the click piece and the convex portion are caught and peeled off each other, and the movable contact is brought into contact with the fixed contact by the movement of the driving body, and the switch " on "

When the driving body is pushed further in this contact state, the knitting spring contracts, the driving body moves by the maximum stroke length, and the overstroke operation is performed.

Therefore, the click feel and the operating force characteristics desired for the pushbutton switch can be set by the shape of the convex portion formed in the wall member.

In addition, the overstroke operation in which the operating force gradually increases with the knitting spring against the drive body can be performed, and the switch operation can be surely performed with a good operating feeling.

Next, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

1 to 3 show the structure of the main part of the embodiment of the present invention, in which FIG. 1 is a sectional view of the main part at the time of switch "off", and FIG. 2 is a sectional view of the main part immediately after the switch "on", and FIG. , Sectional drawing of main part during overstroke.

In the embodiment of the present invention, as shown by the dashed-dotted line in FIG. 1, the variable resistor 13 is formed in parallel with the switch part 12 with respect to the common operation shaft 11 connected to the operating body 4. It is composed.

However, this variable resistor 13 is well-known, and this part is not an essential part of the present invention, so the description thereof is omitted.

As shown in FIG. 1, the lower case 15 of a rectangular cylindrical shape is fixed on the substantially rectangular bottom plate 14, and the fixed contacts 9a and 9b are provided on the bottom plate of this lower case 15. As shown in FIG. These are arranged side by side without being in contact with each other, and these fixed contacts are led out of the case body by the terminals 16a and 16b, respectively.

In Figs. 1 to 3, these inner fixed contacts 9a and terminals 16a are shown.

On the upper end surface of the lower case 15 described above, the lid body 17 is fixed to cover the lower case 15, and an opening 18 is formed in the center of the lid body 17.

A circular wall member 19 is fixed on the lid 17, and the upper case 20 is fixed on the wall member 19, and the upper case 20 has an opening 21 at the center thereof. ) Is formed, and the periphery of the opening 21 protrudes downward to form a protruding piece 22.

In addition, the convex part 23 is formed in the position which opposes each other of the inner peripheral surface of the wall member 19, respectively.

In this way, as the bottom plate 14, the lower case 15, the lid 17, the wall member 19, and the upper case 20, the case body of the switch part 12 in an Example is formed.

The second coil spring 25 is disposed on the bottom plate of the lower case 15 as described above, and is sewn upward by the second coil spring 25 to form a ring-shaped second drive member in the lower case 15. (29) is formed.

The movable contact 27 is fixed to the surface of the plate facing the fixed contacts 9a and 9b of the second driving body 29 in a range of covering them over the fixed contacts 9a and 9b. The movable contact 27 is formed with an elastic contact portion 27a in contact with the fixed contacts 9a and 9b.

In addition, the protruding piece 28 is formed in the 2nd drive body 29 in the ring shape so that it may protrude upward from the opening 18. As shown in FIG.

The first driving body 26 is formed on the second driving body 29 so that the above-described protruding piece 28 of the second driving body 29 is engaged. The recessed part 26c which is concave upward is formed in the center part, The peripheral edge part of this 1st drive body 26 is integrally extended, and the engaging recessed part 26a which is recessed downward is formed in this extension part. .

An elastic click piece 26b is formed at the end of the extension portion, that is, the circumferential wall of the first drive member 26.

A first coil spring 24 is arranged between the lid 17 and the engagement recess 26a to bias the first driver 26 upward.

In addition, the end of the operating shaft 11 is engaged with the recess 26c of the first driving member 26, and the collar 30 is formed on the operating shaft 11, and the upper case 20 of the upper case 20 is formed. The stopper 31 is fixed along the circumferential edge of the opening 21, and the stopper 31 and the collar 30 form a means for preventing the operation shaft 11 from being pulled out.

And the opening 32 is formed in the center part of the case body upper plate 33, and the operation body 4 protrudes from this opening 32, and the operation shaft 11 is moved with respect to the case body of the pushbutton switch of an Example. It is fixed.

In FIG. 1, the first driving body 26 is contacted by the first coil spring 24 to face the inner surface of the upper case 20, and upwardly knitted, and the second driving spring is driven by the second coil spring 25. The body 29 is knitted upward so that the end surface of the protruding piece 28 faces the first driving body 26 so that the surface of the plate of the second driving body 29 is in contact with the lid body 17. Doing.

For this reason, the operation shaft 11 is knitted upward, the collar 30 abuts against the stopper 31, and the operation body 4 takes the position which protruded the most from the opening 32. As shown in FIG.

In the embodiment, the first and second driving bodies 26 and 29 are moved from the above-described state of FIG. 1 to the state of FIG. 3 in which the operating body 4 is pushed the most to the opening 32. The maximum stroke length to be moved is set larger than the distance between the movable contacts 27 in the fixed contacts 9a and 9b.

In the embodiment of the present invention of this configuration, the drive body is composed of the first drive body 26 and the second drive body 29, and the knitting spring is formed by the first coil spring 24 and the second coil spring 25. Consists of.

The operation of the embodiment of the present invention described above will be described next.

As shown in FIG. 1, when the operator pushes the operating body 4 downward with respect to the pushbutton switch in the "off" state, the first drive is performed by the collar 30 of the operating shaft 11. As the sieve 26 moves downward, the upper end surface of the first driving body 26 falls off from the inner surface of the upper case 20, and the first coil spring 24 starts to contract.

At the same time, the second driving body 29 is pushed by the first driving body 26 so that the surface of the plate of the second driving body 29 is separated from the lid body 17 so that the second coil spring 25 is removed. Start contraction.

Then, when the operating body 4 is pushed downward, the first and second coil springs 24 and 25 gradually contract, and the second driving body 29 moves in the lower case 15 direction. When the click piece 26b is bent inwardly along this convex portion 23, the click piece is obtained when passing over the convex portion 23, and as shown in Fig. 2, the elastic contact portions 27a are fixed contacts 9a, ( 9b).

In this state, the terminals 16a and 16b are brought into a conducting state, and a switch " on " operation of the pushbutton switch is performed.

Then, when the operating body 4 is repeatedly pushed in the state of the switch " on " shown in FIG. 2, an overstroke operation is performed so that the end face of the click piece 26b is in contact with the lid 17. The first and second drives 26, 29 move until the maximum stroke length is reached.

In accordance with this movement, the first and second coil springs 24 and 25 contract and the end surface of the click piece 26b of the first driving member 26 is in contact with the lid 17. In this case, the movable contact 27 of the second driving body 29 is in contact with the fixed contacts 9a and 9b of the lower case 15 in the substantially entire surface.

In this state, when the pressing force applied to the operation piece 4 is released, the first and second drive bodies 26, (by the knitting force of the first and second coil springs 24, 25) ( 29 moves upward, the first drive body 26 pushes up the operation shaft 11 via the collar 30, and the operation shaft (a) until the collar 30 contacts the stopper 31. 11) moves to return to the switch " off " state shown in FIG.

As described above, in the above embodiment, the shape of the convex portion 23 formed in the wall member 19 imparts the characteristics of the click sense and the operating force of the pushbutton switch operation, so that the wall having the convex portion 23 of the predetermined shape is provided. By using the member 19, the desired click feeling and the operation feeling can be easily set.

In addition, since no tact spring is used, the click sound is reduced, for example, the click sound at the time of "on" and "off" operation of the switch is unobtrusive even when used in a quiet environment such as a vehicle-mounted switch. Do not.

Furthermore, since the overstroke operation in which the operating force gradually increases in response to the contraction of the first and second coil springs 24 and 25 is possible, a good operating feeling is ensured and a switch according to the dimensional error is used. Poor contact at the time of "on" can be prevented.

Therefore, when it is used in a state where it is difficult to confirm the click feel, for example, when it is used as a vehicle-mounted pushbutton switch, the desired click feel and the operation feel are set, the operation state is grasped to grasp the good operation feel. Can be used as

In the above embodiment, the case where the driving body is composed of the first driving body and the second driving body has been described, but the present invention is not limited to this embodiment, and the first and second driving bodies are integrated. It can also be composed of two driving bodies, in which case the second coil spring can be omitted.

In the above embodiment, the case where the convex portion is formed at the second position at the position opposite to the inner circumferential surface of the wall member has been described. For example, the convex portion has a circular shape over the entire circumference of the inner circumferential surface of the wall member. It may be formed.

As described in detail above, according to the present invention, the shape of the convex portion formed on the wall member makes it possible to easily set a desired click feel for the pushbutton switch, to obtain a comfortable click sound that is not unobtrusive, and at the same time to have an operating force. Increasing the overstroke operation allows a good operation feeling to perform a switching operation without contact failure when switching the switch.

Claims (1)

The driving body moves along the wall member against the knitting force of the knitting spring by the pushed operation, and the movable contact fixed to the end of the driving body is switched in contact with the fixed contact, which is disposed opposite the movable contact. In the pushbutton switch in which the operation is performed, a click piece 26b capable of elastic displacement in a direction perpendicular to the moving direction is formed on the circumferential wall of the drive body 26, and the click piece 26b is provided on the wall member. ) Is formed to be caught and peeled off, and the maximum stroke length of the drive body 26 is set larger than the distance between the movable contact 27 and the fixed contacts 9a, 9b. Push button switch, characterized in that made.