JPH0441546Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a push button switch with a built-in tactile spring and a click feel.

[Conventional technology]

Push-button switches incorporating tact springs are widely used as operating switches for various electrical appliances because the click sensation when the round-shaped tact spring is reversed is transmitted to the operator's fingers, allowing the user to confirm the operating status. There is.

In this type of push button switch, when the operating body that can move forward and backward is pressed, the operating body retreats and pushes in the tact spring, which is a movable contact, so the tact spring is reversed, and this reversal causes the tact spring to come into contact with the fixed contact. It's starting to turn on. Furthermore, when the pressing force is removed, the tact spring returns to its original round bowl shape due to its elasticity, thereby pushing up the operating body, advancing the operating body to its initial position and returning to the switch-off state before pressing. Since the reversal stroke of the tact spring is within 1 mm, the pushing amount of the operating body is generally set to the same extent as this, so that the switching operation can be performed with an extremely delicate stroke.

[Problem that the invention attempts to solve]

However, in the conventional push button switch as described above, the stroke end occurs when the tact spring reverses, so the clearance between the tact spring and the fixed contact becomes slightly wider due to dimensional errors, or the tact If the reversal stroke of the spring does not meet the expected design value, even if the tact spring reverses, it will not be able to contact the fixed contact with sufficient contact pressure, resulting in a loss of contact reliability. There was a risk that it would happen. Also, if the stroke during operation is extremely small and the end of the stroke is when the tact spring is reversed,
Not only is there a problem in that it is difficult to obtain a good operating feel, but in the case of in-vehicle push-button switches, where it is difficult to confirm the click feeling while driving, it is difficult to grasp the operating status by the touch of the fingers, which reduces operability. It will also cause trouble.

Therefore, it is an object of the present invention to provide a push button switch that is highly reliable, provides a good operating feel, and has excellent assembly workability.

[Means for solving problems]

In order to achieve the above object, the present invention is a push button switch in which a tact spring is reversed by pressing an operating body, and the reversed tact spring contacts a fixed contact to perform a switching operation. a first case and a second case; the first case is provided with a guide wall having a stopper at an open end; A first driving body for transmitting a pressing force and a second driving body for reversing the tact spring are housed via a coil spring, and the tact spring and the fixed contact are housed in the second case. The present invention is characterized in that it is configured such that movement of the operating body after the tact spring is reversed is allowed by contraction of the coil spring.

[Effect]

According to the above means, when the operating body is pressed, the pressing force is transmitted to the second driving body via the first driving body and the coil spring, so that the tact spring is reversed, and when the operating body is further pressed from this state, The coil spring contracts to obtain overstroke, so the reversed tact spring is
The contact is biased by the driving body and comes into contact with the fixed contact with sufficient contact pressure. Further, the first and second driving bodies and the coil spring can be integrated into a first case, and by integrating this unitized first case with a second case incorporating a tact spring. Since the push button switch is assembled by pressing the push button, assembly work efficiency can be improved.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figures 1 to 3 are for explaining a push button switch according to an embodiment of the present invention. Figure 1 is a sectional view of the main part in the switch-off state, and Figure 2 is a sectional view of the main part immediately after the switch is turned on. , FIG. 3 is a sectional view of the main part during overstroke.

In these figures, the housing 1 of the resin molded product
is constructed by combining an upper case 2 shaped like a rectangular tube and a lower case 3 that closes a lower opening of the upper case 2. The tip 4a of the operating body 4 is inserted into the upper opening of the upper case 2. It is inserted so that it can advance and retreat freely. Furthermore, a substantially cylindrical guide wall 2a projects inside the upper case 2, and a space 2b surrounded by the guide wall 2a is made of a ring-shaped metal piece and is integrally connected to the operating body 4. First driving body 5 that reciprocates
, a second driving body 6 made of a cap-shaped synthetic resin material and in elastic contact with a tact spring to be described later, and a coil spring 7 interposed between the first and second driving bodies 5 and 6. It has been set up. On the other hand, in the lower case 3, a circular bowl-shaped tact spring 10 placed and fixed via a pair of lead parts 8 faces a fixed contact 9, and these lead parts 8 and fixed contacts 9 are connected to each other. It is electrically connected to an external circuit via different terminals 11.

In the push button switch having the above configuration, when the operator presses the operating body 4 with his or her finger from the state shown in FIG. Since the applied pressing force is transmitted to the second driver 6 via the coil spring 7, the tact spring 10 is pressed and reversed, and the second driver 6 also descends along the guide wall 2a. . When the tact spring 10, which is the movable contact, is reversed in this way,
As shown in FIG. 2, the inverted portion of the tactile spring 10 contacts the fixed contact 9 and enters the switch-on state. At the time of this inversion, the tactile spring 10 produces a clicking sensation, so the operator can determine the operating state through the sensation of his or her fingers. The change can now be confirmed.
Further, even after the switch is turned on, the coil spring 7 is allowed to further contract as shown in FIG. 3, so the operating body 4 can be pushed in a predetermined amount and an overstroke can be obtained.

Note that even if the contact pressure of the tact spring 10 against the fixed contact 9 is insufficient due to a dimensional error or the like when the tact spring 10 is reversed, the second driver 6 receiving the pressing force from the coil spring 7 1
Since 0 is energized, the reliability of contact is ensured.

When the pressing force pushing the operating body 4 is removed, the tact spring 10 returns to its original bowl shape due to its own elasticity, pushing up the second driving body 6 and removing the contracted coil spring 7. Since the spring length increases due to its own elasticity, the first driving body 5 and the operating body 4 are pushed up, thus returning to the switch-off state shown in the first switch.

In this way, in the above embodiment, the duct spring 10 in the reversed state is urged by the second driving body 6 during the overstroke after the switch is turned on, so that the tact spring 10 is forced against the fixed contact 9. It is possible to make contact with sufficient contact pressure, improving reliability. In addition, since an overstroke is obtained in which the operating force gradually increases in accordance with the contraction of the coil spring 7, a good operating feel is ensured, and the push button switch for automobiles, where the click feeling is difficult to confirm, is achieved. However, the operating state can be grasped by changes in the operating force, improving operability.

In the above embodiment, when the second driving body 6 is pushed into the space 2b of the upper case 2 during assembly, the guide wall 2a is bent and the second driving body 6 can be press-fitted, and after press-fitting, Since the stopper 2c of the guide wall 2a restricts the flange 6a of the second driving body 6, the first
Another advantage is that the second drive bodies 5, 6 and the coil spring 7 can be assembled into a unit in the upper case 2 while preventing them from falling off, making assembly easy.

[Effect of the invention] As explained above, according to the invention, an overstroke is obtained by contracting the coil spring interposed between the first and second driving bodies, so that the second driving body The tact spring, which the body contacts elastically, can be brought into contact with the fixed contact with sufficient contact pressure after reversing, improving reliability. Also, since the operating force gradually increases after the switch is turned on, a good operating feel can be ensured. Even when it is difficult to confirm the click feel of the tact spring, the operating state can be determined from changes in the operating force, making it suitable for use in vehicles.Moreover, the first and second driving bodies and the coil spring are connected to the guide wall. Since the push button switch can be integrated into the first case, it is possible to provide a push button switch with excellent functions such as improved assembly workability.

[Brief explanation of the drawing]

The figures are all for explaining one embodiment of the present invention. Figure 1 is a sectional view of the main part in the switch-off state, Figure 2 is a sectional view of the main part immediately after the switch is turned on, and Figure 3 is a sectional view of the main part during overstroke. It is a sectional view of the main part. 2... Upper case (first case), 2a... Guide wall, 2c... Stopper, 3... Lower case (second case), 4... Operating body, 5... First driving body, 6...Second driving body, 7...Coil spring, 8
...Lead part, 9...Fixed contact, 10...Tact spring.

Claims (1)

[Scope of utility model registration request] In a push button switch in which a tact spring is reversed by pressing an operating body, and the reversed tact spring contacts a fixed contact to perform a switching operation, a first case and a second case are joined and integrated with each other. a guide wall having a stopper at an opening end is provided in the first case, and a first driving body that moves reciprocatingly within the guide wall integrally with the operating body to transmit a pressing force; A second driving body for reversing the tact spring is housed via a coil spring, the tact spring and the fixed contact are disposed in the second case, and the tact spring and the fixed contact are disposed in the second case, A push button switch characterized in that movement of the operating body is permitted by contraction of the coil spring.