JPH0615232U - Push button switch - Google Patents

Abstract

(57) [Summary] [Purpose] In a push button switch using a coil spring as a movable contact, a predetermined contact pressure is secured from the time when the contact starts. [Structure] The push button 20 is urged in a push-up direction by a return spring 50. Spring holding portions 22, 22 are provided at the base of the push button 20. The spring holding portions 22, 22 are urged by the contact spring 60 in a downward direction with a weaker force than the return spring 50. The terminal 30 is positioned in the middle of the stroke of the spring holding portions 22, 22.
When the spring holding portion 22 descends below the terminal 30, the contact spring 60 separates from the spring holding portion 22 and is held by the terminal 30.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a push button switch used for detecting the insertion of a floppy disk, and more particularly to a push button switch which uses a spring as a movable contact to switch on and off during a relatively long stroke of the push button.

[0002]

[Prior art]

 As a small push button switch used for detecting the insertion of a floppy disk, there is one using a spring as a movable contact. FIG. 6 shows a conventional push button switch using a spring as a movable contact.

A push button 1 has a base portion axially inserted into a body 2 and a cover 3 to prevent the push button 1 from coming off. Inside the body 2, a return spring 4 for urging the push button 1 in the pushing-up direction is provided, and a contact spring 5 is provided outside the return spring 4. The contact spring 5 is suspended from the lower end portion of the push button 1, and the lower end is separated from the bottom of the body 1 when the push button 1 is not pushed downward. A pair of terminals 6 and 6 are attached to the bottom of the body 1 at intervals in a direction perpendicular to the central axis of the body.

When the head portion of the push button 1 protruding above the cover 3 is pushed downward against the pushing force of the return spring 4, the base portion of the push button 1 descends inside the body 2. When the lower end of the contact spring 5 comes into contact with the terminals 6 and 6, the contact spring 5 connects the terminals 6 and 6. Once the terminals 6 and 6 are electrically connected, the conductive state is maintained until the lower end of the contact spring 5 is separated from the terminals 6 and 6. That is, the on / off switching is performed during the relatively long stroke of the push button 1.

[0005]

[Problems to be solved by the device]

 Since such a push button switch has no sliding contact, the operating load of the push button is said to be more stable than that of a push button switch having sliding contact. However, when the contact spring 5, which is the contact, starts contacting the terminals 6 and 6, the contact pressure of the contact is 0. Sufficient contact pressure can be obtained unless the push button is pressed down considerably from the start of the on. Absent. Therefore, the contact of the contacts becomes unstable immediately after the start of turning on, and there arises a problem that Au plating is required or the stroke at the start of turning on is inaccurate.

In order to solve this problem, it is conceivable to weaken the return spring 4, but this makes it impossible to secure a sufficient return force, and the contact pressure is 0 at the start of turning on. There is no essential problem solution.

After the contact spring 5 starts contacting the terminals 6 and 6, the sum of the elastic force of the return spring 4 and the elastic force of the contact spring 5 becomes the operating load of the push button 1. . Therefore, it becomes difficult to set the operating load at the time of full stroke.

The present invention was devised in view of such circumstances, and a sufficient contact pressure can be secured from the start of turning on, a sufficient restoring force can be secured, and further, the setting of the operating load at the time of full stroke. Another object is to provide an easy push button switch.

[0009]

[Means for Solving the Problems]

 The push button switch according to the present invention can be pushed up and down, the head is projected from the body, and the spring holding portion is provided at the base portion, and the spring holding portion in a state where the push button is not pushed down. A pair of terminals attached to the body so that it becomes lower and is higher than the spring holding portion when the push button is pushed down to a full-stroke state, and the push-button is housed in the body and is attached in the push-up direction. The return spring that urges is housed in the body and urges the spring holding portion in a downward direction with a force weaker than that of the return spring, and when the spring holding portion becomes lower than the terminal pair, And a contact spring held between the terminal pairs to electrically connect the terminal pairs.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 is a semi-longitudinal side view of a push button switch showing an embodiment of the present invention, FIG. 2 is a plan view showing a state in which the cover of the push button switch is removed, and FIG. 3 is a half view for explaining the operation of the push button switch. It is a vertical side view.

As shown in FIGS. 1 and 2, the push button switch includes a body 10 having an open upper surface, a push button 20 having a base portion inserted into the body 10 from above, and a pair of push buttons mounted on a lower portion of the body 10. The terminals 30 and 30 are provided.

The push button 20 is movable in the axial direction and is prevented from coming off by a cover 40 attached to the body 10 from above. The head portion of the push button 20 penetrates through the central portion of the cover 40 and projects above it. The base portion of the push button 20 is a cylindrical portion 21, and a pair of spring holding portions 22, 22 that horizontally protrude outward are provided at the lower end of the cylindrical portion 21.

The terminals 30, 30 are symmetrically arranged on both sides of the central axis of the push button 20, and both ends thereof project outward from the lower end of the body 10. The parts of the terminals 30, 30 inside the body 10 are horizontally fixed at a predetermined height from the bottom surface of the body 10, and a pair of arcuate notches are formed so as not to obstruct the movement of the lower part of the push button 20. 31, 31 are provided. Then, as the push button 20 moves, the spring holding portions 22, 22 pass between the terminals 30, 30.

At the center of the body 10, a return spring 50 composed of a coil spring is arranged. The return spring 50 is interposed between the bottom surface of the body 10 and the push button 20 in a compressed state, and biases the push button 20 in the push-up direction. Further, the lower end thereof is externally fitted to the protrusion 11 provided at the center of the bottom surface of the body 10, and the upper end is inserted into the cylindrical portion 21 of the push button 20 to be positioned in the central portion of the body 10. There is.

A contact spring 60 formed of a coil spring is concentrically arranged outside the return spring 50 in the body 10. The contact spring 60 is externally fitted to the base of the push button 20, and is interposed in a compressed state between the spring holding portions 22 and 22 provided on the base and the cover 40, so that the push button 20 is pushed by the return spring 50. It is urged downward with a weak force. The lower end thereof faces the portion of the terminals 30, 30 inside the body 10 from above, and after the spring holding portions 22, 22 pass between the terminals 30, 30, they are separated from the spring holding portions 22, 22. It is held at a predetermined pressure in a portion of the body 30, 30.

FIG. 3 shows the full stroke state of the push button switch, and FIG. 4 is a graph showing the relationship between the stroke of the push button 20 and the operating load and the relationship between the stroke and the contact pressure of the contact.

In the natural state where the push button 20 cannot be pushed down, as shown in FIG. 1, the push button 20 is fixed at the upper limit position, the return spring 50 is in the most extended state, and the contact spring 60 is in the most contracted state. Is in a state. At this time, the force for urging the push button 20 upward, that is, the operating load of the push button 20, has a magnitude obtained by subtracting the push-down force of the contact spring 60 from the push-up force of the return spring 50.

When the push button 20 is pushed downward, the return spring 50 contracts and the contact spring 60 extends. Therefore, the operating load of the push button 20 gradually increases.

When the push button 20 is lowered and its spring holding portions 22, 22 pass between the terminals 30, 30, the lower end of the contact spring 60 contacts the terminals 30, 30, and the terminals 30, 30 are electrically connected. It When the lower end of the contact spring 60 comes into contact with the terminals 30 and 30, the lower end of the contact spring 60 separates from the spring holding portions 22 and 22, so that the pressing force of the contact spring 60 is entirely applied to the terminals 30 and 30. Therefore, a predetermined contact pressure is secured from the start of turning on.

On the other hand, the push button 20 does not receive the pushing-down force of the contact spring 60 and receives the pushing-up force of the return spring 50 as it is, so that the operating load thereof becomes slightly large.

When the push button 20 is further pushed down, the return spring 50 contracts and its operating load increases, but the length of the contact spring 60 does not change, so that the predetermined contact pressure is maintained as it is. This state continues until the time of full stroke shown in FIG.

When the push button 20 is returned, when the spring holding portions 22, 22 pass between the terminals 30, 30, the contact spring 60 is reliably separated from the terminals 30, 30, and Switches to the non-conducting state.

As described above, the push button switch uses the return spring 50 and the contact spring 60 having different operating directions and operating pressures with respect to the push button 20, and the terminal 30 is provided in the middle of the stroke of the spring holding portion 22 of the push button 20. , 30 are positioned to secure a predetermined contact pressure from the start of turning on. Therefore, the contact of the contacts is stable from the start of turning on, Au plating is not required, and the stroke at the start of turning on is accurate. Further, since it is not necessary to weaken the return spring 50, a sufficient return force can be secured. Further, after the contact spring 60 starts contacting the terminals 30 and 30, only the pushing force of the return spring 50 acts as the actuation load of the push button 20, so that the actuation load at full stroke can be easily set. Become.

Although the above embodiment uses the pair of terminals 30 and 30, as shown in FIG. 5, the configuration of two circuits and two contacts using two pairs of terminals 30a and 30a and terminals 30b and 30b. Can also be

[0025]

As described above, in the case of the push button switch according to the present invention, when the contact spring comes into contact with the terminal pair, the pushing-down force is fully applied to the terminal pair, so that the contact spring comes into contact with the terminal pair. A sufficient contact pressure is secured from the point of time. Therefore, the contact is stable from the start of turning on, Au plating is not required, and the stroke at the start of turning is accurate. Since there is no need to weaken the return spring, sufficient return force is secured. After the contact spring starts contacting the terminal pair, only the elastic force of the return spring becomes the operating load of the push button. Therefore, it becomes easy to set the operating load at full stroke.

[Brief description of drawings]

FIG. 1 is a semi-longitudinal side view of a push button switch according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state where the cover of the push button switch is removed.

FIG. 3 is a semi-longitudinal side view for explaining the operation of the push button switch.

FIG. 4 is a graph showing the relationship between the stroke of the push button and the operating load and contact pressure.

FIG. 5 is a plan view of a push button switch according to another embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a conventional push button switch.

[Explanation of symbols]

 10 Body 20 Push Button 22 Spring Holding Section 30 Terminal 50 Return Spring 60 Contact Spring

Claims (1)

[Scope of utility model registration request] 1. A push button that can be pushed up and down, has a head protruding from a body, and a spring holding portion provided at a base portion, and a push button that is lower than the spring holding portion when the push button is not pushed down, A pair of terminals attached to the body so that the push button is higher than the spring holding portion when the push button is pushed down to a full stroke state; and a return spring housed in the body for urging the push button in the pushing direction. , Housed in the body, urging the spring holding portion in a downward direction with a weaker force than the return spring, and being held by the terminal pair when the spring holding portion becomes lower than the terminal pair. A push button switch, comprising: a contact spring for electrically connecting the two.