JPH0218896Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a push button switch equipped with a movable contact plate that is rotatably operated.

As this type of push button switch, for example, the one shown in FIG. 1 has been considered in the past.
This push button switch is provided with a stem 3 that passes through a lid 2 of a case 1, and this stem 3 is biased outward by a spring 4 inside the case 1, and a fixed contact plate 5 and a movable contact plate 6 are arranged in parallel. are made to penetrate the bottom of the case 1 and protrude inwardly and outwardly, and contact protrusions 5a, 6a are provided on the mutually opposing surfaces of the fixed contact plate 5 and the movable contact plate 6.
are provided in a protruding manner, and a bent portion 6b that is pressed by the stem 3 is provided at the upper end of the movable contact plate 6.

According to such a push button switch, when the stem 3 is pressed and displaced into the case 1 against the spring force of the spring 4, the bent portion 6b of the movable contact plate 6 is pushed by the inner end of the case 1 of the stem 3. is pressed and displaced toward the fixed contact plate 5 side. As a result, the movable contact plate 6 is bent against its own spring force, the contact protrusion 6a is brought into contact with the contact protrusion 5a, and the push button switch is activated.
It becomes ON state. On the other hand, when the pressing force is released from the stem 3, the stem 3 is returned to its original state by the spring force of the spring 4, and the movable contact plate 6 is returned to its original state by its own spring force, and the push button switch is turned off.

By the way, in such a push button switch, the surfaces of the contact protrusions 5a, 6a become oxidized due to long-term use, and an oxide film is formed on the surfaces. However, in this case, the contact protrusions 5a, 6a
There was a problem in that even if they were brought into contact, the oxide film on their surface acted as resistance, making it impossible to obtain good conduction.

Therefore, this invention constantly cleans the contact area between the movable contact plate and the fixed contact plate, regardless of the length of the period of use, and always maintains a good conduction state when the movable contact plate and the fixed contact plate contact each other. ,
The object of the present invention is to provide a push button switch that can be turned on with a light operating force.

To achieve this purpose, this invention has a rectangular bottom part of the case whose open end is closed with a lid body.
A pair of fixed contact plates for electrical conduction with each other are arranged to extend from one end of the bottom in the longitudinal direction of the bottom, and a stepped portion higher than the fixed contact plates is provided on the other end of the bottom of the case. Contact support grooves extending from the bottom side toward the open end side are formed in the vicinity of the step portions on the inner surfaces of a pair of side walls facing each other in the longitudinal direction of the case, and one end is formed in the case. A movable contact plate is bent into a dogleg shape, with one part supported by the step part, a bent part facing above the pair of fixed contact plates, and the other end extending toward the lid body. At the same time, support protrusions protruding from both sides near one end of the movable contact plate are loosely inserted into each of the contact support grooves, and one end of the movable contact plate is interposed between this and the lid body. A stem is attached to the lid, which is pressed against the stepped portion by a spring, and is capable of pressing the other end of the movable contact plate toward the bottom side, and the pressure of the stem causes the movable contact plate to fold. The bent portion is slid on the pair of fixed contact plates, and when the stem is opened, the spring presses one end of the movable contact plate onto the flat surface of the stepped portion, thereby fixing the bent portion to the pair of fixed contact plates. It is characterized by a push button switch that is spaced apart from the contact plate.

This invention will be explained below based on FIGS. 2 to 11.

In FIGS. 2 to 4, 7 is a case made of synthetic resin, and 8 is a lid made of synthetic resin.

At the upper center of the outer surface of the case 7, there is an inclined guide surface 9.
A locking protrusion 9 having a shape a is provided in a protruding manner as shown in FIG. 2, FIG. 6, and FIG. 7, respectively. Further, on both sides of the lid body 8, locking pieces 1 are provided along the outer surface of the case 7.
0 are respectively protruded in the same direction, and each locking piece 10 is provided with a projection engagement hole 11, respectively. Note that an inclined guide surface 10a is formed at the tip of each locking piece 10. The lid body 8 is removably attached to the upper end of the case 7 by fitting the locking protrusion 9 into the protrusion engagement hole 11, thereby closing the open end of the case 7. ing. In the figure, 12 is a stem insertion hole bored in the lid body 8.

7a and 7b are side walls of the case 7 that face each other. A contact support groove 13 is formed at one end of the inner surface of the side wall 7a, a stem guide groove 14 is formed at the other end of the inner surface of the side wall 7a, and a stem guide groove 14 is formed at one end of the inner surface of the side wall 7b. A contact support groove 13' is formed on the inner side of the side wall 7b, and a stem guide groove 14' is formed on the other end side of the inner surface of the side wall 7b.
The contact support groove 13 and the stem guide groove 14 extend from the bottom 7c side of the case 7 toward the open end side as shown in FIGS. 3 to 6 and 8, and the contact support groove 13' and the stem guide groove 14' also extend Similarly, it extends from the bottom 7c side of the case 7 toward the open end side. The contact support grooves 13, 13' and the stem guide grooves 14, 14' are opposed to each other, and the ends of the contact support grooves 13, 13' on the bottom 7c side are formed in an arc shape.

A substantially semicircular spring receiving step 15 is formed at one end of the bottom 7c of the case 7. Furthermore, a step 16 is formed on the bottom 7c, extending from the center of the spring receiving step 15 to a line O connecting the centers of the contact support grooves 13, 13'. This stepped portion 16 is
As is clear from the figure, it is formed lower than the spring receiving step portion 15, and is also formed in a rectangular shape. Further, fixed contact plates 17 and 18 whose upper surfaces are exposed along both sides inside the case 7 are provided on the bottom 7c of the case 7.
The side part of is buried and fixed. This fixed contact plate 1
7 and 18 have terminal portions 17' and 1 whose one ends are located at the line O and are integral with the fixed contact plates 17 and 18.
8' penetrates the end wall 7d of the case 7 and projects to the outside.

A substantially dogleg-shaped movable contact plate 19 is disposed within the case 7. This movable contact plate 19 has its outer corner facing toward the bottom 7c of the case 7, and support protrusions 19a and 19b are protruded from both sides of one end of the movable contact plate 19, as shown in FIGS. 6 and 9. There is.
The support projections 19a, 19b are inserted into the contact support grooves 13, 13' of the case 7 so as to be rotatable and slidable in the longitudinal direction. Moreover, a protrusion 8a for spring positioning is provided on the inner surface of one end of the lid body 8.
A spring 20 is interposed between the lid body 8 and one end of the spring receiving step 15 and the movable contact plate 19, and one end of which is fitted around the outer periphery of the projection 8a. This spring 20 brings one end of the movable contact plate 19 into light pressure contact with the stepped portion 16. As a result, the other end of the movable contact plate 19 is inclined toward the lid 8. In this state, the height of the upper surface of one end of the movable contact plate 19 and the height of the spring receiving step 15 are substantially the same. In the figure, 21 is a bent portion of the movable contact plate 19, and 22 is a hole bored in the center of the bent portion 21 of the movable contact plate 19. Furthermore, one end portion of the fixed contact plates 18 and 19 mentioned above is
It faces the outer corner side of the bent portion 21 of the movable contact plate 19.

23 is a stem inserted into the stem insertion hole 12. A contact pressing portion 23a extending in a direction perpendicular to the axis of the stem 23 is provided at the lower end of the stem 23. Both side portions of this contact pressing portion 23a are slidably inserted into the stem guide grooves 14, 14'. Furthermore, the contact pressing portion 23a is formed in a semi-cylindrical shape and is in contact with the other end of the movable contact plate 19.

Next, the operation of the push button switch having such a configuration will be explained.

In the state shown in FIG. 3, the movable contact plate 19 is
Due to the action of the spring 20, the contacts are separated from the fixed contact plates 17 and 18 as shown in FIG.
It has become a state. When the stem 23 is pushed down from this state against the spring force of the spring 20, the movable contact plate 19 is first rotated counterclockwise in FIG. The bent portion 21 comes into contact with the fixed contact plates 17 and 18 as shown in FIGS. 4 and 11, and becomes in the ON state.
At this time, the support protrusions 19a and 19b are connected to the contact support groove 1.
3 and 13', but moves slightly toward the lid 8 side.

After this, when the stem 23 is further pushed down, the movable contact plate 19 is rotated about the bent portion 21 as a fulcrum. At this time, the support protrusions 19a, 1
9b cannot move in the width direction of the contact support grooves 13, 13', but moves toward the lid 8 side. As a result, the bending part 2
1 is slid over the upper surfaces of the fixed contact plates 17 and 18 toward the stepped portion 16. At this time, the surfaces of the contact portions of the movable contact plate 19 and the fixed contact plates 17 and 18 are slightly scraped off from each other, so that the contact portions are constantly cleaned and a good conductive state is maintained.

Moreover, the spring force of the spring 20 acts on one end of the movable contact plate 19, and the pressing force of the stem 23 acts on the other end.
Since the distance from the rotational fulcrum (corner 16a, bent portion 21) to the pressing force acting part of the stem 23 is set to be sufficiently larger than the distance from the rotational fulcrum to the spring force acting part, the stem 23 can be made lighter. Even when pressed with force, the movable contact plate 19 can be easily rotated.

This idea was constructed as explained above, so
When the movable contact plate is operated by the stem, the movable contact plate and the fixed contact plate come into sliding contact, and the contact portion is constantly cleaned. As a result, the contact portion between the movable contact plate and the fixed contact plate can be cleaned regardless of the length of the period of use, and the conduction state at this contact portion can be made good. Moreover, it can be turned on with a light operation force.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional push button switch, FIG. 2 is a perspective view of the push button switch according to this invention, FIGS. 3 to 5 are sectional views showing the operating state of the push button switch according to this invention, and FIG. The figures are an exploded perspective view of the push button switch shown in Fig. 2, Fig. 7 is a plan view of the case shown in Fig. 2, and Fig. 8 is a perspective view of the case shown in Fig. 2 cut from the center. Figure 9 shows Figures 3 to 6.
A perspective view of the movable contact plate shown in the figure.
FIG. 11 is an explanatory diagram showing the relationship between the movable contact plate and the fixed contact plate in the state shown in the figure, and FIG. 11 is an explanatory diagram showing the relationship between the movable contact plate and the fixed contact plate in the state shown in FIG. 7...Case, 7a, 7b...Side wall, 7c...
Bottom, 8... Lid, 12... Stem insertion hole, 1
3, 13'...Contact support groove, 16...Step part, 17,
18...Fixed contact plate, 19...Movable contact plate, 19
a, 19b...Support protrusion, 20...Spring,
21...Bending portion, 23...Stem.

Claims (1)

[Scope of utility model registration request] A pair of fixed contact plates for electrical conduction with each other are disposed at the rectangular bottom of the case whose open end is closed with a lid so as to extend from one end of the bottom in the longitudinal direction of the bottom. A step higher than the fixed contact plate is provided on the other end of the bottom, and a step is provided near the step on the inner surfaces of a pair of side walls extending in the longitudinal direction of the case and facing each other, from the bottom to the opening end. Contact support grooves are formed in the case, one end of which is supported by the step, a bent part facing the pair of fixed contact plates, and the other end of which is supported by the lid. A movable contact plate bent into a dogleg shape extending toward the opposite direction is provided, and support protrusions protruding from both sides near one end of the movable contact plate are loosely inserted into each of the contact support grooves, One end of the movable contact plate can be pressed against the stepped portion by a spring interposed between the movable contact plate and the lid, and the other end of the movable contact plate can be pressed against the lid toward the bottom side. A stem is attached, and by pressing the stem, the bent portion of the movable contact plate slides on the pair of fixed contact plates, and when the stem is opened, the spring causes one end of the movable contact plate to slide over the pair of fixed contact plates. A push button switch characterized in that the bent portion is spaced apart from the pair of fixed contact plates by being pressed against a flat surface of the stepped portion.