KR100573544B1 - Push button switch - Google Patents

Abstract

(Problem) The present invention provides a pushbutton switch capable of setting a width dimension of a peripheral fixed contact point to be small and ensuring a design freedom of the contact portion including the peripheral fixed contact point.

(Solution means) A movable contact plate 4 comprising a peripheral fixed contact point 2, a central fixed contact point 3, and a metal thin plate which is insert-molded in the housing 1, and having a base part 4a and a tongue piece 4b. ), A rubber spring (5) arranged on the movable contact plate (4) to bring the tongue piece (4b) into contact with the central fixed contact point (3), and a stem (6) for pressurizing the rubber spring (5). At the same time, a convex portion 4c was formed in the shape of forming a part of a sphere in the base portion of the movable contact plate 4 and always in contact with the peripheral fixed contact point 2.

Description

Pushbutton Switches {PUSH BUTTON SWITCH}

1 is a longitudinal cross-sectional view showing one embodiment of a pushbutton switch of the present invention.

FIG. 2 is an enlarged view of a portion A of FIG. 1.

3 is an enlarged view of a portion B of FIG. 1.

It is a top view which shows the movable contact plate with which one Embodiment shown in FIG. 1 is equipped.

5 is an enlarged view taken along line C-C of FIG. 4.

FIG. 6 is a plan view of the embodiment provided in the embodiment illustrated in FIG. 1 and illustrating a housing in which the fixed contact is insert-molded. FIG.

Explanation of symbols for main parts of the drawings

1 housing 2 peripheral fixed contact

3: center fixed contact 4: movable contact plate

4a: base portion 4b: tongue

4c: convex portion 4d: convex portion

4e: convex portion 4f: bend generation portion

5: rubber spring 5a: leg portion

5b: pressurization portion 6: stem

The present invention is equipped with a variety of electronic devices, the push-button switch of the one-point open and close contact type to switch the tongue of the movable contact plate, the base portion is always in contact with the peripheral fixed contact, by contacting the central fixed contact by the pressure of the rubber spring It is about.

As a conventional technique of this kind, there is one disclosed in Japanese Patent Publication No. 2839313. The prior art has a switch case or housing that forms an outer shell, a common fixed contact or peripheral fixed contact having a convex portion, and a central fixed contact disposed in the center of the bottom of the housing. Doing. Peripheral fixed and center fixed contacts are formed in the housing by insert molding.

In addition, the tongue is accommodated in the housing, made of a thin metal plate, the base portion always in contact with the peripheral fixed contact point, and the tongue piece is installed in a cantilever form through the bend generation portion from the base portion, the tongue piece is arranged to be separated from the central fixed contact point A movable contact plate having a is provided.

The dome-shaped spring body, ie, rubber spring, which is housed in the housing, the leg portion is disposed on the above-described base portion of the movable contact plate and is brought into pressing force to contact the tongue piece described above with the central fixed contact, pressurizes the rubber spring. It is provided with a push button that is a stem.

In this prior art, when the stem is pressurized, the rubber spring bends to press the tongue of the movable contact plate, and the tongue contacts the central fixed contact. As a result, the central stationary contact point and the peripheral stationary contact point are turned on through the movable contact plate, and are closed, that is, ON.

When the pressing force applied to the stem is removed, the rubber spring returns to its original shape, and the pressing force applied to the tongue of the movable contact plate is removed, and the tongue is separated from the central fixed contact by the elasticity of the tongue. The peripheral stationary contact is cut off and turned off, i.e., OFF.

The above-mentioned prior art forms a convex part at the peripheral fixed contact point, and makes it possible to ensure stable contact between the peripheral fixed contact point and the base part of the movable contact plate through this convex part.

However, in the above-described prior art, in order to prevent the resin from being coated on the convex portions of the peripheral fixed contact point at the time of insert molding, the convexity of the peripheral fixed contact points in the concave portion is used by using a mold having a concave portion of a shape suitable for the convex portion. It was necessary to insert-form in the state which accommodated the part and brought into contact with peripheral fixed contact parts other than a convex part with a metal mold | die.

Therefore, the width dimension of the peripheral fixed contact must be taken into account as much as the dimension related to the plate thickness of the mold forming the recess. That is, in the prior art, the width dimension of the peripheral fixed contact becomes large. For this reason, there is a problem that the miniaturization of the overall shape is restricted.

Moreover, the position which forms the above-mentioned convex part is limited to a specific position from the arrangement relationship of the peripheral fixed contact in a housing. Moreover, in order to make contact with a movable contact plate more reliable, when forming the convex part of a peripheral fixed contact in many places, the shape of a peripheral fixed contact and the shape of the metal mold | die of the recessed part suitable for a convex part become complicated. Therefore, the number of the convex parts formed in the peripheral fixed contact is also limited. As described above, in the prior art, the degree of freedom in the design of the contact portion including the peripheral fixed contact is limited. For this reason, it is difficult to obtain a high-precision switching performance, which makes it difficult to obtain a highly reliable switch structure.

The present invention has been made in view of the above-described state of the art, and its object is to set the width dimension of the peripheral fixed contact point small, and to secure a large degree of freedom in designing the contact portion including the peripheral fixed contact point. It is to provide a pushbutton switch.

Means to solve the problem

In order to achieve the above object, the present invention includes a housing forming an outer shell, a peripheral fixed contact disposed around the bottom of the housing, and a central fixed contact disposed at the center of the bottom of the housing. In addition, the housing accommodated in the housing, made of a thin metal plate, the base portion is always in contact with the peripheral fixed contact point, and is installed in a cantilever form through the bend generation portion from the base portion, so as to be in contact with the central fixed contact point A movable contact plate having tongues to be arranged is provided. In addition, it is housed in the housing, a leg is mounted on the base of the movable contact plate, a rubber spring for contacting the tongue piece with the central fixed contact under pressure, and is movably mounted in the housing. A stem for pressurizing the spring is provided. Further, the base portion of the movable contact plate is characterized in that a convex portion is formed in contact with the peripheral fixed contact.

According to the present invention configured as described above, the base portion of the movable contact plate can always be in contact with the peripheral fixed contact point through the convex portion formed in the base portion of the movable contact plate. That is, the base part of the movable contact plate and the peripheral stationary contact can be reliably contacted.

Moreover, since the convex part was formed in the base part of the movable contact plate, the peripheral fixed contact can be previously formed in the surface which has no convex part. Therefore, it is not necessary to form the recessed part which accommodates the convex part formed in the peripheral fixed contact in a metal mold | die, and the width dimension of the peripheral fixed contact can be set as small as the dimension related to the plate thickness of the metal mold which forms this recessed part.

In addition, the formation of the convex portion in the base portion of the movable contact plate can be simultaneously formed at the time of press working of the thin metal plate at the time of manufacturing the movable contact plate, so that the production is simple. In addition, this convex portion can be easily formed at a desired position on the base portion of the movable contact plate opposite to the peripheral fixed contact, so that the degree of freedom in designing the contact portion including the peripheral fixed contact can be secured. .

Moreover, this invention set the said convex part in the shape which forms a part of sphere in the said invention, It is characterized by the above-mentioned.

According to the present invention configured as described above, the convex portion can always be point-contacted to the peripheral fixed contact point.

The present invention is characterized in that a plurality of the convex portions are formed in the base portion portion located on the tongue piece side with respect to the bend generation portion of the movable contact plate in the present invention.

According to the present invention configured as described above, when the tongue is pressed by the rubber spring to contact the central fixed contact, a part of the pressing force is transmitted to the portion of the base portion positioned on the tongue side with respect to the bending generation portion of the movable contact plate. The part tends to squeeze into the surrounding fixed contacts. Thereby, sufficient contact pressure can be ensured between the convex part formed in this base part part, and a peripheral fixed contact, and a convex part can be reliably contacted with a peripheral fixed contact.

Moreover, the present invention is characterized in that the uneven portion is formed on one side of the lower surface facing the central fixed contact of the tongue and the central fixed contact in the invention.

According to the present invention configured as described above, even if dust enters between the tongue and the central fixed contact, the dust is retained in the recess in the uneven portion, and the tongue can be reliably contacted with the central fixed contact by the convex portion.

In addition, the present invention is characterized in that the rubber spring has a pressing portion for pressurizing the tongue piece of the movable contact plate, and at the same time, a convex portion that the pressing portion is in contact with the upper surface of the tongue piece is formed.

According to the present invention configured as described above, the convex portion described above formed on the upper surface of the tongue can prevent adhesion of the pressing portion of the rubber spring and the tongue with the pressure of the rubber spring. Moreover, the above-mentioned convex part which a press part can contact can be formed simultaneously at the time of press working of a metal thin plate at the time of manufacturing a movable contact plate.

Embodiment of the invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the pushbutton switch of this invention is described based on drawing.

1-6 is explanatory drawing which shows one Embodiment of this invention, FIG. 1 is a longitudinal cross-sectional view which shows this embodiment, FIG. 2 is an enlarged view of the A part of FIG. 1, FIG. 3 is an enlarged view of the B part of FIG. . 4 is a plan view showing a movable contact plate provided in the present embodiment, FIG. 5 is a C-C cross-sectional enlarged view of FIG. 4, and FIG. 6 is a plan view showing a housing in which the fixed contact is insert-molded.

As shown in FIG. 1, the present embodiment is arranged around the bottom of the housing 1, which forms an outer shell, the peripheral fixed contact 2, which is a common fixed contact, and the housing 1. The center fixed contact point 3 is arrange | positioned at the center of the bottom part of this. The peripheral stationary contact 2 and the center stationary contact 3 are insert-molded in the housing 1, as shown also in FIG. The upper surface of the peripheral fixed contact point 2 is previously formed into the flat surface which does not have a convex part.

In addition, as shown in FIG. 1, the base part 4a, which is housed in the housing 1, is made of a metal thin plate, and is always in contact with the peripheral fixed contact point 2, and the bending generation part (from the base part 4a) It is provided in a cantilever form through 4f), and is provided with the movable contact plate 4 which has the tongue piece 4b arrange | positioned so that contacting separation with the center fixed contact point 3 is possible.

The housing 1 on the upper side of the movable contact plate 4 is provided with a rubber spring 5 which receives the pressing force to contact the tongue piece 4b with the central fixed contact point 3. The leg portion 5a of the rubber spring 5 is mounted on the base portion 4a of the movable contact plate 4. In the central portion of the rubber spring 5, a pressing portion 5b for pressing the tongue piece 4b of the movable contact plate 4 to contact the central fixed contact 3 is formed.

Furthermore, it is provided with the stem 6 which is movably attached to the housing 1, and pressurizes the rubber spring 5. As shown in FIG.

In particular, in the present embodiment, as shown in FIG. 2 in which the portion A of FIG. 1 is enlarged, a part of a convex portion, for example, a sphere, which contacts the peripheral fixed contact point 2 on the lower surface of the base portion 4a of the movable contact plate 4 The convex part 4c set to the shape which forms the form is formed. This convex portion 4c is always in point contact with the peripheral fixed contact point 2.

As shown in FIG. 4, the above-mentioned convex part 4c has a some number, for example, 4 in the part of the base part 4a which is located in the tongue piece 4b side with respect to the bending generation part 4f of the movable contact plate 4. As shown in FIG. Dogs are formed. Two of these four convex parts 4c are located on the imaginary line which passes through the substantially center of the transverse direction of the movable contact plate 4, for example, and the other two are located in the vicinity of the front-end | tip part of the tongue piece 4b. All or part of these convex portions 4c is always in point contact with the peripheral fixed contact point 2.

Moreover, as shown in FIG. 3, FIG. 4, and FIG. 5 which expanded B part of FIG. 1 also in the lower surface of the tongue piece 4b of the movable contact plate 4, the convex part 4c of the base part 4a mentioned above. ), For example, three convex portions 4d having the same shape are formed. These convex portions 4d are positioned at equal intervals, for example, so as to surround the central portion of the tongue piece 4b. All or part of these convex parts 4d is able to make point contact with the center stationary contact point 3.

By forming the three convex parts 4d mentioned above, the uneven part is formed in the lower surface of the tongue piece 4b of the movable contact plate 4 which opposes the center fixed contact 3. That is, the convex part in the uneven part is three convex parts 4d, and the concave part in the uneven part is a space part including the lower surface of the tongue piece 4b formed around the convex part 4d.

In addition, as shown in Figs. 3 and 4, the convex part which the press part 5b can contact with the upper surface of the tongue piece 4b of the movable contact plate 4 which opposes the press part 5b of the rubber spring 5 is shown. (4e) is formed. The convex part 4e formed in the upper surface of this tongue piece 4b is also set in the same shape as the convex part 4d formed in the lower surface of the tongue piece 4b, for example, and is located in the center part of the tongue piece 4b.

In this embodiment configured as described above, the base portion 4a of the movable contact plate 4 is surrounded by the elasticity of the leg portion 5a of the rubber spring 5 housed so as to be regulated by the stem 6 in the housing 1. It is always pressed against the stationary contact 2. In other words, all or part of the four convex portions 4c formed on the lower surface of the base portion 4a is kept in point contact with the peripheral fixed contact point 2 at all times.

When the stem 6 is pressurized in this state, the rubber spring 5 bends and the pressurized portion 5b is formed through the convex portion 4e formed on the upper surface of the tongue 4b of the movable contact plate 4. Press 4b. All or part of the three convex portions 4d formed on the lower surface of the tongue piece 4b is in point contact with the central fixed contact. As a result, the central stationary contact 3 and the peripheral stationary contact 2 are conducted through the movable contact plate 4, and the lungs, that is, on are turned on.

Moreover, when the pressing force applied to the stem 6 in the state mentioned above is removed, the rubber spring 5 will return to original shape, and the pressing force applied to the tongue piece 4b of the movable contact plate 4 will be removed. . Thereby, the tongue piece 4b, ie, the convex portion 4d of the tongue piece 4b, is moved away from the central stationary contact point 3 by the elasticity of the tongue piece 4b and thus the central stationary contact point 3 and the peripheral stationary contact point 2 Is cut off and the dog is turned off.

As described above, in the present embodiment configured as described above, the convex portion 4c formed on the lower surface of the base portion 4a of the movable contact plate 4 can always be in point contact with the peripheral fixed contact point 2. That is, the base part 4a of the movable contact plate 4 and the peripheral fixed contact 2 can be made to contact reliably.

Moreover, when the tongue piece 4b is pressed by the rubber spring 5 so that it may contact the center stationary contact point 3, a part of the pressing force will be pressed against the bend generation part 4f of the movable contact plate 4, and the tongue piece 4b. It is transmitted to the part of the base part 4a located in the side), and this part of the base part 4a tends to be pressed by the peripheral fixed contact point 2. In this embodiment, since the four convex parts 4c are formed so that it may be located in the part of the base part 4a pressed by the peripheral fixed contact point 2 at this time, even when this tongue piece 4b is pressed, the convex part 4c ) Can be surely brought into contact with the peripheral fixed contact point (2).

Moreover, even if dust enters between the lower surface of the tongue piece 4b of the movable contact plate 4 and the center stationary contact point 3, such a dust will be three convex parts 4d formed in the lower surface of the tongue piece 4b. In the space around it. That is, even when dust enters, the tongue piece 4b and the center stationary contact point 3 can be reliably contacted by the convex part 4d.

As described above, in the present embodiment, the base portion 4a of the movable contact plate 4 and the peripheral fixed contact point 2 are formed by the convex portion 4c formed on the lower surface of the base portion 4a of the movable contact plate 4. ) Can always be reliably brought into contact with each other, and the tongue 4b and the central fixed contact 3 can be reliably brought into contact by the convex portion 4d formed on the lower surface of the tongue 4b.

In this embodiment, since the convex portion 4c is formed in the base portion 4a of the movable contact plate 4, as described above, the upper surface of the peripheral fixed contact point 2 is a flat surface having no convex portion. It can be formed in advance. Therefore, when insert-molding the peripheral fixed contact point 2 and the central fixed contact point 3 into the housing 1, it is not necessary to form a recess in the mold to accommodate the convex portions formed at the peripheral fixed contact point 2, The width dimension of the peripheral fixed contact point 2 can be made small by the dimension related to the plate thickness of the metal mold | die which forms a recessed part. As a result, miniaturization of the overall shape can be realized.

In addition, in this embodiment, the convex part 4c in the base part 4a of the movable contact plate 4 is a thin metal plate at the time of manufacturing the movable contact plate 4 which has the base part 4a and the tongue piece 4b. It can be formed at the same time during press working, so the production is simple. Moreover, the convex part 4c can be easily formed in a desired position of the base part 4a of the movable contact plate 4 by a desired number. Thereby, the freedom degree of the design of the contact part containing the peripheral fixed contact point 2 can be ensured large. Therefore, as described above, highly accurate switching performance can be ensured and a highly reliable switch structure can be obtained.

Moreover, in this embodiment, attachment of the press part 5b and tongue tongue 4b of this rubber spring 5 by the pressurization of the rubber spring 5 by the convex part 4e formed in the upper surface of tongue tongue 4b. This can help to secure a highly reliable switch structure. Moreover, both the convex part 4e formed in the upper surface of the tongue piece 4b, and the convex part 4d formed in the lower surface of the tongue piece 4b mentioned above are both presses of the thin metal plate at the time of manufacturing the movable contact plate 4; At the time of processing, it can form easily.

In addition, since the convex part 4e was formed in the upper surface of the tongue piece 4b as mentioned above, the pressurization of the rubber spring 5 by the deformation | transformation of the rubber spring 5 at the time of pressurization of the rubber spring 5 was carried out. When the center of the portion 5b and the position of the convex portion 4e do not coincide, the pressing portion 5b is inclined, and a part of the pressing portion 5b tends to be strongly pressed against the tongue 4b. Therefore, the convex part 4d in which the one part of the press part 5b is close to the position which is strongly pressed against the tongue piece 4b will be in the state which contacts the center stationary contact point 3 with a big contact pressure. As a result, the corresponding convex portion 4d can be brought into point contact with the central fixed contact point 3 with a strong force, and the tongue piece 4b and the central fixed contact point 3 can be brought into contact with each other more reliably. Contributes to securing performance.

In addition, in this embodiment, since the uneven | corrugated part is formed in the lower surface of the tongue piece 4b by the three convex part 4d formed in the lower surface of the tongue piece 4b as mentioned above, the tongue piece 4 and center part Contact defects due to dust between the fixed contacts 3 can be prevented, contributing to the securing of highly accurate switching performance.

Moreover, in the said embodiment, although the uneven part is formed in the lower surface of the tongue piece 4b by forming three convex parts 4d in the lower surface of the tongue piece 4b of the movable contact plate 4, this uneven part is a tongue piece 4b. It may be formed on the upper surface of the center fixed contact 3 instead of forming on the lower surface of Even if it is comprised in this way, the dust infiltrating between tongue tongue 4b and center fixed contact point 3 can be hold | maintained in the recessed part in an uneven part, and the tongue piece 4b and center fixed contact point are made by the convex part in uneven part. (3) can be contacted reliably.

Moreover, in the said embodiment, since the convex part is not formed in the peripheral fixed contact point 2, the width dimension of the peripheral fixed contact point 2 can be set small, and the whole shape can be miniaturized by this. However, in the case where the overall shape is the same as in the prior art, since the width dimension of the peripheral fixed contact point 2 can be set smaller, the central fixed contact point 3 can be set larger than the conventional one. In such a configuration, a large contact area between the tongue piece 4b and the center stationary contact point 3 of the movable contact plate 4 can be ensured so that the tongue piece 4b and the center stationary contact point 3 can be contacted more reliably. have.

As described above, in the present invention, since the convex portion which contacts the peripheral fixed contact is formed in the base portion of the movable contact plate, the width dimension of the peripheral fixed contact can be set small, whereby the overall shape can be reduced in size. .

In addition, the convex portion can be formed at the same time when the movable contact plate is manufactured, so that the production is simple and the degree of freedom in designing the contact portion including the peripheral fixed contact can be secured. As a result, the contact between the movable contact plate and the peripheral stationary contact can be reliably performed, a high accuracy switching performance can be ensured, and a switch structure with higher reliability can be obtained.

In addition, this invention sets the convex part mentioned above in the shape which forms a part of sphere. Thereby, the convex part is always point-contacted to the peripheral fixed contact point, and the base part of the movable contact plate and the peripheral fixed contact point are reliably contacted, contributing to ensuring the high precision switching performance.

Moreover, in this invention, the said convex part is formed in multiple numbers in the base part part located in the tongue piece side with respect to the bending generation part of the said movable contact plate. Thereby, even at the time of the pressurizing operation of the rubber spring, sufficient contact pressure of the convex part with respect to the surrounding fixed contact point can be obtained, and it contributes to ensuring the high precision switching performance.

Moreover, this invention forms the uneven part in the lower surface which opposes the center fixed contact of the tongue piece mentioned above, and either side of a center fixed contact. As a result, even if dust enters between the tongue and the central fixed contact, the dust is retained in the concave portion of the uneven portion, and the tongue and the central fixed contact can be reliably contacted by the convex portion of the uneven portion. In other words, it is possible to prevent contact failure due to dust between the tongue piece and the center stationary contact, contributing to the securing of high-precision switching performance.

The present invention also provides a convex portion in which the rubber spring has a pressing portion for pressurizing the tongue of the movable contact plate, and at the same time, the pressing portion is in contact with the upper surface of the tongue. The convex portion prevents the rubber spring from being pressed against the tongue and adheres to the tongue, thereby contributing to securing a highly reliable switch structure.

Claims (5)

A housing forming an outer shell, a peripheral fixed contact disposed around the bottom of the housing, a central fixed contact disposed at the center of the bottom of the housing, and a metal thin plate housed in the housing, the peripheral fixed A movable contact plate having a base part which is in constant contact with the contact point, and a tongue piece which is installed in a cantilever shape through the bend generating part from the base part, and which is arranged to be in contact with the central fixed contact point; A push is mounted on the base portion of the movable contact plate, and includes a rubber spring for receiving the pressing force to contact the tongue with the central fixed contact point, and a movably mounted to the housing, the stem being pressurized to operate the rubber spring. In the button switch, And a convex portion in the base portion of the movable contact plate, the convex portion being always in pressure contact with the peripheral fixed contact point by the elasticity of the leg portion of the rubber spring. The pushbutton switch according to claim 1, wherein the convex portion is set in a shape that forms part of a sphere. The pushbutton switch according to claim 1, wherein a plurality of the convex portions are formed in the base portion portion positioned on the tongue piece side with respect to the bending generation portion of the movable contact plate. The pushbutton switch according to claim 1, wherein an uneven portion is formed on a lower surface of the tongue piece facing the central fixed contact and on one side of the central fixed contact. The pushbutton switch according to claim 1, wherein the rubber spring has a pressing portion for pressing and manipulating the tongue of the movable contact plate, and a convex portion in which the pressing portion is in contact with the upper surface of the tongue.

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