JP2009043743A - Push-button switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a push-button switch of a normal closing type, downsizing in a simple structure. <P>SOLUTION: Outer peripheral edge parts 4a of a movable contact 4 are mounted on a first and a second fixed contacts 2, 3 so as to conduct between the first and the second fixed contacts 2, 3, and also insulation protrusion parts 1b, 1c are formed on an inner bottom face of a housing part 1a of a housing 1 further on an inner side than the outer peripheral edge parts 4a of the movable contact 4 as well as in the vicinity of the first and/or the second fixed contacts 2, 3. When an expansion part of the movable contact 4 is pressed and turned over, an inner face of the movable contact 4 comes in contact with the protrusion parts 1b, 1c, so that the outer peripheral edge parts 4a are separated from the first and/or the second fixed contacts 2, 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pushbutton switch, and more particularly to the structure of a so-called normally closed type pushbutton switch in which a contact between the contacts is always in a non-operating state.

  The structure of a conventional normally closed type pushbutton switch is to set a large operating force at the time of reversing the movable contact and to apply a high load to the fixed contact in a steady state to ensure electrical contact between the contacts. In addition, a structure in which a thin plate-like return spring for returning a push button to an initial position is combined with a lower surface of a reversible thin plate-like movable contact is known. Thereby, conduction | electrical_connection and separation / contact between the fixed contacts by a movable contact can be performed reliably and stably (for example, patent document 1).

  The structure of this conventional push button switch is shown in FIG. The switch case 1 has a space 10 formed therein, and has a contact accommodating portion 14 in the lower portion thereof, and a pair of fixed contact forming portions 13 are provided to face each other, while a pair of return spring mounting portions 15 are provided. They are formed to face each other. A fixed contact 33 is exposed on one side of the fixed contact forming portion 13, and a protrusion 16 is formed at the center thereof. A fixed contact 34 is exposed on the other side of the fixed contact forming portion 13. Reference numeral 31 denotes a terminal connected to the fixed contact 33, and reference numeral 32 denotes a terminal connected to the fixed contact 34.

  The thin plate-shaped return spring 6 is formed by punching a metal plate having a spring property such as phosphor bronze into a rectangular shape and is slightly curved upward. The thin plate-like return spring 6 is deformed and flattened by the pressing force from the upper side, and returns to its original shape when the pressing force is released. That is, an upward biasing force is always generated.

  Similarly, the thin plate-like movable contact 4 is formed by punching a metal plate having a spring property such as phosphor bronze into a rectangle, two slits 41 are formed in parallel to the longitudinal direction, and edge portions 43 are formed on both left and right sides. In addition, a reversal spring portion 44 is formed between the edge portions 43. One of the short sides of the rectangle is the contact portion 42 of the movable contact 4, and the other short side is the fulcrum piece 46. An opening 47 that engages with the protrusion 16 is provided in the center of the fulcrum side 46. And the downward curved part 45 is formed in the direction orthogonal to a longitudinal direction in both the edge parts 43, and the inversion spring part 44 is in the state deform | transformed slightly upwards.

  When the pressing force is applied to the reversing spring portion 44, the thin plate-like movable contact 4 reverses downward and the contact portion 42 jumps upward and maintains this state. From this state, when a pressing force is applied to the inverted reversing spring portion 44 from the lower side, the reversing spring portion 44 is inverted and deformed upward to return. A concave portion 48 having a projecting portion projecting downward is formed at the center of the thin plate-shaped movable contact 4 so as to press the return spring 6 when a pressing force is applied from above.

  In the pushbutton switch having the above configuration, in a steady state, the contact portion 42 is pressed against the fixed contact 34 by a force opposite to the upward elastic force, and the fixed contact 33 and the fixed contact 34 are in a conductive state (normally closed state). Here, when a push button (not shown) is pressed, the reversing spring portion 44 of the thin plate-shaped movable contact 4 is pushed downward and reversely deformed downward. In this state, the contact portion 42 which is the free end of the thin plate-like movable contact 4 jumps up and the contact with the fixed contact 34 is released.

At this time, the reversing spring portion 44 that has been reversely deformed has the thin plate-like return spring 6 that is always urged upward in the pressed state, and is pressed upward so that the pressing force of the push button is released. The reversing spring portion 44 reverses upward and returns. Thereby, the contact part 42 of the thin plate-like movable contact 4 jumps up, and the contact part 42 and the fixed contact 34 come into contact again to return to the conductive state.
Japanese Patent Laid-Open No. 10-106386

  However, in the structure of the conventional push button switch described above, the shape of the thin plate-like movable contact that is a reversing spring is complicated, and two spring members are required together with the thin plate-like return spring for return. However, there is a problem that the assembly cannot be simplified and the assembly becomes complicated and the size cannot be reduced.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide a push button switch that is simple in configuration and can be miniaturized with a normally closed type push button switch.

  In order to solve the above-mentioned problem, in the present invention, as a first means, a housing having a storage portion, first and second fixed contacts spaced apart from the inner bottom surface of the storage portion, the first And a movable contact disposed on the second fixed contact and formed with a reversible bulging portion, and the movable contact is an outer peripheral edge that simultaneously contacts the first fixed contact and the second fixed contact. And an outer peripheral portion that rises in a conical shape from the outer peripheral edge portion to the bulging portion, and is inside the outer peripheral edge portion of the movable contact and of the first and / or second fixed contacts. An insulating protrusion is formed on the inner bottom surface of the storage part in the vicinity, and when the bulging part of the movable contact is pressed and reversed, the inner surface of the movable contact abuts on the protrusion and the outer peripheral edge The portion is separated from the first and / or second fixed contact.

  As a second means, the movable contact is formed in a circular dome shape, and the protrusion is formed by an arc-shaped wall extending along the inner circumference of the circular dome shape of the movable contact. It is characterized by that.

  As a third means, the movable contact is formed in a circular dome shape, and the protrusion is an annular wall provided continuously along the inner circumference of the movable contact in a circular dome shape. It is formed.

  As a fourth means, the housing is formed of an insulating material, and the protruding portion is formed integrally with the housing.

  As a fifth means, the storage portion is formed with a third fixed contact between the first and second fixed contacts, and the protruding portion is connected to the first or second fixed contact. When the bulging portion of the movable contact is pressed and reversed, the lower surface of the bulging portion of the movable contact comes into contact with the third fixed contact, and the protruding portion It is characterized in that it is electrically connected to one of the first and second fixed contacts that are not formed.

  According to the present invention, it is possible to provide a push button switch having a simple configuration and capable of being miniaturized with a normally closed type push button switch.

  Embodiments of the present invention are shown in FIGS. 1 is a cross-sectional view of the pushbutton switch of the present invention, FIG. 2 is a cross-sectional view of the pushbutton switch in FIG. 1, FIG. 3 is a plan view of the housing, FIG. 4 is a cross-sectional view during operation of FIG. 4, FIG. 6 is a plan view of the housing, FIG. 7 is a cross-sectional view of a pushbutton switch of another embodiment of the present invention, FIG. 8 is a cross-sectional view during operation of FIG. FIG. 10 is a perspective view of the movable contact, and FIG. 11 is a sectional view of the movable contact.

  In FIGS. 1 to 3, the housing 1 is formed in a rectangular box shape with an upper surface having an accommodating portion 1a opened therein by an insulating material such as synthetic resin. On the inner bottom surface of the housing portion 1a of the housing 1, first and second fixed contacts 2 and 3 made of a conductive metal material are arranged in a state of being exposed and opposed to the housing portion 1a. . The exposed portions of the first and second fixed contacts 2 and 3 are provided with protruding contact portions 2a and 3a on which an outer peripheral edge portion 4a of a movable contact 4 described later is placed and abutted. The first and second fixed contacts 2 and 3 are bent and embedded in the inner bottom portion of the housing 1, and the other end side is led out from the side surface portion of the housing 1 and is not shown. Connection terminals 2b and 3b connected to the conductive pattern of the circuit board are provided.

  The housing 1 is integrated with the housing 1 at a position between the first and second fixed contacts 2 and 3 in the vicinity of the first and second fixed contacts. A pair of insulating protrusions 1b and 1c are formed. The projecting portions 1b and 1c are formed by arc-shaped walls extending along the inner periphery of the movable contact 4 formed in a circular dome shape, which will be described later, and the height dimensions of the projecting portions 1b and 1c are as follows. It is formed so as to be slightly lower than the height of the inner surface of the movable contact 4 bulging in a dome shape, which will be described later. The length of the arcuate walls of the protrusions 1b and 1c is the length of the contact portions 2a and 3a provided to protrude from the exposed portions of the first and second fixed contacts 2 and 3, respectively. It is formed so as to be slightly longer.

  The movable contact 4 is made of a conductive thin plate metal plate such as phosphor bronze or stainless steel, and is formed in a circular dome shape having a bulged portion at the center. The first and second fixed contacts 2, 3 An outer peripheral edge 4a that comes into contact with the contact parts 2a and 3a, an outer peripheral part 4b that rises conically from the outer peripheral edge 4a, and a reversing part 4c having a dome-shaped top provided at the center of the outer peripheral part 4b. Is formed. (FIGS. 10 and 11)

  The stem 5 is made of an insulating synthetic resin or the like, and is formed of a bowl-shaped base portion 5a, a pressing portion 5b protruding above the base portion 5a, and an operating protrusion 5c protruding below the base portion 5a. . The stem 5 is accommodated in the accommodating portion 1a of the housing 1, and the movable contact 4 is inverted and switched when the operating protrusion 5c presses the top of the dome-shaped inversion portion 4c of the movable contact 4. Is switched.

  The cover 6 is made of a plate-like metal plate, and is attached to the upper surface side of the housing 1 so as to cover the opening of the storage portion 1a of the housing 1. The stem 5 is prevented from coming off by the upper surface of the base 5 a having a bowl shape of the stem 5 coming into contact with the inner top surface of the cover 6.

  Next, the operation of the pushbutton switch having the above configuration will be described. In the initial state shown in FIG. 1, the outer peripheral edge 4a of the movable contact 4 is connected to the contact 2a of the first and second fixed contacts 2 and 3. 3a, the fixed contacts are in a conductive state, and the circuit is in an on state.

  When the stem 5 is pressed from this state as shown in FIG. 2, the top of the dome-shaped reversing portion 4c of the movable contact is pressed by the operating projection 5c, and the movable contact 4 is reversed. At this time, the inner surface of the dome-shaped reversing portion 4c of the movable contact 4 comes into contact with the arc-shaped protruding portions 1b and 1c provided in the storage portion 1a, and the outer peripheral edge 4a of the movable contact 4 is Since the projecting portions 1b and 1c are rotated as fulcrums, the outer peripheral edge portion 4a is separated from the contact portions 2a and 3a of the first and second fixed contacts 2 and 3. As a result, the first and second fixed contacts 2 and 3 become non-conductive and the circuit is turned off.

  Thus, in the above embodiment, the outer peripheral edge 4a of the movable contact 4 is placed on the first and second fixed contacts 2 and 3, and the first and second fixed contacts 2, 3 is electrically connected, and is insulatively projected on the inner bottom surface of the storage portion 1a inside the outer peripheral edge 4a of the movable contact 4 and in the vicinity of the first and second fixed contacts 2 and 3 1b and 1c are formed, and when the dome-shaped reversing portion 4c of the movable contact 4 is pressed and reversed, the inner surface of the movable contact 4 comes into contact with the projecting portions 1b and 1c and the outer peripheral edge portion 4a is Since the first fixed contact 2 and the second fixed contact 2 are separated from each other, the normally closed type has a simple configuration in which the insulating protrusions 1b and 1c are provided on the inner bottom surface of the storage portion 1a. A push button switch can be configured.

  The movable contact 4 is formed in a circular dome shape, and the protrusions 1b and 1c are formed by arcuate walls extending along the inner circumference of the circular contact dome of the movable contact 4. As a result, there is no directionality when the movable contact 4 is assembled, and assembly is facilitated, and the outer peripheral edge 4a can be reliably separated by the protrusions 1b and 1c.

  Moreover, since the housing 1 is formed of an insulating material and the protrusions 1b and 1c are formed integrally with the housing 1, a normally closed type can be achieved with a simple configuration without increasing the number of parts. It has become.

  In the above embodiment, the arc-shaped protruding portions 1b and 1c provided on the housing 1 are formed in the vicinity of the first and second fixed contacts 2 and 1, respectively. However, separately from this, the projecting portions 1b and 1c may be formed by an annular wall continuous along the inner periphery of the circular dome-shaped reversing portion 4c of the movable contact 4. In this case, since the annular projecting portion comes into contact with the entire inner surface of the reversing portion 4c of the movable contact 4, the circular dome-shaped reversing portion 4c of the movable contact 4 is pressed. When reversing, a stable reversing operation can be obtained.

  FIGS. 4 to 6 show that the protrusion 1c provided in the vicinity of the second fixed contact 3 on one side of the pair of protrusions 1b, 1c provided on the housing 1 is deleted, and the other FIG. 5 shows a modification in which only the protruding portion 1b provided in the vicinity of the first fixed contact 2 on the side is formed.

  As an operation in this case, in the initial state shown in FIG. 4, the outer peripheral edge portion 4 a of the movable contact 4 is in contact with the contact portions 2 a and 3 a of the first and second fixed contacts 2 and 3. Each of the fixed contacts is in a conductive state and the circuit is in an on state.

  From this state, when the stem 5 is pressed as shown in FIG. 5, the top of the dome-shaped reversal portion 4c of the movable contact is pressed by the operating projection 5c, and the movable contact 4 is reversed. At this time, the inner surface of the dome-shaped reversing portion 4c of the movable contact 4 comes into contact with the arc-shaped protruding portion 1b provided in the storage portion 1a, and the movable contact 4 positioned on the protruding portion 1b side. Since the outer peripheral edge 4a is lifted upward with the protrusion 1b as a fulcrum, one end of the outer peripheral edge 4a is separated from the contact 2a of the first fixed contact 2. As a result, the first and second fixed contacts 2 and 3 become non-conductive and the circuit is turned off.

  In this case, the arc-shaped protruding portion 1b formed on the housing 1 is not provided in the vicinity of the first fixed contact 2, but in the vicinity of the second fixed contact 3 on the opposite side. You may make it provide. In this case, the same operation state as the above configuration can be obtained. Also in the configuration of the above-described modified example, the same effect as the above-described embodiment can be obtained.

  7 to 9 show the configuration of another embodiment of the present invention. In this case, the difference from the above embodiment is that a third fixed contact is provided at the center of the inner bottom surface of the housing portion 1a of the housing 1. Is formed. That is, in the present embodiment, the circuit configuration of the switch is different from the configuration of the above-described embodiment, and has a two-contact (double-head) type configuration that can switch the circuit during the operation of the switch. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  7 to 9, first and second fixed contacts 8 and 9 made of a conductive metal material are exposed and opposed to the inner bottom surface of the housing portion 7 a of the housing 7. It is arranged by. At the exposed portions of the first and second fixed contacts 8 and 9, protruding contact portions 8 a and 9 a on which the outer peripheral edge portion 4 a of the movable contact 4 is placed and abutted are provided. Similarly, a third fixed contact 10 made of a conductive metal material is disposed at an intermediate position between the first and second fixed contacts 8 and 9. At the center of the third fixed contact 10, a protruding contact portion 10 a with which the inner surface of the top of the dome-shaped reversing portion 4 c of the movable contact 4 abuts is provided.

  The first, second and third fixed contacts 8, 9, 10 are bent and embedded in the inner bottom portion of the housing 7, and the other end side is outward from the side surface portion of the housing 7. Connection terminals 8b, 9b and 10b are provided which are led out and connected to a conductive pattern of an external circuit board (not shown).

  Further, the housing portion 7 a of the housing 7 is integrated with the housing 7 at a position between the first fixed contact 8 and the third fixed contact 10 in the vicinity of the first fixed contact 8. Insulating protrusions 7b are formed. The projecting portion 7b is formed by an arc-shaped wall extending along the inner periphery of the movable contact 4 formed in a circular dome shape. The height of the projecting portion 7b is the same as that of the movable contact. 4 is formed to be slightly lower than the height of the inner surface bulging into a dome shape. Further, the length of the arcuate wall of the protruding portion 7b is formed to be slightly longer than the length of the contact portion 8a provided to protrude from the exposed portion of the first fixed contact 8. ing.

  Next, the operation of the pushbutton switch having the above configuration will be described. In the initial state shown in FIG. 7, the outer peripheral edge portion 4a of the movable contact 4 is connected to the contact portions 8a of the first and second fixed contacts 8, 9. 9a, and the fixed contacts are in a conductive state and the circuit is in an on state.

  When the stem 5 is pressed from this state as shown in FIG. 8, the top of the dome-shaped reversing portion 4c of the movable contact 4 is pressed by the operating projection 5c, and the movable contact 4 is reversed. At this time, the inner surface of the dome-shaped reversing portion 4c of the movable contact 4 comes into contact with the arc-shaped protruding portion 7b provided in the storage portion 7a, and the outer peripheral edge 4a of the movable contact 4 is Since the protruding portion 7 b is lifted upward with the fulcrum as a fulcrum, one end side of the outer peripheral edge portion 4 a is separated from the contact portion 8 a of the first fixed contact 8. As a result, the first and second fixed contacts 8 and 9 are turned off.

  At this time, when the movable contact 4 is reversed, the inner surface of the top of the dome-shaped reversing portion 4 c of the movable contact 4 abuts on the protruding contact portion 10 a of the third fixed contact 10. Thus, the second fixed contact 9 and the third fixed contact 10 are brought into conduction through the movable contact 4, and the circuit is switched.

  Thus, according to the other embodiment described above, the third fixed contact 10 is formed between the first and second fixed contacts 8, 9 of the housing portion 7 a of the housing 7. By forming the protruding portion 7b in the vicinity of the first fixed contact 8, when the dome-shaped reversing portion 4c of the movable contact 4 is pressed and reversed, the outer peripheral edge portion 4a of the movable contact 4 and The contact portion 8a of the first fixed contact 8 is separated, and the inner surface of the top portion of the reversing portion 4c of the movable contact 4 is in contact with the contact portion 10a of the third fixed contact 10 so that the second fixed contact is performed. Since the contact 9 is made conductive, a two-contact (double-headed) type pushbutton switch capable of switching the circuit during the operation of the switch can be easily configured.

  As described above, the pushbutton switch according to the present invention includes the housing having the storage portion, the first and second fixed contacts spaced apart from the inner bottom surface of the storage portion, and the first and second A movable contact formed on the fixed contact and formed with a reversible bulging portion, and the movable contact includes an outer peripheral edge that simultaneously contacts the first fixed contact and the second fixed contact; An outer peripheral portion that rises in a conical shape from the outer peripheral edge portion to the bulging portion, and is inside the outer peripheral edge portion of the movable contact and in the vicinity of the first and / or second fixed contact. An insulating protrusion is formed on the inner bottom surface of the storage portion, and when the bulging portion of the movable contact is pressed and reversed, the inner surface of the movable contact abuts on the protrusion and the outer peripheral edge portion is Since the first and / or second fixed contacts are separated from each other, the inner bottom surface of the storage portion Can be constructed a push button switch of the normally closed type with only a simple configuration of providing the protruding portion of the edge of, can the configuration of the switch easy, the entire switch can be downsized.

  In addition, the movable contact is formed in a circular dome shape, and the protrusion is formed by an arc-shaped wall extending along the inner circumference of the circular dome shape of the movable contact. The directionality is lost, the assembly is facilitated, and the outer peripheral edge can be reliably separated by the arc-shaped wall.

  In addition, the movable contact is formed in a circular dome shape, and the protrusion is formed by an annular wall provided continuously along the inner periphery of the circular dome shape of the movable contact. Is contacted over the entire circumference of the inner surface of the movable contact, so that a stable reversing operation can be obtained when the bulging portion of the movable contact is pressed and reversed.

  In addition, since the housing is formed of an insulating material and the projecting portion is formed integrally with the housing, the normal close type can be achieved with a simple configuration without increasing the number of parts, so that it is possible to reduce the cost.

  Further, the storage portion is formed with a third fixed contact between the first and second fixed contacts, and a projecting portion is formed only on one of the first and second fixed contacts to be movable. When the bulging portion of the contact is pressed and reversed, the lower surface of the bulging portion of the movable contact comes into contact with the third fixed contact, and the inner portion of the first or second fixed contact in which no protruding portion is formed. Since it is made to conduct with either one, a two-contact (double-headed) type pushbutton switch capable of switching the circuit during the operation of the switch can be easily configured.

It is sectional drawing which shows the pushbutton switch which is embodiment of this invention. It is sectional drawing which shows the state at the time of operation of FIG. 1 of this invention. It is a top view which shows the housing of this invention. It is sectional drawing which shows the pushbutton switch which concerns on the modification of this invention. It is sectional drawing which shows the state at the time of operation of FIG. 4 of this invention. It is a top view which shows the housing of this invention. It is sectional drawing which shows the pushbutton switch which concerns on the other Example of this invention. It is sectional drawing which shows the state at the time of operation of FIG. 7 of this invention. It is a top view which shows the housing of this invention. It is a perspective view which shows the movable contact of this invention. It is sectional drawing which shows the movable contact of this invention. It is a disassembled perspective view which shows the conventional pushbutton switch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 1a Storage part 1b, 1c Projection part 2 1st fixed contact 2a Contact part 2b Connection terminal 3 2nd fixed contact 3a Contact part 3b Connection terminal 4 Movable contact 4a Outer peripheral edge part 4b Outer peripheral part 4c Inversion part (bulging Part)
5 Stem 5a Base 5b Pressing part 5c Actuation protrusion 6 Cover 7 Housing 7a Storage part 7b Projection part 8 First fixed contact 8a Contact part 8b Connection terminal 9 Second fixed contact 9a Contact part 9b Connection terminal 10 Third fixation Contact 10a Contact 10b Connection terminal

Claims (5)

A housing having a storage portion; first and second fixed contacts spaced apart from the inner bottom surface of the storage portion; and a bulge capable of reversing disposed on the first and second fixed contacts. A movable contact formed with a portion,
The movable contact has an outer peripheral edge that simultaneously contacts the first fixed contact and the second fixed contact, and an outer peripheral part that rises in a conical shape from the outer peripheral edge to the bulging part,
An insulative protrusion is formed on the inner bottom surface of the storage portion inside the outer peripheral edge of the movable contact and in the vicinity of the first and / or second fixed contact, When pressed and reversed, the inner surface of the movable contact is in contact with the protruding portion, and the outer peripheral edge is separated from the first and / or second fixed contact. .   2. The movable contact is formed in a circular dome shape, and the protrusion is formed by an arc-shaped wall extending along an inner periphery of the circular dome shape of the movable contact. The pushbutton switch described.   The movable contact is formed in a circular dome shape, and the projecting portion is formed by an annular wall provided continuously along an inner periphery of the movable contact in a circular dome shape. Item 1. A pushbutton switch according to item 1.   2. The pushbutton switch according to claim 1, wherein the housing is formed of an insulating material, and the protrusion is formed integrally with the housing. In the storage portion, a third fixed contact is formed between the first and second fixed contacts, and the projecting portion is formed only on one of the first and second fixed contacts. When the bulging portion of the movable contact is pressed and reversed, the lower surface of the bulging portion of the movable contact comes into contact with the third fixed contact, and the first or the protruding portion is not formed. 2. The pushbutton switch according to claim 1, wherein the pushbutton switch is electrically connected to one of the second fixed contacts.

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