JPH07176238A - Push button switch - Google Patents

Abstract

PURPOSE:To improve the touch of operation by generating a click feeling at operating time. CONSTITUTION:A reset spring 56 for forwardly energizing a push button 50 is provided. A nearly heart-shaped cam groove 55 is formed in a pusher 51 connected to the push button 50. A lever 53, placed almost in a fixed position in a vertical direction and arranged movably along the cam groove 55 in a surface orthogonal to the vertical direction, is provided. A spring material 100 for pressing the lever 53 to a side of the pusher 51 is provided. By one backward press operation of the push button 50 against the reset spring, the lever 53 moves almost half round the periphery in the cam groove 55, to hold the pusher 51 respectively in a position where a movable contact 38 is brought into contact with a fixed contact 36 and in a position where the movable contact 38 is separated from the fixed contact 36. The lever 53 is elastically pressed to a stepped groove bottom of the cam groove 55 by the spring material 100, to generate a click feeling at operating time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push button switch mainly used for driving an emergency bell or the like by a push operation in an emergency.

[0002]

2. Description of the Related Art In the course of reaching the present invention, the applicant has filed Japanese Patent Application No. 5-170648 as a push button switch that can be operated by a so-called push-on-push-off operation. Japanese Patent Application No. 5-170648 discloses a prior application in which a fixed contact whose contact portion is fixed at a fixed position and a movable contact facing the front of the fixed contact are provided at the tip end to separate the movable contact from the fixed contact. A return spring for biasing the push button in the forward direction is provided, which is composed of a movable contact plate that is biased by a spring, and is connected to the push button to transmit the pushing force to the push button to the movable contact plate. A substantially heart-shaped cam groove is formed on the rear end side of the pusher, and a lever that is arranged at a substantially fixed position in the front-rear direction and is movable along the cam groove in a plane orthogonal to the front-rear direction. Provided, each time the push button is pushed backward once against the spring force of the return spring, the lever moves around the cam groove approximately halfway and separates the movable contact from the position where the movable contact contacts the fixed contact. So as to hold the presser at each position Those were. Here, the lever is pressed against the groove bottom of the cam groove by the elastic force of the material forming the lever.

[0003]

In the above configuration,
Since it is pressed against the groove bottom of the cam groove only by the elastic force of the material of the lever, the pressing force to the groove bottom of the cam groove may be weak due to manufacturing errors, assembly errors, etc. There is a problem that when you move along the shape of the cam groove, the feeling of clicking when riding over the stairs formed at the bottom of the cam groove is poor, and the operation feeling is poor, and when the pressing force is weak, it turns on and off. There is also a problem in that the certainty of the switching of is also lacking.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a click feeling at the time of operation and a good operation feeling, and to switch between an on state and an off state. Is to provide a push button switch that can be reliably operated.

[0005]

In order to solve the above problems and achieve the object of the present invention, a push button switch according to the present invention has a fixed contact whose contact portion is fixed at a fixed position and a front portion of the fixed contact. A movable contact plate which is provided with a movable contact facing the front end and which is biased by a spring in a direction to separate the movable contact from the fixed contact, and a return spring for biasing the push button in the forward direction is provided and is connected to the push button. A substantially heart-shaped cam groove whose front end is the rear end side of the pusher is formed on the side surface of the pusher that transmits the pushing force to the movable contact plate. A lever that is movably arranged along the cam groove is provided in the orthogonal plane, and a spring member for pressing the lever toward the pusher side is provided, and the push button moves backward against the spring force of the return spring. Each time you push the It is characterized in that formed by holding the push rod, respectively the position and the movable contact contacting the contact with the fixed contact at each position of a position away from the fixed contact.

Further, it is preferable that the spring material for pressing the lever toward the pusher is made of synthetic resin. In addition, a push button that moves forward and backward by a pressing operation is arranged on the front surface of the case so that the push button is exposed, and the case is attached to the construction material by inserting the rear portion into a circular mounting hole formed in the construction material. The case is held in an inner frame that is detachably attached to the opening window formed in the center of the circular plate frame, and the case has a size that is twice the unit size of the standard embedded wiring device. It is also preferable that it is set.

[0007]

According to the present invention, since the spring member for pressing the lever to the pusher side is provided, the spring member reliably and strongly elastically moves the lever to the bottom of the heart-shaped cam groove of the pusher. When the lever leg piece gets over the stairs at the bottom of the heart-shaped cam groove during operation, a click feeling occurs.

If the spring material for pressing the lever toward the pusher is made of synthetic resin, it has arc resistance. In addition, a push button that moves forward and backward by a pressing operation is arranged on the front surface of the case so that the push button is exposed, and the case is attached to the construction material by inserting the rear portion into a circular mounting hole formed in the construction material. The case is held in an inner frame that is detachably attached to the opening window formed in the center of the circular plate frame, and the case has a size that is twice the unit size of the standard embedded wiring device. If it is set, it can be easily installed by forming a circular mounting hole in the construction material,
The case is formed in a size twice as large as the unit size of the wiring device, and the case can be easily attached to the inner frame.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 shows the overall configuration. A terminal portion to which an external electric wire is connected, a contact portion for opening and closing an external circuit connected to the terminal portion, an opening / closing mechanism portion for opening and closing the contact portion, and the like are provided in a case formed by connecting the body 10 and the cover 20. Delivered. A front surface of the body 10 to which the cover 20 is coupled is opened, and assembly pieces 11 are provided at four corners of the surface of the body 10 facing the cover 20. Each assembly piece 11 has a hooking hole 11a penetrating forward and backward. Has been formed. Assembling claws 2 projecting from the rear surface of the cover 20 in each hooking hole 11a.
1 is inserted and a hooking protrusion 2 provided at the tip of the assembling claw 21.
The body 10 and the cover 20 are integrally coupled by locking 1a to the peripheral edge of the hook hole 11a.

The case formed by connecting the body 10 and the cover 20 should be mounted on a mounting frame for three large squares, which is standardized for embedded wiring equipment by JIS etc., up to a maximum of three. It is formed to have a size corresponding to two cases of the wiring equipment case having a unit size (referred to as two module size).
Further, each side surface of the cover 20 is provided with two pairs of mounting claws 20a projectingly engageable with the holding holes provided in the mounting frame. That is, both side pieces 72 of a middle frame 70 (see FIG. 5), which will be described later,
By engaging the mounting claw 20a with 74, the middle frame 70
You can attach the case to.

The body 10 is formed as shown in FIGS. 6 to 9, and the inner space of the body 10 has partition walls 12a and 12b.
It is partitioned into a terminal storage chamber 13a and a contact storage chamber 13b by. The partition 12a has a substantially U-shaped horizontal cross section,
A space surrounded by the partition wall 12a and the inner peripheral surface of the peripheral wall of the body 10 is defined as a terminal storage chamber 13a. Four terminal accommodating chambers 13a are provided, and a substantially U-shaped screw window 14 that opens toward the front edge of the peripheral wall of the body 10 is formed on the peripheral wall of the body 10 in each terminal accommodating chamber 13a.

In each terminal accommodating chamber 13a, a part of the terminal plates 31, 32 is arranged so as to be substantially parallel to the inner peripheral surface of the peripheral wall of the body 10. Two terminal plates 31 and 32 are provided. One end of each terminal plate 31, 32 is inserted into a holding groove 15a formed on one leg of the partition wall 12a, and the terminal plate 31, 32 is inserted through a holding slit 15b formed on the other leg of the partition wall 12a. The other end is pulled out to the contact storage chamber 13b. The holding grooves 15a are formed in the portions of the terminal plates 31 and 32 that are housed in the terminal housing chamber 13a.
U-shaped mounting groove 3 that is opened to face one edge inserted into the
3 is formed. Further, the terminal screws 35, into which the square nuts 34 are screwed, are held on the terminal plates 31 and 32 in such a manner that a portion between the head of the terminal screw 35 and the square nuts 34 is inserted into the mounting groove 33. . On the rear wall of the body 10, a wire insertion port 1
Two terminals 6 are opened for each terminal storage chamber 13a. When connecting the external electric wire introduced into the body 10 through the electric wire insertion port 16 to the terminal plates 31 and 32, the terminal screw 35 is loosened before the external electric wire is introduced, and the terminal screw 35 is inserted after the external electric wire is introduced. Tighten to connect the external wire to the terminal board 3
It is sandwiched between 1, 32 and the square nut 34.

A part of the above-mentioned terminal board 31 is the contact storage chamber 1
3b and is disposed substantially parallel to the inner peripheral surface of the rear wall of the body 10, and as shown in FIG. 19, a fixed contact 36 is fixed to the tip portion thereof. In addition, a part of the terminal plate 32 is introduced into the contact storage chamber 13b and is arranged substantially parallel to the inner peripheral surface of the rear wall of the body 10, and as shown in FIG. One end of the movable contact plate 37 made of a leaf spring is fixed. A movable contact 38 facing the fixed contact 36 is fixed to the other end of the movable contact plate 37.
Is set in front of the fixed contact 36, and the movable contact plate 37 has a spring force in a direction to separate the movable contact 38 from the fixed contact 36. Further, both movable contact plates 37 are arranged substantially parallel to each other,
The positional relationship is set so that the directions from the terminal plate 32 toward the movable contact 38 are opposite to each other. That is,
Both movable contact plates 37 are arranged in a point-symmetrical positional relationship with respect to the center of the rear wall of the body 10. The partition wall 12b described above is
Since the movable contact plates 37 are formed so as to be partitioned from each other, the contact storage chamber 13b is divided into two chambers by the partition wall 12b.

As described above, the external electric wire is connected to the terminal board 31,
By separating the terminal storage chamber 13a connected to 32 and the contact storage chamber 13b in which the fixed contact 36 and the movable contact 38 are stored by the partition wall 12a, the screw window 1
The partition wall 12 prevents dust and the like from entering the inside of the body 10 from a portion that is open to the outside such as the wire 4 and the wire insertion port 16.
It can be blocked by a, and it is possible to prevent contact failure due to foreign matter such as dust adhering between the fixed contact 36 and the movable contact 38. Further, a convex rib 18 is provided so as to project forward on a part of the partition wall 12a between the adjacent terminal plates 31 and 32, and the convex rib 18 is engaged with a positioning groove 41 provided in an inner cover 40 described later. By doing so, it is possible to prevent water droplets or the like from entering the inside of the body 10.

In the opening portion on the front surface of the body 10, FIG.
The inner cover 40 having the shape shown in FIGS.
The inner cover 40 is a window 14 for screws in the peripheral wall of the body 10.
Front surface and partition walls 12a, 12b in which parts are formed
Is attached to the body 10 so as to abut the front surface of the. Here, the body 10 and the inner cover 40 are connected to the terminal plates 31, 32.
Since it surrounds the conductive parts such as the movable contact plate 37 and the movable contact plate 37, it is formed of a thermosetting synthetic resin, and the other synthetic resin molding members are formed of a thermoplastic synthetic resin. That is, the middle cover 40 functions as a partition that separates the terminal portion and the contact portion from the mechanism portion described later. On the peripheral edge of the inner cover 40 along the peripheral wall where the screw window 14 is formed in the body 10, a projecting wall 42 is projectingly provided on the front surface side, and the outer surface of the projecting wall 42 is substantially flush with the peripheral wall outer peripheral surface of the body 10. Become one Also,
The remaining peripheral edge of the inner cover 40 is formed along the inner peripheral surface of the peripheral wall of the body 10. Retaining ribs 43 are formed at the four corners of the inner cover 40 and are continuous with both ends of the projecting wall 42 and project outward from the outer surface of the projecting wall 42. A mounting recess 43a that is open to the front is formed at the front end of the holding rib 43. A provisional fixing projection 44 protruding in the longitudinal direction of the projecting wall 42 is provided on the peripheral edge of the inner cover 40 so as to come into pressure contact with the inner peripheral surface of the body 10 in the vicinity of the assembly piece 11 provided on the body 10. Temporary fixing protrusions 44 are formed at four locations to temporarily fix the inner cover 40 to the body 10.

The terminal cover 30 is mounted in the mounting recess 43a of the holding rib 43. The terminal cover 30 has a substantially L-shaped cross section.
1 and has mounting recesses 43 on both side edges of the horizontal piece in FIG.
A mounting protrusion 30a mounted on a is provided in a protruding manner. Further, a thin hinge portion 30b is formed in the middle portion of the vertical piece, and the screw window 14 provided in the body 10 can be opened and closed by bending and extending through the hinge portion 30b. Furthermore, the rear end of the vertical piece of the terminal cover 30 (see FIG.
Locking protrusions 30c are provided on both side edges of the lower end portion of the body 10. The locking protrusions 30c are provided on the rear surface of the body 10 with the screw windows 14 closed by the terminal cover 30.
(See FIG. 8).

As shown in FIGS. 12 and 13, a positioning groove 41 for engaging the convex rib 18 provided on the body 10 is formed on the rear surface side of the inner cover 40, and is inserted into the body 10. Positioning protrusions 45 and 46 for holding the terminal plates 31 and 32 are provided in a protruding manner. The positioning protrusion 45 engages with the notch 31a (see FIG. 19) provided in the terminal plate 31 to position the terminal plate 31 with respect to the inner cover 40 (see FIG. 32), and the positioning protrusion 46 serves as the rear wall of the body 10. The terminal plate 32 is positioned with respect to the inner cover 40 by sandwiching the terminal plate 32 with the inner peripheral surface. Therefore, the fixed contact 36 due to the movement of the movable contact plate 37 provided on the terminal plate 32.
During the opening / closing operation of the movable contact 38 and the movable contact 38, the fixed contact 36 and the movable contact 38 are not displaced in position, and the opening / closing operation is stable.

At the center of the inner cover 40, an insertion hole 4 through which a pusher 51 for transmitting the operating force of the push operation of the push button 50 held by the cover 20 to the intermediate portion of the movable contact plate 37 is inserted.
7 is formed. The pusher 51 opens and closes the fixed contact 36 and the movable contact 38 by transmitting an operating force to the movable contact plate 37. That is, the cover 20 is formed in the shape shown in FIGS.
A circular push button housing recess 22 is provided in the center of the front surface, and four push button sliding holes 23 are formed at equal intervals on the peripheral portion of the bottom wall of the push button housing recess 22 in the circumferential direction. A pusher sliding hole 24 is formed at the center of the bottom wall of the push button housing recess 22. A part of the peripheral wall of the push button housing recess 22 is formed by an annular guide rib 25 protruding rearward from the back surface of the cover 20. Further, the rear end surface of the guide rib 25 is located in front of the bottom surface of the push button housing recess 22 and serves as a locking surface 25a. On the bottom surface of the push button housing recess 22 between the adjacent push button sliding holes 23, a locking projection 23a is provided so as to project forward.

By the way, the pusher sliding hole 24 is formed in a rectangular shape, and fixing plate holding ribs 24a are provided on the rear surfaces of both side edges.
Is projected. Each of the fixing plate holding ribs 24a is formed with a holding groove 24b running in the front-rear direction, which is opened so as to face each side edge of the pusher sliding hole 24 and has a front end face opened. Both sides of the fixed plate 52 inserted from the front are held in the holding groove 24b. As shown in FIG. 21, the fixing plate 52 is formed in a rectangular shape, has fixing notches 52a formed at the rear portions of both side edges, and locking projections 52b protruding at the front portions of both side edges.
On both side edges of the fixed plate 52, inclined edges 52c are formed so as to be rearward of the fixing notch 52a and be inclined so that the distance between them becomes smaller toward the rear. Therefore, the fixed plate 52 is inserted into the holding groove 24b so that the inclined edge 52c is fixed to the fixed plate holding rib 2.
When the rear end portion of the fixing plate 52a is crossed over, the rear end portion of the fixing plate holding rib 24a fits into the fixing notch 52a, and the forward and backward movement of the fixing plate 52 is prohibited. At this time, the locking projection 5
2b contacts the bottom surface of the push button housing recess 22. Fixed plate 52
A lever holding projecting piece 52d is projectingly provided at the front end of the lever holding projecting piece 52d. .

The above-mentioned fixed plate 52 holds a lever 53 formed in a substantially U shape, one leg of the lever 53 is inserted into the fulcrum hole 52e, and the other leg is rocking hole. 52f is inserted. Therefore, the lever 53 can swing about the fulcrum hole 52e within the width of the swing hole 52f. The lever 53, while being held by the fixed plate 52, is inserted into the lever notch 24 c formed in the peripheral edge of the pusher sliding hole 24.

Each leg piece of the lever 53 held by the fixed plate 52 has a slide groove 54 and a cam groove 5 formed on one surface of the pusher 51 formed in the shape shown in FIGS. 22 to 26.
5 and 5, respectively. The slide groove 54 is formed so as to run in the front-rear direction, and the fulcrum hole 52 of the fixed plate 52 is formed.
One leg piece of the lever 53 inserted through e is inserted.

The cam groove 55 is formed in a substantially heart shape, and the other leg of the lever 53 is inserted therein. That is, as shown in FIG. 27, the cam groove 55 is provided with a substantially heart-shaped guide protrusion 55a at the center and a groove 55b is formed around the guide protrusion 55a, and the groove bottom of the groove 55b is It has a staircase shape and is divided into 6 regions depending on the depth. Areas a to f in FIG. 27 are area a and area e.
Is deepest, and the depth is set so that a = e>d>f>c> b. Further, the center position of the convex portion at the rear end of the outer peripheral surface of the guide protrusion 55a is displaced to the left side in FIG. 27 with respect to the center position of the convex portion at the rear end of the peripheral surface surrounding the outside of the guide groove 55b. The center position of the concave portion at the front end portion of the outer peripheral surface of the protrusion 55a is displaced leftward with respect to the center position of the concave portion at the front end portion of the peripheral surface surrounding the outside of the guide groove 55b. Therefore, assuming that one leg of the lever 53 is inserted into the cam groove 55, the pusher 51 is spring-biased forward, and the leg is initially located in the area a. As the pusher 51 moves back and forth, the leg piece of the lever 53 moves counterclockwise in the cam groove 55.

More specifically, when the pusher 51 is moved rearward, the leg piece of the lever 53 is guided by the guide projection 5.
The rear end portion of 5a comes into contact with the right slope, and as a result, it is guided from the area a to the area b, and it goes over the area b to reach the area c. Here, when the pusher 51 is moved forward, the leg piece of the lever 53 is guided to the area d by the step between the area c and the area b, and the guide protrusion 55
The leg piece of the lever 53 falls into the concave portion of the front end portion of a and is held at this position by the biasing force acting on the pusher 51. Next, when the pusher 51 is moved backward, the lever 53
Of the guide groove 55b is brought into contact with the left side slope at the front end portion of the guide groove 55b and guided to the area e. When the pusher 51 is moved forward, the leg piece of the lever 53 is guided to the area a and moved to its original position. Return to. As described above, the leg piece of the lever 53 moves counterclockwise in FIG. 27 in the guide groove 55b due to the forward and backward movement of the pusher 51.

Here, in the present invention, the spring member 100 for pressing the lever 53 toward the pusher 51 is provided. As shown in FIG. 2, the spring material 100 is attached to a spring support portion 101 provided on the rear surface side of the cover 20, and in the embodiment shown in the accompanying drawings, as shown in FIGS. Configured. Of course, it is not limited to the torsion spring. By thus providing the spring member 100 and pressing the lever 53 toward the pusher 51, even if there is a manufacturing error in the lever 53 or the cam groove 55,
The other leg of the lever 53 is always pressed against the groove bottom of the heart-shaped cam groove 55, and as a result, when the leg of the lever 53 crosses the stairs of the groove bottom of the heart-shaped cam groove 55 during operation. A click sensation is generated, and the click sensation is felt as a tactile sensation, which improves operability. Further, it is possible to prevent an arc or the like that forms the spring material 100 with a synthetic resin.

At the rear end portion of the pusher 51, a pair of card pieces 51a are formed in a bifurcated shape so as to straddle the partition wall 12b and contact the movable contact plates 37, respectively. Further, a pair of push button connecting protrusions 51b is provided at the front end of the pusher 51, and connecting claws 51c are provided at the front end of each push button connecting protrusion 51b so as to approach each other. Connection protrusion 5
A push button 50 housed in the push button housing recess 22 is connected to 1.

The push button 50 is formed in the shape shown in FIGS. 28 to 31, and is formed in a bottomed cylindrical shape with the front surface closed and the rear surface open, and the push button 50 is formed at the center of the inner bottom surface. A connecting protrusion 50a is provided so as to be connected to the connecting protrusion 51b. The connecting projection 50a is provided at its rear end with a claw portion 50b which bulges to the left and right, and the claw portion 50b serves as a push button connecting projection 5
The push button 50 and the pusher 51 are connected by being inserted between 1b and engaging with the connecting claw 51c.

The peripheral wall of the push button 50 has four guide pieces 50c formed at equal intervals in the circumferential direction and adjacent guide pieces 50.
It is formed by two hooking pieces 50d formed between c. The hooking piece 50d has a locking claw 50e protruding outward at a rear end portion thereof and is inserted into the push button sliding hole 23. The locking claw 50e is the locking surface 25 that is the rear end surface of the guide rib 25.
When the push button 50 is moved rearward, the forward movement of the push button 50 is restricted by being locked by a.
The rearward movement of the push button 50 is restricted by the rear end surface of the guide piece 50c contacting the locking projection 23a. In this way, the push button 50 moves forward and backward with respect to the cover 20 between the position where the forward movement is restricted and the position where the backward movement is restricted. Further, since the guide piece 50c and the hooking piece 50d are in sliding contact with the inner peripheral surface of the guide rib 25 in the range where the push button 50 moves forward and backward, rattling of the push button 50 with respect to the cover 20 is prevented.

By the way, spring seat protrusions 50f are provided at four locations on the peripheral portion of the inner bottom surface of the push button 50. One end on the large diameter side of a return spring 56, which is a conical spring, contacts the spring seat protrusion 50f. The other end of the return spring 56 on the small diameter side is in contact with the bottom surface of the push button housing recess 22 at the peripheral portion of the pusher insertion hole 23, and the return spring 56 urges the push button 50 forward. . Further, since the return spring 56 is a conical spring, a substantially constant return force can be obtained regardless of the amount of pushing of the push button 50, and the operation feeling is good.

When manufacturing the push-button switch having the above-mentioned structure, for the body 10, the terminal plates 31 and 32 to which the terminal screws 35 with which the nuts 34 are screwed are attached are mounted in the body 10, and the inner cover 40 is attached. Cover the body 10. Further, the terminal cover 30 is attached to the inner cover 40. As for the cover 20, the fixing plate 52 is provided in the holding groove 24b.
Then, the leg pieces of the lever 53 are inserted into the slide groove 54 and the cam groove 55 of the presser 51 through the fulcrum hole 52e and the swing hole 52f of the fixed plate 52, respectively. afterwards,
The return spring 56 is housed in the push button housing recess 22 of the cover 20, and the push button 50 is fitted into the push button housing recess 22. At this time, the connection protrusion 50a of the push button 50 engages with the push button connection protrusion 51b of the pusher 51, the push button 50 and the pusher 51 are coupled, and at the same time, the return spring 56 is provided between the push button 50 and the cover 20. Retained. Cover 2 with each part assembled in this way
The push button switch can be assembled by covering the body 10 with the inner cover 40 and the terminal cover 30 with 0 and engaging the assembly claw 21 with the assembly piece 11. Here, since the cover 20 is formed of the thermoplastic synthetic resin, the assembly claw 21 can have sufficient flexibility. Since the push button 50 is also made of a thermoplastic synthetic resin, simply by storing the push button 50 in the push button storing recess 22, the hooking piece 50d is bent to engage the locking claw 50e with the locking surface 25a of the guide rib 25. It can be stopped. Further, since all the assembling directions of the respective parts can be from the front, the automation of the assembly using the assembly machine becomes easy.

Next, the operation will be described. As shown in FIG. 33, when the front surface of the push button 50 is substantially flush with the front surface of the cover 20, the spring force of the return spring 56 acts so that the leg piece on the rear side of the lever 53 has the cam groove 55. It is kept in a state of falling into the area a. In this state, the hook piece 5 of the push button 50
The forward movement of the push button 50 is regulated by the engagement claw 50e provided at the rear end portion of 0d contacting the engagement surface 25a which is the rear end surface of the guide rib 25. At this time, in the movement range of the pusher 51, the rear end of the pusher 51 is the body 10
Since the movable contact plate 37 is farthest from the bottom surface, the movable contact plate 37 is in a state in which the movable contact 38 is separated from the fixed contact 36.

In the above state, when the push button 50 is pushed into the cover 20 and then the push button 50 is released, the leg piece on the rear side of the lever 53 is moved by the spring force of the return spring 56 to the area d of the cam groove 55.
The return spring 56 is compressed at this time, and the card piece 5 provided at the rear end of the pusher 51 is retained.
1a approaches the bottom surface of the body 10 and pushes the movable contact plate 37 backward to bring the movable contact 38 and the fixed contact 36 into contact with each other. That is, the push button 50 is held at a position retracted from the front surface of the cover 20, and the movable contact 38 and the fixed contact 36 come into contact with each other at this time.

On the other hand, when the contact portion is closed,
When the push button 50 is pressed, as shown in FIG. 34, the leg piece on the rear side of the lever 53 moves to the area e of the cam groove 55, and when the pressing force on the push button 50 is released in this state, the return spring 56 is released.
The lever 53 moves to the area a of the cam groove 55 by the spring force of and returns to the state of FIG. After all, Fig. 36
As in (a) to (d), if the push button 50 is pressed once, the fixed contact 36 and the movable contact 38 can be brought into contact with each other to be kept on, and if the push button 50 is pressed again, it can be turned off. Therefore, it is possible to provide a push-on-push-off type push button switch.

The push button switch having the above structure is attached to a circular mounting hole formed in a building material such as a wall panel by a plate set having a shape shown in FIG. The plate set includes a circular plate frame 60 having an opening window 61 in the center, a middle frame 70 detachably mounted on the plate frame 60, and a metal fireproof panel 80 mounted on the front surface of the plate frame 60. , A decorative plate 90 arranged on the front side of the fireproof panel 80.

Mounting legs 62 having a substantially U-shaped cross section are integrally projected on both sides of the rear surface of the plate frame 60, and both mounting legs 62 are inserted into the mounting holes formed in the building material. Plate frame 60
An insertion hole 63 is formed at a portion corresponding to the mounting leg 62, and a mounting screw 64 is inserted into the insertion hole 63 from the front side of the plate frame 60. A rotation stopper 64a made of synthetic resin is attached to the base of the mounting screw 64, and a sandwiching metal fitting 65 is screwed onto the tip of the mounting screw 64. A notch portion 62a is formed at the rear end portion of the mounting leg 62 so that the tip end portion of the sandwich metal piece 65 can be projected in the circumferential direction of the outer peripheral edge of the plate frame 60.
The peripheral portion of the portion of the sandwiching metal fitting 65 that is screwed into the mounting screw 64 is formed so as to fit in the mounting leg 62. That is, when the mounting screw 64 is tightened in a state where the tip end of the clip metal fitting 65 is projected from the cutout portion 62 a, the clip metal fitting 65 initially rotates together with the mounting screw 64, and the clamp metal fitting 65 is rotated.
From the time when the side surface of the plate contacts the mounting leg 62 and the rotation of the sandwiching bracket 65 stops, the sandwiching bracket 65 is guided by the mounting leg 62 as the mounting screw 64 is tightened, and the plate frame 6
It moves so that it approaches zero. With this configuration, the construction material can be sandwiched between the peripheral portion of the plate frame 60 and the sandwich metal fitting 65, and the plate frame 60 can be fixed to the construction material. The plate frame 60 is also formed with a pair of fixing holes 66 at different positions from the insertion holes 63 for inserting screws that are screwed into the construction material.

The middle frame 70 is detachably mounted in the opening window 61 of the plate frame 60. Engaging claws 71 are integrally projected at the four corners of the middle frame 70 to form the plate frame 60. The engagement notch 67 with which the engagement claw 71 engages is provided inside the opening window 61 of
Are formed. Therefore, when the middle frame 70 is inserted into the opening window 61 of the plate frame 60 from the front, the middle frame 70 is detachably attached to the plate frame 60 by the engagement claw 71 engaging the engagement notch 67. Will be done.

The push button switch described above is detachably mounted inside the middle frame 70. An elastic piece is provided on one side piece 72 of the middle frame 70, and the elastic piece has a holding claw (not shown) that engages with a mounting claw 20a provided on the case of the push button switch.
Are formed. A holding hole 73 is formed in the other side piece of the middle frame 70 that faces the elastic piece, and a mounting claw 20a protruding from the side surface of the case of the push button switch is provided in the holding hole 7.
Engage 3. That is, the push button switch has the mounting claw 20a.
Are attached to the middle frame 70 by engaging the middle frame 70, and two pairs of holding claws and holding holes 73 are provided. When removing the push button switch from the inner frame 70, the elastic piece may be bent outward by the tip of a tool such as a screwdriver.

The fireproof panel 80 is provided with a projecting part 81 projecting forward in the center part, and a window hole 82 for exposing the push button switch is punched in the central part of the projecting part 81. The window hole 82 is set to a size twice the module size. A hole portion 83 for exposing the head portion of the mounting screw 64 and a notch portion 84 for exposing the head portion of the screw inserted into the fixing hole 66 are formed in the peripheral portion of the fireproof panel 80. .
Further, a claw portion 85 that is inserted into a positioning hole 68 formed in the plate frame 60 is provided on the periphery of the fireproof panel 80 so as to project. Here, in order to prevent the refractory panel 80 from falling off the plate frame 60, the holes 83 and the cutouts 8 are formed.
4, the mounting screw 64 or the fixing hole 6 respectively
Pressing pieces 86 and 87, which are sandwiched between the head portion of the screw inserted into the plate 6 and the plate frame 60, are provided in a protruding manner.

The outer diameter of the decorative plate 90 is the plate frame 6
An opening 9 is formed in the shape of a disk whose rear surface is open and which substantially corresponds to the outer diameter of 0, and which exposes the front surface of the push button switch in the center.
1 is formed. The opening 91 is formed to have substantially the same size as the window hole 82 of the fireproof panel 80. The decorative plate 90 is arranged on the front side of the fireproof panel 80, and the peripheral portion of the decorative plate 90 is fitted on the peripheral portion of the plate frame 60.
An elastic coupling piece 92 is projectingly provided on the back surface of the decorative plate 90, and the coupling piece 92 is engaged with the coupling hole 69 of the plate frame 60 through a through hole 88 formed in the protruding portion 81 of the fireproof panel 80. By doing so, the decorative plate 90 is detachably coupled to the plate frame 60.

As described above, the push button switch is the middle frame 70.
It is attached to the plate frame 60 via the
5 shows a state in which the push button is attached to the plate set.
Since the middle frame 70 of the plate set has a holding claw and a holding hole 73 so as to be able to hold a standard embedded wiring device, an outlet or a switch having another structure is provided. It is possible to use other wiring device mounting devices such as, and there is no need to manufacture new mounting devices. Also, since the mounting device is shared with other wiring equipment, the appearance can be unified with other wiring equipment,
There is also the advantage that it looks good.

[0040]

As described above, according to the present invention, the tip end is provided on the side surface of the pusher that is connected to the push button provided with the return spring for biasing forward and transmits the pushing force to the movable contact plate to the movable contact plate. A substantially heart-shaped cam groove on the rear end side of the pusher is formed, and a lever is provided that is substantially fixed in the front-rear direction and is movable along the cam groove in a plane orthogonal to the front-rear direction. Each time the push button is pushed backwards once against the spring force of the return spring, the lever moves approximately half way around the cam groove to bring the movable contact into contact with the fixed contact and the position where the movable contact is separated from the fixed contact. Since the pusher is held at each position of and, it is possible to reverse the on / off state of the contact portion each time the push button is pressed once, and so-called push-on-push-off operation becomes possible. Yes, for example, by pressing a push button, an emergency bell, etc. The restoration work after being actuated, it is only the push button again press operation, in which recovery work is facilitated as compared with the conventional configuration. Moreover, like this,
In the push-on / push-off operation type, a spring material for pressing the lever to the pusher side is provided, so even if a manufacturing error or an assembly error occurs in the lever or cam groove, the lever can be reliably operated. The leg pieces of will be elastically and reliably pressed against the groove bottom of the heart-shaped cam groove, and as a result, there will be a click feeling during operation and the operation feel will be good, and there will be no manufacturing or assembly errors. However, it is possible to reliably switch between the on state and the off state.

When the spring material for pressing the lever toward the pusher is made of synthetic resin, it has arc resistance. In addition, a push button that moves forward and backward by a pressing operation is arranged on the front surface of the case so that the push button is exposed, and the case is attached to the construction material by inserting the rear portion into a circular mounting hole formed in the construction material. The case is held in an inner frame that is detachably attached to the opening window formed in the center of the circular plate frame, and the case has a size that is twice the unit size of the standard embedded wiring device. If it is set, it can be easily installed by forming a circular mounting hole in the construction material,
The case is formed to have a size twice as large as the unit size of the wiring device, and is attached by engaging the mounting claws with the inner frame. The case is easily attached to the inner frame. be able to.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a rear view showing a state in which a pusher, a fixing plate, and a spring member are incorporated in the same cover.

FIG. 4 is an enlarged rear view of the main part of the above.

FIG. 5 is an exploded perspective view showing a relationship with the above plate set.

FIG. 6 is a front view of a body used in the above.

FIG. 7 is a cross-sectional view taken along line XX in FIG. 6 of the body used for the above.

FIG. 8 is a rear view of the body used in the above.

9 is a sectional view of the body used in the above, taken along line YY in FIG.

FIG. 10 is a front view of an inner cover used for the above.

FIG. 11 is an inner cover used in the same as X- in FIG.
It is an X-ray sectional view.

FIG. 12 is a sectional view of an inner cover used in the above.

FIG. 13 is a rear view of the inner cover used in the above.

FIG. 14 is a front view of a cover used in the above.

FIG. 15 is a cross-sectional view of a cover used in the above.

FIG. 16 is a rear view of the cover used in the above.

FIG. 17 is a side view of the cover used in the above.

FIG. 18 is a vertical sectional view of a cover used in the above.

FIG. 19 shows one terminal plate used in the same as above, (a) is a front view and (b) is a side view.

FIG. 20 shows the other terminal plate used in the above, wherein (a) is a front view and (b) is a side view.

FIG. 21 shows a fixing plate used in the same as above, (a) is a front view and (b) is a side view.

FIG. 22 is a front view showing a pusher used in the above.

FIG. 23 is a side view showing a pusher used in the above.

FIG. 24 is a rear view showing a pusher used in the above.

FIG. 25 is a plan view showing a pusher used in the above.

FIG. 26 is a bottom view showing the pusher used in the above.

FIG. 27 is a front view of a main part of a presser used in the above.

FIG. 28 is a front view of a push button used in the above.

FIG. 29 is a vertical sectional view of a push button used in the above.

FIG. 30 is a rear view of the push button used in the above.

FIG. 31 is a cross-sectional view of a push button used in the above.

FIG. 32 is a partially cutaway front view showing a state in which the push button of the same is removed.

FIG. 33 is an explanatory diagram of the operation of the above.

FIG. 34 is an explanatory diagram of the operation of the above.

FIG. 35 shows the state of attachment to the above plate set,
(A) is a front view, (b) is a side view, and (c) is a bottom view.

FIG. 36 is a diagram showing an operation of the above.

[Explanation of symbols]

 31 terminal plate 32 terminal plate 36 fixed contact 37 movable contact plate 38 movable contact 50 push button 51 pusher 53 lever 55 cam groove 56 return spring 100 spring material

Claims (3)

[Claims] 1. A fixed contact, a contact portion of which is fixed in a fixed position, and a movable contact plate which is provided with a movable contact facing the front of the fixed contact at a tip portion thereof and is biased by a spring in a direction of separating the movable contact from the fixed contact. Is provided with a return spring that biases the push button forward, and the tip of the pusher is connected to the push button and transmits the pushing force to the push button to the movable contact plate. A heart-shaped cam groove is formed, and a lever is provided that is substantially fixed in the front-rear direction and is movable along the cam groove in a plane orthogonal to the front-rear direction. A spring material for pressing is provided, and each time the push button is pushed backward once against the spring force of the return spring, the lever makes approximately half a turn in the cam groove and the movable contact contacts the fixed contact. Press the movable contact at each position where it separates from the fixed contact. A push button switch characterized by holding a child. 2. The push button switch according to claim 1, wherein the spring material for pressing the lever toward the pusher is made of synthetic resin. 3. A construction material in which a push button that moves forward and backward by a pressing operation is arranged on the front surface of the case so as to be exposed, and the case is formed by inserting a rear portion into a circular mounting hole formed in the construction material. A circular plate frame is attached to a central frame of a circular plate frame that is detachably attached to the inner frame, and the case is twice the unit size of a standard embedded wiring device. The push button switch according to claim 1, wherein the push button switch is set to have the following dimensions.