JP3351864B2 - Push button switch - Google Patents

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 pressing operation in an emergency.

[0002]

2. Description of the Related Art Conventionally, as a push button switch of this kind operated in an emergency, a switch attached to a square mounting hole formed in a building material is mainly used. As shown in FIG.
It has a shape in which a square push button set 101 is attached to a square plate set 100. Push button set 1
01 is detachable with respect to the plate set 100, and when the push button 102 provided on the push button set 101 is pressed in a state where the push button set 101 is attached to the plate set 100, the pusher 103 is pushed in and the contact portion is pressed. Is configured to be turned on.

[0003] Therefore, as shown in FIG.
If the contact portion is to be turned off after the user presses the button 02, the push button set 101 is removed from the plate set 100 as shown in FIG. 34B, and then the pusher 103 is pulled back as shown in FIG. Push button 1 of push button set 101
02 is also returned to its original state, and as shown in FIG.
1 will be remounted.

[0004]

In the above configuration, since the plate set 100 is formed in a rectangular shape, a rectangular mounting hole must be formed in the erection material when the plate set 100 is attached to the erection material. However, there is a problem that it takes time to construct. Further, when the emergency bell or the like is stopped, it is necessary to remove the push button set 101 from the plate set 100, and there is a problem that it takes time to perform a recovery operation in case of an erroneous operation due to mischief or the like.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, so that it can be attached to a circular mounting hole to facilitate construction work and to be restored when used to operate an emergency bell or the like. It is an object of the present invention to provide a push button switch that allows easy operation.

[0006]

[Summary of the invention of claim 1, in order to achieve the above object, is attached to the building material in the form of the rear part is inserted into the circular mounting hole formed in the building material Help A decorative plate including a case held by a middle frame detachably attached to an opening window formed at the center of the rate frame, and a front surface of the case held by the middle frame is attached to a front surface of the plate frame; A push button switch exposed from an opening formed at the center of the body, the body being open at the front, and being attached to the front side of the body.
Cover and the space surrounded by the body and cover.
The case is formed by the inner cover partitioning between the D side and the cover side.
Configured to open and close the external circuit and the terminal for connecting the external circuit
Contact point is located in the space surrounded by the body and the inner cover.
The push button that moves forward and backward by the push operation is exposed on the front of the cover , and the contact section opens in conjunction with the push operation of the push button.
The closing mechanism is in the space surrounded by the cover and the inner cover.
Housed, in a side surface of the to case attachment claw coupling is projected to standardized mounting frame for wiring accessories, case middle frame uneven engagement with preparative Tsuketsume is relative middle frame is Held , contact point
Is a fixed contact fixed in place and a
Movable contact from fixed contact with opposing movable contact at the tip
From the movable contact plate that is spring-biased so that
Connected to the push button to transmit the pressing force to the push button to the movable contact plate
The presser that is to be inserted is
A pair of push button connecting projections are protruded from the front end, and the rear surface of the push button
On the side, the push button connecting protrusion is inserted between both push button connecting protrusions
It is characterized in that a connecting projection which engages with the projection is provided in a protruding manner.

[0007]

[0008]

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a return spring for urging the push button forward, and the pusher has a substantially heart-shaped side having a front end located on a rear end side of the pusher. A cam groove is formed, and a lever, which is substantially fixed in the front-rear direction and movably disposed along the cam groove in a plane orthogonal to the front-rear direction, is held by the cover, and the push button is pressed by the spring force of the return spring. Each time the lever is pressed backward once, the lever makes approximately half a revolution in the cam groove, and the pusher is held at each of the position where the movable contact contacts the fixed contact and the position where the movable contact is separated from the fixed contact. It is characterized by comprising.

According to a third aspect of the present invention, in the first aspect of the present invention, a partition is formed in the body to partition a terminal storage chamber for storing the terminal portion and a contact storage chamber for storing the contact portion. And According to a fourth aspect of the present invention, in the third aspect of the present invention, the terminal portion includes a terminal plate partially housed in the terminal storage room, and the other portion of the terminal plate is extended to the contact storage room and fixed to the extended portion. A contact or a movable contact plate is fixed, and a notch portion is formed at a key portion of the terminal plate on which the fixed contact is provided so as to engage with a positioning projection protruding from a rear surface of the inner cover.

According to a fifth aspect of the present invention , in the first aspect of the present invention, the terminal portion has a terminal plate partially parallel to the inner peripheral surface of the peripheral wall of the body and a terminal plate parallel to the inner peripheral surface of the peripheral wall of the body in the terminal plate. A terminal screw is inserted into the part, a head is exposed from a screw window opened in the peripheral wall of the body, and a terminal nut is screwed into a screw portion with a square nut for holding an external electric wire between the terminal wire and the terminal plate. An electric wire insertion hole to be introduced between the plate and the square nut is perforated in a rear wall of the body, and a thickness of the rear wall of the body around the electric wire insertion hole is larger than other portions.

According to a sixth aspect of the present invention, in the first aspect of the present invention, a push button storage recess having an inner shape substantially corresponding to the outer shape of the push button is provided on the front surface of the cover, and the push button is accommodated therein. A cover is provided on the cover with a locking surface that abuts a locking claw that protrudes outward on the periphery of the push button at a front end position in a range of forward and backward movement, and a locking protrusion that abuts a rear end surface of the push button at a rear end position. It is characterized by comprising.

According to a seventh aspect of the present invention, in the invention of the sixth aspect, the push button is formed in a bottomed cylindrical shape having a front surface closed and a rear surface opened, and a peripheral wall of the push button is formed on an inner peripheral surface of the push button storage recess. It is characterized in that it comprises a guide piece that slides and a hook piece provided separately from the guide piece, and a locking claw protrudes outward from the tip of the hook piece. According to an eighth aspect of the present invention, in the invention of the seventh aspect, a spring seat projection to which one end of a return spring made of a conical spring abuts is protruded from a peripheral portion of an inner bottom surface of the push button.

According to a ninth aspect of the present invention, in the first aspect of the present invention, a hooking projection provided at a rear end of an assembly claw projecting rearward from the cover is provided on a peripheral edge of a hooking hole formed in a peripheral portion of the body. By combining, the body and the cover are combined.

[0015]

According to the structure of the first aspect, the case is held by the inner frame, and the inner frame is attached to the plate frame attached to the erection material with the rear part inserted into the circular mounting hole formed in the erection material. It is attached, and it can be easily attached to the construction material by forming a circular attachment hole. Moreover, the case is attached by engaging the mounting claws with the middle frame, and the case can be easily attached to the middle frame.

Further , the case is formed by connecting the body and the cover, and the inner space between the body and the cover is partitioned by the inner cover, and the inner space is surrounded by the body and the inner cover. Accommodates the contact portion and the terminal portion, and accommodates the mechanism portion in a space surrounded by the cover and the inner cover, so that the conductive portion can be separated from other portions. That is, dust from the portion of the push button exposed to the outside of the case to the conductive portion Ru can be prevented from entering.

In addition, a pusher for transmitting the pressing force from the push button to the movable contact plate provided at the contact portion is provided, and a push button connecting projection provided at the front end of the pusher and a connection provided at the rear side of the push button. The pusher and the pushbutton are connected by engaging the projection, so that the pushbutton and the pusher can be integrally linked, and the work of connecting the pushbutton and the pusher is facilitated. .

According to the second aspect of the present invention, since the push button is biased forward by the return spring, the pusher integrally connected to the push button is also biased forward. In addition, a substantially heart-shaped cam groove whose tip is the rear end side of the pusher is formed on the side surface of the pusher, and a part of the lever held by the cover is inserted into the cam groove. Each time the lever is pushed backward once against the spring force of the return spring, the lever makes approximately half a revolution in the cam groove, and the movable contact contacts the fixed contact and the movable contact is separated from the fixed contact. Since the pushers are held at the respective positions, each time the push button is pressed once, the ON / OFF of the contact portion can be reversed, so that a so-called push-on / push-off operation becomes possible. That is, in the recovery operation after the push button is pressed and the emergency bell or the like is operated, it is only necessary to press the push button again, and the recovery operation becomes easier as compared with the conventional configuration.

According to the third aspect of the present invention, since the partition for separating the terminal storage chamber for storing the terminal portion and the contact storage chamber for storing the contact portion is formed in the body, the external electric wire is introduced into the body. The entry of dust from the site to the contact portion can be prevented by the partition wall. According to the configuration of the fourth aspect, the notch portion that engages with the positioning projection protruding from the rear surface of the inner cover is formed at a key point of the terminal plate provided with the fixed contact, and the terminal plate is formed in the body. And the inner cover is attached to the body, the rattling of the terminal plate can be prevented by the engagement between the notch and the positioning projection.

According to the fifth aspect of the present invention, since the thickness of the rear wall of the body at the peripheral portion of the wire insertion port is larger than other portions, the wire insertion port can be formed relatively deep and the external wire can be formed. Can be securely held by the electric wire insertion port, so that even if the external electric wire is bent, the external electric wire is hardly dropped from the body. According to the configuration of claim 6 , the push button is housed in the push button storage recess formed on the front surface of the cover so as to be movable back and forth, and the protrusion protrudes from the periphery of the push button at the front end position in the range of the forward and backward movement of the push button. Since the cover has the locking surface that comes into contact with the claw and the locking projection that comes into contact with the rear end surface of the push button at the rear end position, the movement range of the push button can be restricted.

According to the configuration of claim 7, a portion of the peripheral wall of the push button and catching piece, there than engaging pawl outwardly is projected on the tip portion of the catching piece, the configuration of claim 6 Can be formed at the tip of the hooking piece. Claim 8
According to the configuration, since the spring seat protrusion that one end of the return spring made of a conical spring abuts on the periphery of the inner bottom surface of the push button, the return spring can be positioned with respect to the push button. Variations in the operating force of the push button can be prevented. In addition, since the return spring is a conical spring, the return force is substantially constant irrespective of the pushing amount of the push button, and the operational feeling is improved.

According to the ninth aspect of the present invention, the engaging projection provided at the rear end of the assembly claw projecting rearward from the cover is engaged with the peripheral edge of the engaging hole formed in the peripheral portion of the body. Since the cover and the cover are connected, the body and the cover can be connected easily, and the assembling work is facilitated.

[0023]

FIG. 2 shows the overall configuration. The body 1 includes 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 and closing mechanism for opening and closing the contact portion.
It is housed in a case formed by combining the cover 0 and the cover 20. The body 10 has an opening at the front surface to which the cover 20 is connected, and at the four corners of the body 10 facing the cover 20, assembling pieces 11 are extended, and each assembling piece 11 has a hook hole 11 a penetrating back and forth. Is formed. An assembly claw 21 protruding from the rear surface of the cover 20 is inserted into each of the hook holes 11a, and a hook projection 21a provided at a tip end portion of the assembly claw 21 is engaged with a peripheral edge of the hook hole 11a so that the body 10 is connected to the body. The cover 20 is integrally connected. That is, body 1
In order to join the cover 0 and the cover 20, the position of the assembly claw 21 is aligned with the hook hole 11a, and the cover 20 is pressed against the body 10. They can be easily combined without application.

The case formed by combining the body 10 and the cover 20 is attached to a mounting frame for three large squares standardized for embedded wiring equipment according to JIS or the like up to three cases. It is formed in a size (called two module size) for two wiring device cases of unit dimensions that can be made.
On each side surface of the cover 20, two pairs of mounting claws 20a that can be engaged with the holding holes formed in the mounting frame are provided. That is, both side pieces 72 of a middle frame 70 (see FIG. 1) described later,
The engagement of the mounting claws 20a with the
Can be attached to the case.

The body 10 is formed as shown in FIGS. 3 to 6, and the internal space of the body 10 is formed by partition walls 12a and 12b.
Thus, the terminal storage chamber 13a and the contact storage chamber 13b are partitioned. The partition 12a has a substantially U-shaped horizontal 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 storage chambers 13a are provided, and a substantially U-shaped screw window 14 that opens to the front edge of the peripheral wall of the body 10 is formed on the peripheral wall of the body 10 in each terminal storage chamber 13a.

In each of the terminal storage chambers 13a, a part of each of the terminal plates 31, 32 is disposed so as to be substantially parallel to the inner peripheral surface of the peripheral wall of the body 10. Two terminal plates 31, 32 are provided. One end of each of the terminal plates 31 and 32 is inserted into a holding groove 15a formed in one leg of the partition 12a, and passes through a holding slit 15b formed in the other leg of the partition 12a. The other end is drawn out to the contact storage chamber 13b. In the terminal boards 31 and 32, the portions housed in the terminal housing chamber 13 a are provided with holding grooves 15 a.
U-shaped mounting groove 3 opening toward one edge inserted into the
3 is formed. A terminal screw 35 having a square nut 34 screwed thereto is held by the terminal plates 31 and 32 in a manner that a portion between the head of the terminal screw 35 and the square nut 34 is inserted into the mounting groove 33. . The rear wall of the body 10 has an electric wire insertion port 1
6, two openings are provided for each terminal storage chamber 13a. When connecting the external electric wires introduced into the body 10 through the electric wire insertion port 16 to the terminal plates 31 and 32, the terminal screws 35 are loosened before the introduction of the external electric wires, and the terminal screws 35 are introduced after the introduction of the external electric wires. And connect the external wires to the terminal board 3
It is clamped between 1, 32 and the square nut 34.

As shown in FIGS. 4 and 6, the periphery of the wire insertion port 16 is formed so as to protrude forward by a dimension h from the other portion of the inner peripheral surface of the rear wall of the body 10. Therefore, the thickness of the rear wall of the body 10 is larger than other portions. The wire insertion port 16 has a small diameter portion 16a near the inside of the body 10 and a small diameter portion 16a near the outside of the body 10.
It is formed in a shape having a large diameter portion 16b having a diameter larger than a. When the external electric wire whose end is stripped of the insulation coating is inserted into the electric wire insertion slot 16, the core wire of the external electric wire is
a, the end surface of the insulating coating of the external electric wire abuts on the boundary between the large diameter portion 16b and the small diameter portion 16a. However, the large diameter portion 16b can be formed deep by increasing the thickness of the rear wall of the body 10 in the peripheral portion of the wire insertion port 16, and as a result, the external electric wire can be inserted into the large diameter portion 16b. When the bending force acts on the external wire introduced into the wire insertion port 16 due to the increase in the amount,
6 can be prevented from falling off. As shown in FIG. 5, a gauge groove 17 for measuring a desired exposure amount of the core wire of the external electric wire is formed on the rear surface of the body 10.

A part of the terminal plate 31 described above is used for the contact storage chamber 1.
The fixed contact 36 is fixed to the distal end of the body 10 as shown in FIG. A part of the terminal plate 32 is introduced into the contact accommodating chamber 13b and disposed substantially in parallel with the inner peripheral surface of the rear wall of the body 10, and as shown in FIG. One end of a 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.
The movable contact plate 37 has a spring force in a direction to separate the movable contact 38 from the fixed contact 36 so that the movable contact 38 is located forward of the fixed contact 36. Further, the two 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 to the movable contact 38 are opposite to each other. That is,
The two 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 12b described above is
It is formed so as to partition between both movable contact plates 37, and the contact storage chamber 13b is divided into two chambers by the partition wall 12b.

As described above, the external electric wires are connected to the terminal plate 31,
32 is separated from the contact storage chamber 13b, in which the fixed contact 36 and the movable contact 38 are stored, by the partition wall 12a.
4 and the electric wire insertion opening 16, the dust which intrudes into the inside of the body 10 from a portion opened to the outside
The contact can be blocked by a, and the occurrence of contact failure due to the attachment of foreign matter such as dust between the fixed contact 36 and the movable contact 38 can be prevented. A projecting rib 18 projects forward from a part of the partition wall 12a between the adjacent terminal plates 31 and 32. The projecting rib 18 is engaged with a positioning groove 41 provided in an inner cover 40 described later. By doing so, penetration of water droplets and the like into the inside of the body 10 is prevented.

An inner cover 40 having a shape shown in FIGS. 7 to 10 is attached to the opening on the front surface of the body 10. The inner cover 40 is attached to the body 10 so as to contact the front surface of the portion of the peripheral wall of the body 10 where the screw window 14 is formed and the front surfaces of the partition walls 12a and 12b. Here, the body 10 and the inner cover 40 are connected to the terminal plates 31 and 32.
Since it surrounds the conductive portions such as the movable contact plate 37 and the like, it is formed of a thermosetting synthetic resin, and the other synthetic resin molded member is formed of a thermoplastic synthetic resin. That is, the middle cover 40 functions as a partition for separating the terminal unit and the contact unit from a mechanism unit described later. At the periphery of the inner cover 40 along the peripheral wall on which the screw window 14 is formed in the body 10, a projecting wall 42 is provided on the front side, and the outer surface of the projecting wall 42 is substantially the same as the outer peripheral surface of the peripheral wall of the body 10. Be one. Also,
The remaining peripheral edge of the inner cover 40 is formed in a shape along the inner peripheral surface of the peripheral wall of the body 10. At four corners of the inner cover 40, holding ribs 43 are formed which are continuous with both ends of the protruding wall 42 and protrude outward from the outer surface of the protruding wall 42. At the front end of the holding rib 43, a mounting recess 43a opened forward is formed. A temporary fixing protrusion 44 protruding in the longitudinal direction of the protruding wall 42 is provided on the periphery of the inner cover 40 so as to be pressed against the inner peripheral surface of the body 10 in the vicinity of the assembly piece 11 provided on the body 10. The temporary fixing protrusions 44 are formed at four places, and 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 cross section substantially L
The mounting recesses 43 are formed on both side edges of the horizontal piece in FIG.
The mounting protruding piece 30a to be attached to a protrudes. Further, a thin hinge portion 30b is formed at an intermediate 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. Further, the rear end of the vertical piece of the terminal cover 30 (FIG. 2)
Locking projections 30c are provided on both sides of the lower end of the body 10. The locking protrusions 30c are provided on the rear surface of the body 10 with the screw window 14 closed by the terminal cover 30.
(See FIG. 5).

As shown in FIGS. 9 and 10, a positioning groove 41 for engaging with 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 projection 45 is the terminal plate 3
The terminal board 31 is positioned with respect to the inner cover 40 by engaging with the notch 31a (see FIG. 16) provided in FIG. 1 (see FIG. 29). The terminal plate 32 is positioned with respect to the inner cover 40 by sandwiching the terminal plate 32 between them. Therefore, the fixed contact 36 due to the movement of the movable contact plate 37 provided on the terminal plate 32
During the opening and closing operation between the fixed contact 36 and the movable contact 38, the position between the fixed contact 36 and the movable contact 38 does not shift, and the opening and closing operation is stabilized.

At the center of the inner cover 40, an insertion hole 4 through which a pusher 51 for transmitting an operating force by a pressing operation of a push button 50 held by the cover 20 to an 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 push button storage recess 22 that opens in a circular shape is provided at the center of the front surface, and push button sliding holes 23 are provided at four circumferential positions at equal intervals around the bottom wall of the push button storage recess 22, and A pusher sliding hole 24 is formed through the center of the bottom wall of the push button storage recess 22. Part of the peripheral wall of the push button storage recess 22 is formed by an annular guide rib 25 projecting rearward from the back surface of the cover 20. Further, the rear end surface of the guide rib 25 is located forward of the bottom surface of the push button storage recess 22 and serves as a locking surface 25a. A locking projection 23a projects forward from the bottom surface of the push button storage recess 22 between adjacent push button sliding holes 23.

The presser slide hole 24 is formed in a rectangular shape, and fixed plate holding ribs 24a are formed on the rear surfaces of both side edges.
Is protruded. Each fixing plate holding rib 24a is formed with a holding groove 24b that opens in front of each side edge of the presser slide hole 24 and that runs in the front-rear direction with the front end face opened. Both sides of the fixed plate 52 inserted from the front are held in the holding grooves 24b. As shown in FIG. 18, the fixing plate 52 is formed in a rectangular shape, a fixing notch 52a is formed at the rear of both side edges, and a locking projection 52b is protruded at the front of both side edges.
On both side edges of the fixing plate 52, there are formed inclined edges 52c which are inclined rearward and rearward of the fixing notch 52a so that the distance therebetween becomes smaller. Therefore, the fixing plate 52 is inserted into the holding groove 24b so that the inclined edge 52c is
When the rear end of the fixed plate holding rib 24a is fitted over the rear end of the fixed plate 52, the rear end of the fixed plate holding rib 24a is fitted into the fixing notch 52a, and the movement of the fixed plate 52 in the front-rear direction is prohibited. At this time, the locking projection 5
2b is in contact with the bottom surface of the push button storage recess 22. Fixed plate 52
A lever holding protrusion 52d protrudes from a front end of the fixing plate 52. A circular fulcrum hole 52e is formed in the lever holding protrusion 52d, and a horizontally long swing hole 52f is formed in the center of the fixing plate 52. .

The above-mentioned fixing 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 swinging hole. 52f. Therefore, the lever 53 can swing around the fulcrum hole 52e within the range of the swing hole 52f. The lever 53 is inserted into a lever notch 24 c formed on the periphery of the pusher sliding hole 24 while being held by the fixing plate 52.

Each leg 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.
5 respectively. The slide groove 54 is formed so as to run in the front-rear direction.
One leg piece of the lever 53 inserted through e is inserted.
As shown in FIGS. 19 and 20, the slide groove 55 is formed in a shape in which the front and rear ends are respectively closed, and the leg of the lever 53 comes into contact with the front end or the rear end, so that the slide groove 55 moves in the front and rear direction of the pusher 51. Movement is regulated.

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. 24, the cam groove 55 is provided with a substantially heart-shaped guide projection 55a at the center, and a groove 55b is formed around the guide projection 55a. It is divided into six regions. In each of the regions a to f in FIG. 24, the region a and the region e are the deepest, and a = a
The depth is set so that 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 projection 55a is shifted leftward in FIG. 24 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 of the outer peripheral surface of the projection 55a is shifted leftward from the center position of the concave portion at the front end of the peripheral surface surrounding the outside of the guide groove 55b. Therefore, if it is assumed that the pusher 51 is biased forward with the one leg of the lever 53 inserted into the cam groove 55 and the leg is initially located in the area a, Presser 51
The leg of the lever 53 moves counterclockwise in the cam groove 55 with the forward and backward movement of.

More specifically, when the pusher 51 is moved backward, the leg of the lever 53 is
At the rear end of 5a, it comes into contact with the right slope, and as a result, it is guided from the area a toward the area b, and gets over the area b to reach the area c. Here, when the pusher 51 is moved forward, the leg of the lever 53 is guided to the area d by the step between the area c and the area b, and the guide projection 55
The leg piece of the lever 53 falls into the concave portion at the front end of a, and is held at this position by the urging force acting on the pusher 51. Next, when the pusher 51 is moved backward, the lever 53 is moved.
Is guided to the area e by contacting the left slope at the front end of the guide groove 55b. When the pusher 51 is moved forward here, the leg of the lever 53 is guided to the area a and returns to the original position. Return to As described above, the leg of the lever 53 moves in the guide groove 55b counterclockwise in FIG.

At the rear end of the pusher 51, a pair of card pieces 51 a, which extend over the partition wall 12 b and come into contact with the respective movable contact plates 37, are formed in a forked shape. Further, a pair of push button connecting projections 51b are protruded from the front end of the pusher 51, and connecting claws 51c are protruded from the front end of each of the push button connecting protrusions 51b so as to approach each other. Connecting projection 5
The push button 50 housed in the push button housing recess 22 is connected to 1.

The push button 50 is formed in a shape shown in FIGS. 25 to 28, and is formed in a bottomed cylindrical shape having a closed front surface and an open rear surface. A connection protrusion 50a that is coupled to the connection protrusion 51b is provided in a protruding manner. The connecting protrusion 50a has a claw portion 50b bulging left and right at the rear end portion.
The push button 50 and the pusher 51 are connected by being inserted between 1b and engaging with the connection claw 51c.

The peripheral wall of the push button 50 has four guide pieces 50c formed at equal intervals in the circumferential direction and an adjacent guide piece 50c.
c and two hook pieces 50d formed between them. The hooking piece 50d has a locking claw 50e projecting outward at the rear end, and is inserted into the push button sliding hole 23. The locking claw 50e is a locking surface 25 which is a rear end surface of the guide rib 25.
When the push button 50 is moved backward, the forward movement of the push button 50 is restricted by being locked to the a.
The rearward movement of the push button 50 is regulated by the rear end surface of the guide piece 50c abutting on the locking projection 23a. As described above, the push button 50 advances and retreats with respect to the cover 20 between the position where the forward movement is restricted and the position where the backward movement is restricted. Also, the guide piece 50c and the hooking piece 50d slidably contact the inner peripheral surface of the guide rib 25 in the range of advance and retreat of the push button 50.
The rattling against 0 is prevented.

By the way, spring seat projections 50f are protruded at four places on the inner peripheral surface of the push button 50. One end on the large diameter side of a return spring 56 made of a conical spring abuts on the spring seat projection 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 periphery of the pusher insertion hole 23, and the push button 50 is urged forward by the return spring 56. . Further, since the return spring 56 is a conical spring, a substantially constant return force can be obtained irrespective of the pushing amount of the push button 50, and the operational feeling is good.

When manufacturing the push button switch having the above-described structure, the terminal plates 31 and 32 to which the terminal screws 35 to which the nuts 34 are screwed are attached, and the inner cover 40 is attached to the body 10. Put on the body 10. The terminal cover 30 is attached to the inner cover 40. For the cover 20, the fixing plate 52 is provided in the holding groove 24b.
And each leg of the lever 53 is inserted into the slide groove 54 and the cam groove 55 of the pusher 51 through the fulcrum hole 52e and the swing hole 52f of the fixing plate 52, respectively. afterwards,
The return spring 56 is stored in the push button storage recess 22 of the cover 20, and the push button 50 is fitted into the push button storage recess 22. At this time, the connecting projection 50a of the push button 50 is engaged with the push button connecting projection 51b of the pusher 51, and the push button 50 and the pusher 51 are connected, and at the same time, the return spring 56 is moved between the push button 50 and the cover 20. Will be retained. The cover 2 in which the parts are assembled as described above
The push button switch can be assembled by putting the cover 0 on the body 10 on which the inner cover 40 and the terminal cover 30 are mounted and engaging the assembly claws 21 with the assembly pieces 11. Here, since the cover 20 is formed of a thermoplastic synthetic resin, the assembly claws 21 can have sufficient flexibility. Since the push button 50 is also formed of a thermoplastic synthetic resin, simply by storing the push button 50 in the push button storage recess 22, the hook piece 50 d is bent and the locking claw 50 e is engaged with the locking surface 25 a of the guide rib 25. It can be stopped. In addition, since all the components can be assembled from the front, automation of assembly using an assembly machine is facilitated.

Next, the operation will be described. As shown in FIG. 30, 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, and the rear leg of the lever 53 It is kept in a state where it has fallen into the area a. In this state, the hook piece 5 of the push button 50 is
The forward movement of the push button 50 is restricted by the engagement of a locking claw 50e provided at the rear end of Od with the locking surface 25a, which is the rear end surface of the guide rib 25. At this time, in the moving range of the pusher 51, the rear end of the pusher 51 is
, The movable contact plate 37 is in a state where the movable contact 38 is separated from the fixed contact 36.

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

On the other hand, when the contact portion is in a closed state,
When the push button 50 is pressed, as shown in FIG. 31, the rear leg of the lever 53 moves to the area e of the cam groove 55. When the pressing force on the push button 50 is released in this state, the return spring 56 is released.
The spring force of the lever 53 moves the lever 53 to the area a of the cam groove 55 and returns to the state shown in FIG. After all, FIG.
As shown 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 and held on, and if the push button 50 is pressed again, it is turned off. Therefore, a push-on / push-off type push button switch can be provided.

The push button switch having the above configuration is attached to a circular mounting hole formed in a building material such as a wall panel by a plate set having a shape as 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. And a decorative plate 90 disposed on the front side of the fireproof panel 80.

At both sides of the rear surface of the plate frame 60, mounting legs 62 having a substantially U-shaped cross section are integrally protruded, and both mounting legs 62 are inserted into mounting holes formed in the building material. Plate frame 60
Are formed with insertion holes 63 at positions corresponding to the mounting legs 62, and mounting screws 64 are inserted into the insertion holes 63 from the front side of the plate frame 60. A detent 64a made of synthetic resin is attached to the base of the base of the mounting screw 64, and a pin fitting 65 is screwed to the tip of the mounting screw 64. A notch 62a is formed at the rear end of the mounting leg 62 so that the distal end of the clamp 65 can protrude in the circumferential direction of the outer peripheral edge of the plate frame 60, and is screwed with the mounting screw 64 of the clamp 65. The periphery of the part where it is located 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 distal end of the clip metal 65 is projected from the notch 62a, the clip metal 65 first rotates together with the mounting screw 64, and the side surface of the clip metal 65 contacts the mounting leg 62. After the rotation of the clamp 65 stops, the clamp 65 moves toward the plate frame 60 while being guided by the mounting legs 62 with the tightening of the mounting screw 64. With this configuration, the erection material can be sandwiched between the peripheral portion of the plate frame 60 and the sandwich fitting 65, and the plate frame 60 can be fixed to the erection material. The plate frame 60 is also provided with a pair of fixing holes 66 for inserting screws to be screwed into the building material at positions different from the insertion holes 63.

The middle frame 70 is removably attached to the opening window 61 of the plate frame 60. At four corners of the middle frame 70, engaging claws 71 are integrally protruded. The inside of the opening window 61 has an engagement notch 67 with which the engagement claw 71 is engaged.
Is formed. Therefore, when the middle frame 70 is inserted into the opening window 61 of the plate frame 60 from the front, the engagement claws 71 are engaged with the engagement notches 67 so that the middle frame 70 is detachably attached to the plate frame 60. Will be done.

The above-described push button switch 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 is provided with a holding claw (not shown) that engages with the mounting claw 20a provided on the case of the push button switch.
Is formed. Further, a holding hole 73 is formed in the other side piece of the middle frame 70 facing the elastic piece, and a mounting claw 20a protruding from the side surface of the case of the push button switch is provided with the holding hole 7.
3 is engaged. That is, the push button switch is attached to the mounting claw 20a.
Is attached to the middle frame 70 by engaging with the middle frame 70, and two pairs of holding claws and two holding holes 73 are provided. When removing the push button switch from the middle frame 70, the elastic piece may be bent outward with the tip of a tool such as a screwdriver. The refractory panel 80 includes a protruding base 8 protruding forward.
1 is provided in the center, and a window hole 82 for exposing the push button switch is formed in the center of the protruding base 81. The window 82 is set to be twice as large as the module size. A hole 83 for exposing the head of the mounting screw 64 and a cutout 84 for exposing the head of the screw inserted into the fixing hole 66 are formed in the periphery of the fireproof panel 80. . Further, on the periphery of the refractory panel 80, a claw portion 85 to be inserted into a positioning hole 68 formed in the plate frame 60 is protrudingly provided. Here, in order to prevent the refractory panel 80 from falling off from the plate frame 60, the hole 83 and the notch 84
At the periphery of the mounting screw 64 or the fixing hole 66, respectively.
Pressing pieces 86 and 87 which are sandwiched between the plate frame 60 by the heads of screws inserted through the protrusions are provided.

The decorative plate 90 has an outer diameter of the plate frame 6.
An opening 9 for exposing the front surface of the push-button switch is formed in the center portion in a disk shape substantially corresponding to the outer diameter of 0 and having an open rear surface.
1 is formed. The opening 91 has substantially the same size as the window hole 82 of the fireproof panel 80. The decorative plate 90 is disposed 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.
A joint piece 92 having elasticity is protruded from the back surface of the decorative plate 90, and the joint piece 92 is engaged with the joint hole 69 of the plate frame 60 through a through hole 88 formed in the projecting base 81 of the fireproof panel 80. By doing so, the decorative plate 90 is detachably connected to the plate frame 60.

As described above, the push button switch is set to the middle frame 70.
3 is attached to the plate frame 60 through FIG.
2 shows a state in which a push button is attached to the plate set.
Since the middle frame 70 of the above-mentioned plate set has a holding claw and a holding hole 73 so as to be able to hold a standardized embedded wiring device, an outlet or a switch of another configuration is used. Therefore, it is possible to divert the mounting device of another wiring device such as, and it is not necessary to manufacture a new mounting device. Also, since the mounting device is shared with other wiring equipment, the appearance can be unified with other wiring equipment,
It also has the advantage of good appearance.

[0053]

According to the first aspect of the present invention, the case is held by the inner frame, and the inner frame is attached to the plate frame attached to the erection material by inserting the rear part into a circular mounting hole formed in the erection material. The mounting material has an effect that the building material can be easily mounted by forming a circular mounting hole. In addition, the case is attached by engaging the mounting claw with the middle frame, and the case can be easily attached to the middle frame.

Also, the case is formed by connecting the body and the cover, and the inner space between the body and the cover is partitioned by the inner cover, and the inner space is surrounded by the body and the inner cover. Accommodates the contact portion and the terminal portion, and accommodates the mechanism portion in a space surrounded by the cover and the inner cover, so that the conductive portion can be separated from other portions. That is, the advantage that dust from the portion of the push button exposed to the outside of the case to the conductive portion can be prevented from entering there Ru.

In addition, a pusher for transmitting a pressing force from the push button to the movable contact plate provided at the contact portion is provided, and a push button connecting projection provided at the front end of the pusher and a connection provided at the rear side of the push button. The pusher and the pushbutton are connected by engaging the projection, so that the pushbutton and the pusher can be integrally linked, and the work of connecting the pushbutton and the pusher is facilitated. .

According to the second aspect of the present invention, since the push button is urged forward by the return spring, the pusher integrally connected to the push button is also urged forward. In addition, a substantially heart-shaped cam groove whose tip is the rear end side of the pusher is formed on the side surface of the pusher, and a part of the lever held by the cover is inserted into the cam groove. Each time the lever is pushed backward once against the spring force of the return spring, the lever makes approximately half a revolution in the cam groove, and the movable contact contacts the fixed contact and the movable contact is separated from the fixed contact. Since the pushers are held at the respective positions, each time the push button is pressed once, the ON / OFF of the contact portion can be reversed, so that a so-called push-on / push-off operation becomes possible. That is, in the recovery work after the push button is pressed to operate the emergency bell or the like, it is only necessary to press the push button again, and there is an advantage that the recovery work becomes easier as compared with the conventional configuration.

According to the third aspect of the present invention, since the partition for separating the terminal storage chamber for storing the terminal portion and the contact storage chamber for storing the contact portion is formed in the body, the partition for introducing the external electric wire into the body is provided. There is an advantage that dust can be prevented from entering the contact portion by the partition. According to a fourth aspect of the present invention, a notch is formed at a key point of the terminal plate provided with the fixed contact to engage with a positioning projection protruding from a rear surface of the inner cover, and the terminal plate is mounted in the body. When the inner cover is attached to the body, there is an advantage that rattling of the terminal plate can be prevented by engagement of the notch and the positioning projection.

According to a fifth aspect of the present invention, since the thickness of the rear wall of the body at the peripheral portion of the wire insertion port is larger than other portions,
The electric wire insertion opening can be formed relatively deep, and the external electric wire can be securely held by the electric wire insertion opening, so that there is an advantage that even if the external electric wire is bent, it is difficult to fall off the body. The invention according to claim 6 is characterized in that the push button is housed in the push button storage recess formed on the front surface of the cover so as to be able to move back and forth, and the locking claw protruding from the periphery of the push button at the front end position in the range of the front and rear movement of the push button. Since the cover is provided with a locking surface that abuts and a locking protrusion that abuts the rear end surface of the push button at the rear end position, there is an advantage that the movement range of the push button can be regulated.

[0059] The invention of claim 7, a portion of the peripheral wall of the push button and catching piece, there than engaging pawl outwardly is projected on the tip portion of the catching piece, engages in the configuration of claim 6 The pawl can be formed at the tip of the hook. According to the eighth aspect of the present invention, since the spring seat protrusion with which one end of the return spring made of a conical spring abuts on the periphery of the inner bottom surface of the push button, the return spring can be positioned with respect to the push button. This has the advantage that variations in the operating force of the push button can be prevented. Moreover, since the return spring is a conical spring, the return force can be made substantially constant irrespective of the pushing amount of the push button, and there is an advantage that the operational feeling is good.

According to the ninth aspect of the present invention, the body and the cover are formed by engaging a hooking projection provided at a rear end of an assembly claw projecting rearward from the cover with a peripheral edge of a hooking hole formed in a peripheral portion of the body. Is joined, so that the body and the cover can be easily joined, and there is an advantage that the assembling work is facilitated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a relationship with a plate set of an embodiment.

FIG. 2 is an exploded perspective view of the embodiment.

FIG. 3 is a front view of a body used in the embodiment.

FIG. 4 is a sectional view taken along line XX of FIG. 3 of the body used in the embodiment.

FIG. 5 is a rear view of the body used in the embodiment.

FIG. 6 is a sectional view taken along line YY in FIG. 3 of a body used in the embodiment.

FIG. 7 is a front view of an inner cover used in the embodiment.

FIG. 8 is an XX of FIG. 7 of the inner cover used in the embodiment.
It is a line sectional view.

FIG. 9 is a sectional view of an inner cover used in the embodiment.

FIG. 10 is a rear view of the inner cover used in the embodiment.

FIG. 11 is a front view of a cover used in the embodiment.

FIG. 12 is a cross-sectional view of a cover used in the embodiment.

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

FIG. 14 is a side view of a cover used in the embodiment.

FIG. 15 is a longitudinal sectional view of a cover used in the embodiment.

FIG. 16 shows one terminal plate used in the embodiment, and FIG.
Is a front view, and (b) is a side view.

FIG. 17 shows another terminal plate used in the embodiment, and FIG.
Is a front view, and (b) is a side view.

FIGS. 18A and 18B show a fixing plate used in the embodiment, wherein FIG. 18A is a front view and FIG. 18B is a side view.

FIG. 19 is a front view showing a presser used in the embodiment.

FIG. 20 is a side view showing a presser used in the embodiment.

FIG. 21 is a rear view showing a presser used in the example.

FIG. 22 is a plan view showing a presser used in the embodiment.

FIG. 23 is a bottom view showing a presser used in the example.

FIG. 24 is a front view of a main part of a presser used in the example.

FIG. 25 is a front view of a push button used in the embodiment.

FIG. 26 is a vertical sectional view of a push button used in the embodiment.

FIG. 27 is a rear view of the push button used in the embodiment.

FIG. 28 is a cross-sectional view of a push button used in the embodiment.

FIG. 29 is a partially cutaway front view of the embodiment with a push button removed.

FIG. 30 is an operation explanatory view showing an embodiment.

FIG. 31 is an operation explanatory view showing the embodiment.

32 (a) is a front view, FIG. 32 (b) is a side view, and FIG. 32 (c) is a bottom view.

FIG. 33 is a diagram showing the operation of the example.

FIG. 34 is a diagram showing an operation of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Body 11a Hook hole 12a Partition wall 13a Terminal storage room 13b Contact storage room 14 Screw window 16 Wire insertion port 20 Cover 20a Mounting claw 21 Assembly claw 21a Hook protrusion 22 Push button storage recess 23a Lock protrusion 25a Lock surface 31 Terminal plate 31a Notch 32 Terminal plate 34 Square nut 35 Terminal screw 36 Fixed contact 37 Movable contact plate 38 Movable contact 40 Inner cover 45 Positioning protrusion 50 Push button 50a Connecting protrusion 50c Guide piece 50d Hook piece 50e Locking claw 50f Spring seat protrusion 51 Pusher 51b push button connecting projection 53 lever 55 cam groove 56 return spring 60 plate frame 61 opening window 70 middle frame 90 decorative plate 91 opening

Continuing from the front page (72) Inventor Hideki Yokoyama 1048 Odomo Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-5-68314 (JP, A) JP-A-4-73892 (JP, A) JP-A-3-30218 (JP, A) JP-A-4-196021 (JP, A) JP-A-61-142336 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 13/00-13/76 H01H 9/00-9/06 H02G 3/02 301 G08B 17/00

Claims (9)

(57) [Claims] Rear is freely attached removably to the central part in an opening formed window attached to Help rate frame in building material in the inserted form in claim 1] mounting hole of the circular formed building material A push button switch including a case held by the middle frame, wherein a front surface of the case held by the middle frame is exposed from an opening formed in a central portion of a decorative plate attached to a front surface of the plate frame,
A body that opens to the front and a cover attached to the front of the body
The space between the bar, body and cover is the body side
The case is composed of the inner cover and the inner cover
Terminal for connecting the external circuit and the connection for opening and closing the external circuit.
The point part is stored in the space surrounded by the body and the inner cover.
The push button that moves back and forth by the push operation is exposed on the front of the cover , and opens and closes the contact part in conjunction with the push operation of the push button.
The mechanism is stored in the space surrounded by the cover and the inner cover.
It is, on the side of the to case attachment claw coupling is projected to standardized mounting frame for wiring accessories, case middle frame uneven engagement with preparative Tsuketsume is relative middle frame is held And the contacts are located
Fixed contact fixed to the device and facing the front of the fixed contact
Equipped with a movable contact at the tip to separate the movable contact from the fixed contact
Consists of a movable contact plate that is spring-biased in the
A pusher that is connected and transmits the pressing force to the push button to the movable contact plate
It is arranged so that it can be inserted through the inner cover.
A pair of push button connecting projections are projected, and both push buttons are
Engage with the push button connection projection inserted between the button connection projections
A push button switch characterized by comprising a connecting projection protruding therefrom. A return spring for urging the push button forward.
On the side of the pusher.
G-shaped cam groove is formed, and it is almost fixed position in the front-back direction
And in the plane perpendicular to the front-rear direction,
The movable lever is held by the cover and the push button is
Each time you push backward once against the spring force of the return spring
The lever makes approximately half a turn in the cam groove and connects the movable contact to the fixed contact
The position to touch and the position to separate the movable contact from the fixed contact
Characterized by holding the presser at each position of
The push button switch according to claim 1 . 3. A terminal housing for housing a terminal portion in a body.
A partition is formed to separate the chamber and the contact storage chamber that stores the contact section
The push-button switch according to claim 1 , wherein the push-button switch is formed. 4. The terminal portion includes a terminal plate partially housed in a terminal storage room, and the other portion of the terminal plate is extended into the contact storage room, and a fixed contact or a movable contact plate is fixed to an extended portion. 4. The push button switch according to claim 3, wherein a cutout portion is formed at a key point of the terminal plate provided with the fixed contact to engage with a positioning projection projected from a rear surface of the inner cover. 5. The terminal part is partially provided on the inner peripheral surface of the peripheral wall of the body.
A substantially parallel terminal plate and the inner peripheral surface of the peripheral wall of the body in the terminal plate
For screws that are inserted into a part parallel to
When the head is exposed from the window and external wires are
And a terminal screw with a square nut
Wire that introduces an external wire between the terminal plate and the square nut
An insertion hole is drilled in the rear wall of the body and
The thickness of the rear wall of the body should be larger than other parts
The push button switch according to claim 1, wherein: 6. A push button storage recess having an inner shape substantially corresponding to the outer shape of the push button and containing the push button is opened on the front surface of the cover , and a peripheral portion of the push button at a front end position in a range of forward and backward movement of the push button. 2. The cover according to claim 1, wherein the cover has a locking surface abutting on a locking claw projecting outward and a locking protrusion abutting on a rear end surface of the push button at a rear end position. Push button switch. 7. The push button has a front surface closed and a rear surface opened.
It is formed in a bottomed cylindrical shape, and the peripheral wall of the push button is
The guide piece that slides on the inner peripheral surface and the guide piece are provided separately.
The hook consists of a hook and a hook at the tip of the hook.
7. The push button switch according to claim 6 , wherein the push button switch is provided in a protruding manner . 8. A conical spring is formed around the inner bottom surface of the push button.
The spring seat projection that one end of the return spring contacts
The push button switch according to claim 7 , wherein the switch is formed. 9. A peripheral edge of a hook hole formed in a peripheral portion of a body.
At the rear end of the assembly claw projecting rearward from the cover .
By engaging the hooking projection, the body and cover are
2. The push-button switch according to claim 1 , wherein the push-button switch is combined .