JP3140943B2 - Ignition switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition switch used in combination with a press-type gas valve in gas appliances such as a gas oven and a water heater, and more particularly to a push-push type ignition which also serves as a press-operating device for a gas valve. About the switch.

[0002]

2. Description of the Related Art There is a pressing type gas valve used for gas appliances such as a gas oven and a water heater. This press-type gas valve is usually operated by a push-push type press operation device. A conventional configuration of a push-push type pressing operation device will be described with reference to FIG.

[0003] The pressing operation device arranged rearward in the pressing direction of the gas valve 1 includes a case 10 screwed to the rear surface of the gas valve 1, and an operation rod 20 provided in the case 10. The operating rod 20 is located immediately behind the valve rod 2 in the gas valve 1 and is urged rearward by a spring 40.

The operating rod 2 against the urging force of the spring
When 0 is pushed forward from the initial position, the valve rod 2 moves forward, and the main valve 3 and the electromagnetic safety valve 4 move to the open position.
The inlet 5 communicates with the outlet 6. The pushed operation rod 20 finally reaches the stroke end. At this time, the switch of the main circuit incorporated in the pressing operation device is operated, and the electromagnetic safety valve 4 is fixed at the open position. In addition, a switch for the ignition device is operated near the stroke end to perform ignition.

[0005] When the pushing force is removed, the operating rod 20 returns to the intermediate position and is locked at this position. This allows
The ignition is stopped, but the main valve 3 is still in the open position. When the operating rod 20 is pushed again from the intermediate position, the locked state of the operating rod 20 is released, and the operating rod 20 retreats to the initial position. Thereby, the main valve 3 returns to the closed position. Further, the main circuit is turned off, and the electromagnetic safety valve 4 returns to the closed position. Such a two-stage operation of the operating rod 20 is realized by a push-push mechanism 30 using a heart-shaped cam groove.

[0006] The push / push mechanism 30 includes an operating rod 2.
0, a cam groove 31 formed on the lower surface and an engaging element 32 held below the case 10. The engaging element 32 has a tip bent in a hook shape and is elastically inserted into the cam groove 31.

The conventional cam groove 31 has a heart shape as shown in FIG. When the operating rod 20 is pushed from the initial position to the stroke end, the engaging element 32 in the cam groove 31
Moves from A to B. When the operating rod 20 retreats from the stroke end to the intermediate position, the engaging element 32 moves from B to C and is fixed to C. When the operating rod 20 is pushed forward again, the engagement element 32 slightly moves from C to D. As a result, the operating rod 20 is released from the locked state, and by removing the pushing force in this state, the engaging element 32 returns from D to A, and the operating rod 20 returns to the initial position.

Conventionally, microswitches have been used as switches for the main circuit and the ignition device incorporated in the pressing operation device. However, there has been a problem that the ignition timing is not constant due to a mounting error of the microswitch, an individual difference of the microswitch, and a variation in operation due to the interposition of the microswitch actuator. Therefore, the present applicant has previously developed an ignition switch which also serves as a pressing operation device in which a brush for an ignition device and further a brush for a main circuit are directly attached to an operation rod, and a substrate in contact with the brush is attached to a case. Hei 6-11921
No. 5 filed a patent application.

[0009]

However, the conventional pressing operation device including the ignition switch developed by the present applicant has the following problems.

When the operating rod is pushed in for the first time, the operating rod reaches the stroke end. On the other hand, when the operating rod locked at the intermediate position is pushed again, the operating rod does not reach the stroke end, and the engaging element in the cam groove hits the groove wall, so that the operating rod advances only slightly. The reason why the re-advancing stroke of the operating rod is limited is to prevent the ignition device from being turned on at the time of re-advancing. In order to limit the re-advancing stroke of the operating rod, the cam groove has an asymmetrical heart shape with an extremely limited distance from the intermediate locking position to the re-advance limit compared to the retreat distance from the stroke end to the intermediate locking position. (FIG. 12).

However, the following problem arises due to the short stroke when the second pressing is performed. When the operating rod is pushed in, the tip of the engaging element inserted into the cam groove hits the groove wall.
When the second pushing is performed, there is a possibility that the engaging element may be deformed or lifted. When the operating rod is pushed in, there is a collision, and the operational feeling, especially the certainty is lacking.
Since the engaging element must be rotated from the intermediate locking position to the unlocking position with a slight stroke, the engaging element is likely to malfunction, and the operation feel is degraded.

The present invention has been made in view of such circumstances, and even if the second pushing is performed with a strong force, the engaging element is not deformed or lifted, and the operation feeling of the pushing operation is good. It is an object to provide a simple ignition switch.

[0013]

A first ignition switch according to the present invention is an ignition switch provided on a press-type gas valve of a gas appliance and serving also as a press-operation device for the gas valve, and is fixed to the press-type gas valve. And
An operating rod capable of reciprocating in the pressing direction in the case, a heart-shaped cam groove on one of the case and the operating rod, and an engaging element elastically inserted into the cam groove on the other; A push-push mechanism that locks the return operation from the stroke end to the initial position at the intermediate position and releases the lock at the intermediate position by re-advancing from the intermediate position, and moves relative to the moving direction of the operating rod. A floating slider having a brush for an ignition device on its surface, and fixed to a case facing the slider,
A substrate on which a contact pattern for contacting the brush is formed on the surface, and a re-advance path of the cam groove in the push-push mechanism is extended so that the operation rod reaches its stroke end when the operation rod is re-advanced, A second cam groove is provided on one of the operating rod and the slider, and a second engaging element elastically inserted into the second cam groove is provided on the other. A relief portion is formed in the second cam groove to guide the second engagement element and move the slider relative to the operation rod in a direction opposite to that of the operation rod. It is characterized in that the slider is moved to follow and the slider is left at the intermediate position when the operating rod is re-advanced.

[0014] A second ignition switch according to the present invention is an ignition switch provided on a press-type gas valve of a gas appliance and also serving as a press-operation device for the gas valve, wherein a case fixed to the press-type gas valve, An operating rod capable of reciprocating in the pressing direction, a heart-shaped cam groove on the side of the case, and an engaging element elastically inserted into the cam groove on the side of the operating rod, and a stroke of the operating rod. A push-push mechanism that locks the return operation from the end to the initial position at the intermediate position, releases the lock at the intermediate position by re-advancing from the intermediate position, and moves relative to the operating rod in the same direction. A floating type slider held on the case and having a brush for the ignition device on the surface, and a contact pattern fixed to the case facing the slider and contacting the brush on the surface are formed. A re-advancing path of the cam groove is extended so that the operating rod reaches its stroke end when the operating rod re-advances, and an engaging element is inserted into the cam groove through a slit formed in the slider, A relief part is formed in the slit to guide the engaging element in the slit when the operating rod re-advance and to move the slider relative to the operating rod in the opposite direction. It is characterized by following the rod and leaving the slider at the intermediate position when the operating rod re-advances.

In any of the ignition switches, a second slider that moves following the operating rod is provided in parallel with the floating slider, and a brush for a safety device is attached to the surface of the second slider, It is preferable that a contact pattern for contacting the brush is formed on the surface of the substrate.

[0016]

In the first ignition switch according to the present invention, when the operating rod is pushed in from the initial position, the operating rod reaches the stroke end. When the pushing force is removed, the operating rod is locked at the intermediate position. The floating slider held by the operating rod is basically operated by the operating rod because the second engaging element is inserted into the second cam groove.
When the operating rod reaches the stroke end from the initial position,
When the vehicle retreats from the stroke end to the intermediate position, it follows the operating rod. When the operating rod is pushed in from the intermediate position, the operating rod is released from the locked state and retracts to the initial position. At the time of the second pushing, the operating rod reaches the stroke end, but the slider is left at the intermediate position due to the provision of the relief portion in the second cam groove. Therefore, at the time of the second pushing, the ignition device is not turned on even though the operating rod reaches the stroke end.

In the second ignition switch according to the present invention, when the operating rod is pushed in from the initial position, the operating rod reaches the stroke end. When the pushing force is removed, the operating rod is locked at the intermediate position. The floating slider held in the case is basically operated by the operating rod because the engaging element attached to the operating rod penetrates the slider, so that the operating rod can reach the stroke end from the initial position. Also, when retreating from the stroke end to the intermediate position, it follows the operating rod. When the operating rod is pushed in from the intermediate position, the operating rod is released from the locked state and retracts to the initial position. At the time of this second pushing, the operating rod reaches the stroke end, but the slider is left at the intermediate position due to the provision of the escape portion in the slit through which the engaging element penetrates. Therefore, at the time of the second pushing, the ignition device is not turned on even though the operating rod reaches the stroke end.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing an entire structure of one example of a first ignition switch according to the present invention, FIG. 2 is a schematic longitudinal sectional side view showing a state where the ignition switch is combined with a gas valve, and FIG. 4 is a vertical sectional front view of the ignition switch, FIG. 4 is a partially cutaway bottom view of the ignition switch, FIG. 5 is an enlarged view showing a shape of a cam groove, and FIGS. 6 and 7 are schematic bottom views showing operation of the ignition switch. It is.

As shown in FIGS. 1 to 4, the ignition switch includes a case 10 screwed to the rear end face of the press-type gas valve, an operating rod 20 inserted and housed in the case 10 from behind. A push / push mechanism 30 for performing a two-stage pushing operation on the operating rod 20;
0 held by the operation lever 20 and the substrate 60 held by the operation rod 20.
It has two sliders 70, 80 and a second cam mechanism 90 for operating the slider 80.

The operating rod 20 can freely reciprocate in the case 10 in the pressing direction of the gas valve, and is urged rearward in the pressing direction by a spring 40. The structure of the press-type gas valve 1 is as described above.

The operating rod 20 has a main body 21 having a rectangular cross section. A round hole 22 into which a spring 40 is inserted is provided on the front surface of the main body 21. A rod 23 for operating the valve rod 2 of the gas valve 1 is provided at the center of the round hole 22.

A projection 24 for forming the push-push mechanism 30 is provided at the lower end of the front surface of the main body 21. A guide plate 25 projects from one side surface of the main body 21, and a slider holding plate 26 for holding the sliders 70 and 80 projects from the other side surface.

The case 10 for accommodating the operating rod 20 includes a mounting plate 11 abutting on the rear end face of the gas valve, and an operating rod 20.
A first accommodating portion 12 provided behind the mounting plate 11 for accommodating the main body 21, a second accommodating portion 13 projecting forward of the first accommodating portion 12 for accommodating the projection 24, and a guide plate 25. A third housing portion 14 protruding to one side of the first housing portion 12 for housing the first housing portion 12 and a first housing portion 14 for supporting the substrate 60.
And a substrate supporting portion 15 protruding to the other side of the housing portion 12.

The slider holding plate 26 of the operating rod 20 projects over the substrate supporting part 15 through a slit 16 provided on the other side surface of the first housing portion 12. It moves forward and backward on the support portion 15.

A round hole 17 is provided in the center of the mounting plate 11. The valve rod 2 of the gas valve 1 is inserted into the first storage portion 12 through the round hole 17 and abuts on a rod 23 formed on the main body 21 in the first storage portion 12.

The push / push mechanism 30 includes the operating rod 2
0, a cam groove 31 formed on the lower surface of the projection 24, and a projection 2
An engaging element 32 elastically held by a spring 33 is provided below the second housing portion 13 of the case 10 into which the case 4 is inserted.

The engaging element 32 is a metal rod whose both ends are bent upward. The front end, which is the pivot of the engagement element 32, is inserted into the lower surface of the distal end of the second housing 13. The rear end, which is the operating point of the engagement element 26, is elastically inserted into the cam groove 31 through an arcuate slit 18 formed on the lower surface of the second housing 13 of the case 10.

The cam groove 31 has a substantially symmetrical heart shape as shown in FIG. When the operating rod 20 is pushed from the initial position to the stroke end against the urging force of the spring 40, a cam groove 31 formed on the operating rod 20 side is formed.
Moves forward, and as a result, the engagement element 32 in the cam groove 31 moves from A to B. When the pushing force is removed, the engaging element 32
Moves from B to C and is fixed to C. Thus, the operating rod 20 returning from the stroke end is locked at the intermediate position.

When the operating rod 20 locked at the intermediate position is pressed forward again, the engaging element 32 moves from C to D and the locked state is released. Here, the distance from B to C is C
Is set to be almost the same as the distance from D to D. Thus, the operating rod 20 can reach the stroke end even at the time of the second pushing. When the second pushing force is removed, the engaging element 32 returns from D to A, and the operating rod 20 returns to the initial position.

As described above, the retracted distance from the stroke end to the intermediate locking position and the distance from the intermediate locking position to the re-advance limit at the time of the first pushing are symmetrical heart-shaped cam grooves. The first feature of the present ignition switch is that the stroke 31 is formed so that the stroke end can be reached even when the operating rod 20 is pushed in a second time.

A substrate 60 is mounted and fixed on the substrate support 15 of the case 10 via a support frame 50. On the slider holding plate 26 of the operating rod 20, two sliders 70 and 80 are held side by side.
The support frame 50 also serves as a guide for the sliders 70 and 80, and the sliders 70 and 80 are formed on the support frame 50.
Are accommodated in the two guide grooves 51 and 52, respectively.

The outer slider 70 is for the main circuit and is a second slider. The slider 70 is provided in the guide groove 5
The projection 29 is fixed to the slider holding plate 26 by a projection 29 protruding into the guide groove 51 through a slit 53 provided at the bottom of one groove. Therefore, the outer slider 70 is
Follow a zero movement. On the upper surface of this slider 70,
A brush 71 for the main circuit is attached.

The inner slider 80 is a floating type slider for an ignition device. This slider 80
Has a brush 81 for an ignition device on the upper surface, and is connected to the slider holding plate 26 by a second cam mechanism 90 so as to be relatively movable.

The second cam mechanism 90 includes a second cam groove 91 formed on the lower surface of the slider 80 and a second engaging element 92 held on the slider holding plate 26. The engagement element 92 is a metal rod whose both ends are bent upward, and is urged upward by a leaf spring 93 held inside the slider holding plate 26. The front end, which is the pivot of the engagement element 92, is inserted into the slider holding plate 26. The rear end, which is the operating point of the engagement element 92, is elastically inserted into the cam groove 91 through a rectangular opening 27 formed on the upper surface of the slider holding plate 26.

The cam groove 91 is substantially Y-shaped as shown in FIG.
It is a shape. When the operating rod 20 is pushed from the initial position to the stroke end against the urging force of the spring 40,
The engaging element 92 attached to the slider holding plate 26 of the operating rod 20 advances, and as a result, the engaging element 9 in the cam groove 91 is moved.
2 moves from a to b. Here, the distance from a to b is sufficiently smaller than the stroke of the operating rod 20. Therefore, when the operating rod 20 is pushed for the first time, the slider 80 is pressed.
Follows and moves forward. When the pushing force is removed, the engagement element 92 slightly moves from b to c. Therefore, the operating rod 2
When 0 returns from the stroke end, the slider 80 retreats following the movement of the operating rod 20.

When the operating rod 20 locked at the intermediate position is pressed forward again, the engaging element 92 of the operating rod 20 held by the slider holding plate 26 moves from c to d. Where c
Is set to be substantially the same as the stroke of the operating rod 20 at the time of re-advance, that is, the distance from C to D. As a result, the slider 80 remains at the intermediate position, and only the operating rod 20 reaches the stroke end. The portion from c to d in the cam groove 91 is a relief portion. When the second pushing force is removed, first, the engagement element 32 returns from d to a. Thereafter, while the operating rod 20 returns from the intermediate position to the initial position, the slider 80 is pushed by the engaging element 92 and the operating rod 2
It returns to the initial position following the retreat of 0.

As described above, by the second cam mechanism 90,
A second feature of the present ignition switch is that the slider 80 for the ignition device is left at the intermediate position when the operating rod 20 locked at the intermediate position is pressed forward again.

The main circuit brush 71 and the ignition device brush 81 provided on the upper surfaces of the sliders 70 and 80, respectively.
Are in contact with the main circuit contact pattern and the ignition device contact pattern formed on the lower surface of the substrate 60, respectively. The substrate 60 is the substrate holding part 1 of the case 10 as described above.
2 is fixed by a support frame 50.

Next, the operation of the ignition switch will be described with reference to FIGS. The present ignition switch has the following effects by having the two structural features described above.

When the operating rod 20 is in the initial position shown in FIG. 6A, the outer slider 70 directly held by the slider holding plate 26 of the operating rod 20, that is, the slider for the main circuit is in the initial position. . The inner slider 80 held by the slider holding plate 26 via the second cam mechanism 90, that is, the slider for the ignition device,
Since the engaging element 92 in 1 is at a, it is also at the initial position.

As shown in FIG. 6B, the spring 40
When the operating rod 20 is pushed forward from the initial position against the urging force of the lever, the engaging element 32 in the cam groove 31 moves from A to B in the push-push mechanism 30, so that the operating rod 20 reaches the stroke end. . At this time, the slider 7 for the main circuit directly held by the slider holding plate 26 is used.
0 moves forward following the operating rod 20. Since the slider 80 for the ignition device held by the slider holding plate 26 via the second cam mechanism 90 only moves the engaging element 92 in the cam groove 91 from a to b in the cam mechanism 90, Pushed by the engaging element 92, the slider 70 moves forward by following the operating rod 20 by almost the same distance as the slider 70. Therefore, both the main circuit and the ignition device are turned on. When the main circuit is turned on, the electromagnetic safety valve 4 of the gas valve 1 operates.

When the pushing force applied to the operating rod 20 is removed, the engaging element 32 in the cam groove 31 moves from B to C in the push / push mechanism 30 as shown in FIG. The operation rod 20 is locked at the intermediate position. At this time, the slider 70 for the main circuit directly held by the slider holding plate 26 returns to the intermediate position. Further, since the engaging element 92 in the cam groove 91 moves from b to c in the cam mechanism 90, the slider 8 for the ignition device held on the slider holding plate 26 via the cam mechanism 90
0 also returns to the intermediate position. As a result, the ignition device is turned off.

When the operating rod 20 locked at the intermediate position is pressed forward again, as shown in FIG. 7B, the engaging element 3 in the cam groove 31 in the push / push mechanism 30 is pressed.
As 2 moves from C to D, the operating rod 20 moves forward to the stroke end. The slider holding plate 2
The slider 70 for the main circuit directly held at 6 also advances following the operating rod 20. However, the slider 80 for the ignition device held by the slider holding plate 26 via the cam mechanism 90 remains at the intermediate position because the engaging element 92 in the cam groove 91 moves largely from c to d in the cam mechanism 90. . Therefore, the ignition device is not turned on even though the operating rod 20 advances to the stroke end.

Since the operating rod 20 moves to the stroke end by the second pushing operation, even if the operating rod 20 is pressed with a strong force, a large force is not applied to the engaging element 32 of the push-push mechanism 30. Therefore, the engaging element 32
Is protected. In addition, since the pushing amount of the operating rod 20 is increased, there is no collision at the time of operation, and the sense of certainty is increased. Furthermore, since the engaging element 32 is rotated with a large stroke,
Its operation is also reliable.

When the second pushing force is removed, the push-push mechanism 30 engages the engaging element 3 in the cam groove 31.
When 2 returns from D to A, the operating rod 20 returns to the initial position. Further, the slider 70 for the main circuit directly held by the slider holding plate 26 also follows the operation rod 20 and returns to the initial position. In the cam mechanism 90, when the operating rod 20 returns from the stroke end to the intermediate position, the engaging element 9
2 returns from d to a, and thereafter, the slider 80 for the ignition device is pushed by the engagement element 92, and the slider 80 returns from the intermediate position to the initial position. Thus, the main circuit and the safety device are turned off.

In the present ignition switch, the cam groove 31 of the push / push mechanism 30 is provided on the operation rod 20 side, and the engaging element 32 is provided on the case 10 side. Side, and the engaging element 32 is attached to the case 10
May be provided on the side of.

Similarly, in the second cam mechanism 90,
It is also possible to provide the cam groove 91 on the side of the operating rod 20 and provide the engaging element 92 on the side of the slider 80.

FIG. 8 is a vertical sectional front view showing the structure of one example of the second ignition switch according to the present invention, FIG. 9 is a partially cutaway bottom view of the ignition switch, and FIGS. It is a schematic bottom view which shows operation | movement.

This ignition switch differs greatly from the above-described ignition switch in the positional relationship between the cam groove 31 and the engaging element 32 in the push-push mechanism 30 and the structure of the slider 80 for the ignition device. Are substantially the same, and only greatly different parts will be described in detail.

The cam groove 31 of the push / push mechanism 30
Is the first of the case 10 that houses the main body 21 of the operating rod 20.
It is formed on the lower surface of the housing 12. The shape of the cam groove 31 is a symmetrical heart shape like the above-described ignition switch. However, the front and rear of the cam groove 31 are reversed in the pressing direction.

The engaging element 32 is elastically held by a spring (not shown) below the main body 21 of the operating rod 20. Accordingly, the engaging element 32 moves together with the operating rod 20, but the cam groove 31 does not move. The engaging element 32 is a metal rod whose both ends are bent upward, and the front end is an operating point,
The rear end is a pivot point. The rear end, which is the pivot of the engagement element 32, is inserted into the lower surface of the rear end of the main body 21. The front end, which is the operating point, is elastically inserted into the cam groove 31 through a slit 85 of a slider 80 described later.

The slider 80 for the ignition device is the case 1
It is held on the 0 side. That is, the slider 80
Is the first of the case 10 that houses the main body 21 of the operating rod 20.
A U-shaped cross-section fitting portion 82 that fits into the housing portion 12 from below.
An arm 83 extending laterally from the fitting portion 82;
3 and a brush holding portion 84 integrally formed at the tip end. A pair of protrusions 82a,
82a are provided. The projections 82a, 82a
It is fitted in grooves 12a, 12a provided on both side surfaces of the housing 13. Thereby, the slider 80 can reciprocate in the pressing direction of the operation rod 20.

On the bottom surface of the fitting portion 82 of the slider 80,
A slit 85 is provided. The slit 85 has a hook shape in which a half of the Y-side of a horizontally long straight line XY orthogonal to the pressing direction of the operating rod 20 is extended in a right-angled triangular shape forward in the pressing direction as a relief portion. Then, an end of the engaging element 32 provided on the operation rod 20 side is elastically inserted into the cam groove 31 provided on the case 10 side through the slit 85.

The brush holding portion 84 of the slider 80 is provided with the main circuit slider 7 directly held on the side of the operating rod 20.
The brush 81 for the ignition device is arranged on the upper surface and arranged on the outer side. The brush 81 for the ignition device provided on the upper surface of the brush holding portion 84 and the brush 71 for the main circuit provided on the upper surface of the slider 70 come into contact with the lower surface of the substrate 60 fixed to the case 10 side. I have.

Cam groove 31 of push / push mechanism 30
Is provided on the case 10 side, and the engaging element 32 is
However, since the cam groove 31 has a symmetrical heart shape, the operating rod 2 is locked at an intermediate position.
When the 0 is pushed forward again, the operation lever 20 moves to the stroke end as in the case of the ignition switch described above.

FIG. 10A with the operating rod 20 in the initial position.
In the state described above, the engaging element 32 attached to the operating rod 20
Is located between the X end and the Y end.

As shown in FIG. 10B, when the operating rod 20 is pushed from the initial position to the stroke end, the position of the engaging element 32 in the slit 85 moves from the middle between the X end and the Y end to the X end. . Therefore, in the first depression of the operating rod 20, the slider 80 for the ignition device moves forward following the operating rod 20. Therefore, the ignition device is turned on. The main circuit slider 70 directly held on the side of the operating rod 20 also moves forward following the operating rod 20, so that the main circuit is also turned on.

When the pushing force applied to the operating rod 20 is removed, the operating rod 20 returns to the intermediate position as shown in FIG. The position of the engagement element 32 in the slit 85 returns from the X end to the middle between the X end and the Y end. Therefore, the slider 80 also moves back to the intermediate position following the operating rod 20, and the ignition device is turned off.

At the time of the second pressing, that is, in FIG.
As shown in (B), when the operating rod 20 locked at the intermediate position is pushed to the stroke end, the position of the engagement element 32 in the slit 85 is from the middle between the X end and the Y end to the Y end. Moving. Here, the half on the Y side of the slit 85 is extended in a right triangular shape forward in the pressing direction. Therefore, when the operating rod 20 is pushed in, only the engaging element 32 moves forward, and the slider 80 remains at the original position. Therefore, the ignition device is not turned on even though the operating rod 20 advances to the stroke end.

When the second pushing force is removed, the operating rod 20 returns to the initial position. The safety device is turned off. At this time, the position of the engagement element 32 in the slit 85 returns from the Y end to the middle between the X end and the Y end. The slider 80 is pushed by the engagement element 32 while the operating rod 20 is being retracted, and returns from the intermediate position to the initial position.

As described above, also in this ignition switch,
Since the operating rod 20 moves to the stroke end by the second pushing operation, even if the operating rod 20 is pressed with a strong force,
No large force is applied to the engagement element 32 in the push / push mechanism 30. Therefore, the engaging element 32 is protected. Also, since the pushing amount of the operating rod 20 becomes large,
There is no collision during operation, increasing the sense of certainty. Further, since the engagement element 32 is rotated with a large stroke, the operation is also ensured. Then, the ignition device is not turned on even though the operating rod 20 advances to the stroke end.

[0063]

As described above, the ignition switch according to the present invention, when the operating rod is pushed for the second time, is operated.
Since the operating rod reaches the stroke end and the engaging element in the cam groove of the push-push mechanism does not hit the groove wall, there is no possibility that the engaging element will be deformed or lifted even if the engaging element is pushed with a strong force. Further, since the stroke at the time of pushing the operating rod for the second time is long, the operating rod can be moved smoothly, and the operation feeling is good. Then, when the operating rod is pushed in for the second time, the slider is left at the intermediate position, so that the ignition device is not turned on despite the operation rod reaching the stroke end.

A second slider which moves following the operating rod is provided side by side with a floating type slider, a brush for a main circuit is mounted on the surface of the second slider, and a contact pattern with which the brush comes into contact is formed on a substrate. When formed on the surface, the substrate is shared by the ignition device and the main circuit, so that the device configuration is simple.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an entire structure of an example of a first ignition switch according to the present invention.

FIG. 2 is a schematic longitudinal sectional side view showing a state where the ignition switch is combined with a gas valve.

FIG. 3 is a vertical sectional front view of the ignition switch.

FIG. 4 is a partially broken bottom view of the ignition switch.

FIG. 5 is an enlarged view showing a shape of a cam groove.

FIG. 6 is a schematic bottom view showing the operation of the ignition switch.

FIG. 7 is a schematic bottom view showing the operation of the ignition switch.

FIG. 8 is a longitudinal sectional front view showing the structure of an example of a second ignition switch according to the present invention.

FIG. 9 is a partially cutaway bottom view of the ignition switch.

FIG. 10 is a schematic bottom view showing the operation of the ignition switch.

FIG. 11 is a schematic bottom view showing the operation of the ignition switch.

FIG. 12 is an enlarged view showing the shape of a conventional cam groove in a push / push mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas valve 3 Main valve 4 Electromagnetic safety valve 10 Case 15 Substrate support part 20 Operation rod 26 Slider holding plate 30 Push / push mechanism 31 Cam groove 32 Operation rod 40 Spring 50 Support frame 60 Substrate 70 Slider (second slider) 71 Brush 80 Slider (floating slider) 81 Brush 85 Slit 90 Second cam mechanism 91 Cam groove 92 Operating rod

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23N 1/00 102 F23N 5/26

Claims (6)

(57) [Claims] 1. An ignition switch provided on a press-type gas valve of a gas appliance and also serving as a press-operation device of the gas valve, wherein a case fixed to the press-type gas valve;
An operating rod capable of reciprocating in the pressing direction in the case, a heart-shaped cam groove on one of the case and the operating rod, and an engaging element elastically inserted into the cam groove on the other; A push-push mechanism that locks the return operation from the stroke end to the initial position at the intermediate position and releases the lock at the intermediate position by re-advancing from the intermediate position, and moves relative to the moving direction of the operating rod. A floating slider having a brush for an ignition device on its surface, and fixed to a case facing the slider,
A substrate on which a contact pattern for contacting the brush is formed, and a re-advancing path of the cam groove in the push-push mechanism is extended so that the operating rod reaches its stroke end when the operating rod is re-advanced. A second cam groove is provided on one of the operating rod and the slider, and a second engaging element elastically inserted into the second cam groove is provided on the other. A relief portion is formed in the second cam groove to guide the second engagement element and move the slider relative to the operation rod in a direction opposite to that of the operation rod. An ignition switch characterized in that the slider is moved to follow and the slider is left at an intermediate position when the operating rod is re-advanced. 2. A second slider which moves following the operating rod is provided side by side with the floating type slider, a brush for a main circuit is mounted on a surface of the second slider, and a contact point with which the brush contacts The ignition switch according to claim 1, wherein a pattern is formed on a surface of the substrate. 3. A slider holding plate is protruded laterally from an operating rod, a second slider is fixed on the slider holding plate, and a floating slider is placed on a side of the second slider. 3. The ignition according to claim 2, wherein a second cam groove is provided on one of the floating type slider and the slider holding plate, and a second engaging element is mounted on the other side, and the substrates are arranged on both sliders to face each other. switch. 4. An ignition switch provided on a press-type gas valve of a gas appliance and serving also as a press-operation device of the gas valve, wherein a case fixed to the press-type gas valve;
An operating rod that can reciprocate in the pressing direction in the case, a heart-shaped cam groove on the side of the case, and an engaging element elastically inserted into the cam groove on the operating rod side; A push-push mechanism that locks the return operation from the stroke end to the initial position at the intermediate position and releases the lock at the intermediate position by re-advancing from the intermediate position, and moves relative to the operating rod in the same direction. A floating slider having a brush for an ignition device on the surface thereof, and a substrate fixed to the case opposite to the slider and having a contact pattern formed on the surface so that the brush comes into contact with the slider. The re-advancing path of the cam groove is extended so that the operating rod reaches its stroke end when the rod is re-advanced, and the engaging element is inserted into the cam groove through a slit formed in the slider, and the operating rod is A relief part is formed in the slit to guide the engaging element in the slit during re-advancement and move the slider relative to the operating rod in the opposite direction, and the slider follows the operating rod during operation excluding re-advancement from the middle position of the operating rod An ignition switch, wherein the slider is moved to leave the slider at an intermediate position when the operating rod is re-advanced. 5. A second slider which moves following the operating rod is provided side by side with said floating slider, and a brush for a main circuit is mounted on the surface of said second slider, and said brush comes into contact with said brush. The ignition switch according to claim 4, wherein a pattern is formed on a surface of the substrate. 6. A floating slider, wherein a second slider is fixed on a slider holding plate projecting sideways from the operating rod, and is protruded in the same direction as the slider holding plate, and a base is movably connected to the operating rod in the pressing direction thereof. The tip of the slider of the formula is a brush holder, and the brush holder is located on the side of the second slider.
6. The ignition switch according to claim 5, wherein a substrate is disposed on the slider.