JPH09159053A - Structure of rotary type gas cock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a gas cock, whose valve is opened, from rotating in the valve closing direction even if vibration and the like is applied by installing a plate spring pressing a cam on a fixed side and forming a cam part, which converts energizing force of the plate spring into a rotating force in the valve closing direction so as to apply it to a rotation operating shaft, within the predetermined area from the valve closing position in the valve opening direction. SOLUTION: When a rotation operating shaft 2 is rotated counterclockwise, a valve is opened. While the valve is closed, an oscillation part 63 in a plate spring 6 is brought into contact with an end part, 42a serving as an angled end part of the first cam part 42, and the clockwise moment, in other words, the moment to keep the valve closing state is applied to the cam 4. When the rotation operating shaft 2 is rotated counterclockwise, the contact point between the end part 42a and the oscillation part 63 is shifted in the point end direction of the oscillation part 63, and the direction of stress working from the oscillation part 63 to the end part 42a is directed toward the center of the rotation operating shaft 2, and as a result, the moment is reduced. If a contact point with the oscillation part 63 is moved from the end part 42a onto the circumferential face of the first cam part 42, the moment is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary gas cock structure for controlling a gas supply amount by a rotary operation.

[0002]

2. Description of the Related Art Conventionally, as a rotary gas cock which has a taper-shaped valve body and which rotates the valve body by a rotary operation with respect to a rotary operation shaft to increase or decrease the gas supply amount to a burner, for example, According to Japanese Utility Model Publication No. 57-47499, a coiling spring for urging the rotary operation shaft in the valve closing direction is attached, and it is caused by an assembling clearance of a mechanism portion connecting the rotary operation shaft and the valve body. It is known that the rotary operation shaft is biased and held in the valve closing direction so that the sticking does not occur at the valve closing position.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
Since the biasing force of the spiral spring in the valve closing direction always acts on the rotation operation shaft, when vibration etc. acts on the gas cock in the valve open state, the rotation operation shaft is rotated in the valve closing direction by the biasing force, and There is a risk that the supply amount will decrease arbitrarily.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary gas cock that solves such a problem.

[0005]

In order to solve the above-mentioned problems, the present invention is a structure of a rotary gas cock which controls a gas supply amount by a rotary operation, and a cam is attached to a rotary operation shaft of the gas cock. At the same time, a leaf spring that presses against the cam is attached to the fixed side, and the urging force of the leaf spring is converted to a turning force in the valve opening direction on the rotating operation shaft over a predetermined range from the valve closing position to the valve opening direction. It is characterized in that a cam portion to be acted upon by is formed on the cam.

Further, in the structure of the rotary gas cock for controlling the gas supply amount by the rotary operation, a leaf spring is attached to a rotary operation shaft of the gas cock, and a cam facing the leaf spring is attached to a fixed side. A cam portion is formed in the cam for converting the biasing force of the leaf spring into a turning force in the valve opening direction and acting on the rotation operation shaft over a predetermined range from the valve closing position to the valve opening direction. And

The urging force acting on the rotary operation shaft by the cooperation of the cam portion formed on the cam and the leaf spring does not work when the rotary operation shaft is rotated by a predetermined amount in the valve opening direction. Therefore, since the urging force in the valve closing direction does not act on the rotating operation shaft that has been rotated a predetermined amount and is in the valve open state, the rotating operation shaft does not rotate in the valve closing direction without permission even when vibration or the like is applied. It does not move.

The leaf spring may be attached to the rotary operation shaft side and the cam may be attached to the fixed side.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIGS. 1 to 3, reference numeral 1 denotes a gas cock main body for increasing / decreasing a gas supply amount, and a gas inlet 11 and an outlet 12 are opened. Further, inside the gas cock body 1, a safety valve 13 which is opened and held by a magnetic force of an electromagnet contained therein, and a tapered valve body 14 for increasing / decreasing a gas flow rate are arranged. Also,
A pin 15 that engages with a slit groove 21 provided at the lower end of the rotary operation shaft 2 is integrally connected to a retainer 16, and the pin 15 has a cam groove 17 provided on the inner peripheral surface of the movable body 17.
d. The upper surface of the movable body 17 is formed with two cam protrusions 17b which are gradually lowered in the counterclockwise direction. When the rotary operation shaft 2 is rotated in the counterclockwise direction, a rotational force acts on the movable body 17 via the pin 15. The movable body 17 descends while coming into contact with the lower surface of the bracket plate 3 while the cam projection 17b on the upper surface thereof projects above the two openings 3a provided in the bracket plate 3. The movable body 17 is the valve body 1.
4, the spline part 17a hanging from the movable body 17 is always engaged with the two engaging grooves 14b provided on the upper surface of the valve body 14 even if the relative distance in the vertical direction changes with respect to the movable body 1.
The valve body 14 is also rotated in conjunction with the rotation of 7. The pin 15 of the retainer 16 engages with the bulging portion 17d1 of the cam groove 17d during the counterclockwise rotation during the ignition operation, and the retainer 16 descends in conjunction with the lowering of the movable body 17 as the movable body 17 rotates. Push down the press door 18. The safety valve 13 is located below the push button 18, and when the push button 18 descends, the safety valve 13 is forcibly opened. By the way, the engagement of the cam groove 17d of the pin 15 with the bulging portion 17d1 is configured to be released when the counterclockwise turning force with respect to the rotary operation shaft is removed.
When ignition to the burner (not shown) is completed and the counterclockwise turning force acting on the rotary operation shaft 2 is released, the pin 15 moves to the cam groove 1
7d rises to the normal portion 17d2 by the urging force of the spring 16a which is contracted and disengaged from the bulging portion 17d1. Then, the retainer 16 and the presser 18 are also pulled up,
Although the forced opening of the safety valve 13 is released, the safety valve 13 is maintained in the open state by thermoelectromotive force from a thermocouple (not shown). By the way, a valve hole 14a is formed in the valve body 14, and an opening 12a connected to the outlet 12 and the valve hole 14a are formed.
The flow rate of gas flowing out from the outlet 12 increases or decreases depending on the amount of overlap with a. The bracket plate 3 is screwed to the upper end of the gas cock body 1, and the rotary operation shaft 2 is rotatably held by a gate-type presser 5 which is fixed to the bracket plate 3 by caulking. ing. A cam 4 is fitted on the rotary operation shaft 2, and a cam 4 is attached to the holding tool 5.
A leaf spring 6 that engages with is attached.

Referring to FIG. 4, the rotary operation shaft 2 has a cross section D.
Shaped engaging shaft portion 24 is formed, the rotation operating shaft 2 is inserted into the D-shaped engaging shaft hole 41 penetrated by the cam 4, and the engaging shaft portion 24 and the engaging shaft hole 41 are connected. Rotation operation shaft 2 through cooperation
And the cam 4 are connected so as to rotate integrally. A flange portion 23 is formed on the rotation operation shaft 2 above the engagement shaft portion 24, and the upper surface 44 of the cam 4 prevents the cam 4 from moving upward by the flange portion 23. . A shaft portion 22 is formed above the flange portion 23, and the pressing tool 5 is inserted with the rotation operation shaft 2 inserted in the cam 4.
When the is set from above, the bearing hole 51 opened in the presser foot 5
And the shaft portion 22 are engaged with each other, and the rotation operation shaft 2 is rotatably held. Notches 53 for positioning are formed on both sides of the leg portion 52 of the retainer 5. The leaf spring 6 has an engaging portion 6
1 is formed, and the leaf spring 6 is locked to the retainer 5 with the locking portion 61 sandwiching the notch portion 53. Further, a cantilever swinging portion 63 having a folding piece 64 is formed near the tip end from the locking portion 61 via the U-shaped portion 62. The U-shaped portion 6
By providing 2, the stress due to the swing of the swing portion 63 is dispersed, and the life of the leaf spring 6 is extended. On the other hand, the cam 4 is formed with a first cam portion 42 on the upper stage and a second cam portion 43 on the lower stage. When the leaf spring 6 is attached to the notch portion 53, the swinging portion 63 is attached to the first cam portion 42. It is pressed. In addition, the folded piece 64
Is the second swinging part 63 facing the upper surface 44 of the cam 4
The cam portion 43 is prevented from being displaced. Second cam portion 43
Is for turning on the micro switch 7 for ignition, as shown in FIG.

FIG. 5 shows the case where the gas cock is closed, and the valve is opened when the rotary operation shaft 2 is rotated to the left.
In the valve closed state, the swinging portion 63 of the leaf spring 6 has the first cam portion 42
It comes into contact with the end portion 42a, which is a square end portion, and applies a moment to the cam 4 in the clockwise direction, that is, a moment in the direction of maintaining the valve closed state. When the rotating operation shaft 2 is rotated to the left, the contact point between the end portion 42a and the swinging portion 63 becomes the swinging portion 6.
3 in the direction of the tip end, and accordingly, from the swinging portion 63 to the end portion 4
The direction of the stress acting on 2a is directed to the center of the rotary operation shaft 2, and the moment is reduced. Then, when the point of contact with the swinging portion 63 shifts from the end portion 42a to the peripheral surface of the first cam portion 42 (when rotating about 20 ° as a predetermined range in this embodiment), the moment disappears. The turning operation shaft 2 is further turned to the left and the electromagnetic safety valve 13 is opened by the push rod 18 so that the overlapping amount of the valve hole 14a and the opening 12a is substantially maximized and the gas amount from the outlet 12 is substantially the same. Second at the maximum
The cam plate 43 pushes the switch leaf spring 71 to turn on the micro switch 7. When the micro switch 7 is turned on, an ignition device such as a sparker (not shown) is activated to ignite the burner. When the ignition is completed and the turning force to the left with respect to the rotating operation shaft 2 is released, the retainer 16 rises to pull up the push rod 18 as described above, and the cam in the movable body 17 with which the pin 15 engages. Due to the action of the groove 17d, the rotary operation shaft 2 is returned slightly to the right, the switch leaf spring 71 is disengaged from the second cam portion 43, and the micro switch 7 is turned off.

The predetermined range (20 ° in the above embodiment) in the present invention is a clearance of a mechanism portion for interlocking the rotating operation shaft 2 and the valve body 14 (slit of the rotating operation shaft 2 in the above embodiment). The clearance between the groove 21 and the pin 15 and the clearance between the pin 15 and the cam groove 17d of the movable body 17 is set to a larger angle than the rattling angle, and the movable operation shaft 2 is always closed when the gas cock is not used. The valve position is set.

In the above embodiment, the swinging portion 63 of the leaf spring 6 abuts the end portion 42a of the first cam portion 42 within a predetermined range to generate a moment in the valve closing direction. As described above, the U curved portion 63a formed at the tip of the swinging portion 63 may contact the inclined end surface portion 42b of the cam portion 42 to generate a moment in the valve closing direction within a predetermined range.

Further, as shown in FIG. 7, the cam portion 42 only needs to have an end portion 42a and an end surface portion 42b which generate a moment over a predetermined range, and the cam portion 42 does not exist outside the predetermined range. You may do it.

By the way, in the above embodiment, the rotary operation shaft 2 is used.
Although the cam 4 and the leaf spring 6 are attached to the fixed-side pressing member 5, it is also possible to attach the leaf spring to the rotary operation shaft 2 and the cam to the fixed side. 8 shows.

In this example, a ring-shaped leaf spring 8 is used, and each leaf spring 8 is formed by bending a pair of fixed portions 81 and an inclined portion 82 which is inclined so as to be lowered in the counterclockwise direction. There is. When a pair of protrusions 25 are provided on the upper surface of the flange 23 of the rotary operation shaft 2 and the leaf spring 8 is placed on the flange 23, the fixing portion 81 covers the protrusion 25 and the leaf spring 8 is prevented from rotating. Then, the holding member 5 that is a member on the fixed side is also used as a cam, and the holding member 5 has a square hole 5 that is a cam portion that engages with the inclined portion 82 when the rotation operation shaft 2 is in the valve closing position.
4 are formed. The protrusion 25 is formed slightly higher than the height of the fixed portion 81 so that when the leaf spring 8 is set on the flange 23, a gap is formed between the flange 23 and the leaf spring 8. According to this configuration, a force acts on the slope of the inclined portion 82 from the square hole 54 until the inclined portion 82 comes out of the square hole 54 from the valve closed state shown in FIG. It acts to return the shaft 2 to the clockwise valve closing direction. Then, when the inclined portion 82 comes out of the square hole 54, the force to return it is not generated. Incidentally, turning on / off of the micro switch is performed by separately providing a cam dedicated to the micro switch.

By the way, in each of the above embodiments, the movable member 7 is used.
Although the type in which the pushing operation of the push rod 18 is performed with the turning power is provided, the present invention may be applied to a so-called push-and-turn type in which the pushing operation is performed manually.

[0018]

As is apparent from the above description, according to the present invention, the gas cock is held in the closed state by the urging force of the leaf spring, but since the urging force does not act after opening the valve, the valve opening Even if vibration etc. acts in this state, the gas cock does not move freely in the valve closing direction.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a first embodiment of the present invention.

FIG. 2 is a view for explaining the operation of a cam protrusion 17b.

FIG. 3 is a view showing a shape of a cam groove 17d.

FIG. 4 is an exploded view showing a cam assembling procedure.

FIG. 5 is a plan view with the valve closed.

FIG. 6 is a plan view showing a second shape of the cam 4.

FIG. 7 is a plan view showing a third shape of the cam 4.

FIG. 8 is an exploded view showing the configuration of the second embodiment.

FIG. 9 is a cross-sectional view showing an engaged state of the inclined portion and the square hole.

[Explanation of symbols]

 1 Gas Cock Main Body 2 Rotating Operation Shaft 4 Cam 5 Presser (Fixing Plate) 6 Leaf Spring 8 Leaf Spring

Claims (4)

[Claims] 1. A structure of a rotary gas cock for controlling a gas supply amount by a rotary operation, wherein a cam is attached to a rotary operation shaft of the gas cock, and a leaf spring for pressing the cam is attached to a fixed side and closed. A cam portion is formed in the cam for converting the urging force of the leaf spring into a turning force in the valve closing direction and acting on the rotation operation shaft over a predetermined range from the valve position in the valve opening direction. The structure of the rotating gas cock. 2. When the cam exceeds the predetermined range, the urging force of the leaf spring is directed in the direction of the rotation axis of the rotation operation shaft so that the turning force in the valve closing direction does not act on the rotation operation shaft. The structure of the rotary gas cock according to claim 1, wherein: 3. The rotary gas cock according to claim 1, wherein the cam has a cam portion for turning on / off a micro switch in accordance with a phase of a rotary operation shaft. Construction. 4. A structure of a rotary gas cock for controlling a gas supply amount by a rotary operation, wherein a plate spring is attached to a rotary operation shaft of the gas cock, and a cam facing the plate spring is attached to a fixed side. A cam portion is formed in the cam for converting the urging force of the leaf spring into a turning force in the valve closing direction and acting on the rotating operation shaft over a predetermined range from the valve closing position to the valve opening direction. The structure of the rotating gas cock.