JPS6120368Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an automatic gas shutoff device that detects gas leaks and earthquakes and shuts off gas. The applicant filed Utility Application No. 55-59084, No. 55-17609, No. 17609, No.
56-162590, a weight is placed on a shelf installed in the case, and in the event of an earthquake, the weight falls off the shelf, and
In the event of a gas leak, a gas leak detector detects a gas leak and emits an electrical signal that excites a solenoid to force the weight to fall off the shelf, or toppling the shelf and causing the weight to fall. We proposed a gas cutoff device that uses falling gas to close the gas valve. Of course, these preceding devices function satisfactorily and shut off the gas, but after the gas is shut off, in order to open the gas valve, it is necessary to open the case and place the fallen weight on the shelf again. It takes time to open and close the case. Therefore, the present invention was made so that the weight could be returned to its original position from outside the case without having to open and close the case each time, and the gas valve could be opened to use the gas. Explain.

Reference numeral 1 is a vertically elongated case, on one side of which a pillar 2 is vertically erected, a cutoff spring 3 made of a strong coil spring is fitted into the pillar 2, the upper end of which is fixed to the upper end of the pillar, and the lower end is fixed to the upper end of the pillar. connects wire 4. The wire 4 comes out from the lower surface of the case 1, and its tip is connected directly to a gas valve, for example, a main stopper provided in a gas pipe, or to an operating part that rotates a cylinder of propane gas or the like. To open the gas valve, the shutoff spring 3 is extended downward by a wire 4, and the lower end of the spring is engaged with an actuating piece 5 pivotally connected to the lower end of the column to maintain the shutoff spring in the extended state. Then, in the event of an earthquake or gas leak, the actuating piece is made free, the force of the shutoff spring contracting upward releases the engagement with the actuating piece, and the main valve or operating part is pulled and rotated via the wire 4. , blocking the gas flow is the same as the prior art. Note that 3' indicates a hook provided at the lower end of the cutoff spring 3 for hooking onto the actuating piece 5.

The actuating piece 5 is formed through a slit 2' at the lower end of the column 2.
In this embodiment, the screw 2a is attached to the case by separating the lower end of the support from the back wall 1' of the case 1 via a spacer 2b. It also serves as a fixing device. The purpose of separating the support column from the back wall 1' is to allow the blocking spring 3 to expand and contract without coming into contact with the case back wall 1'. The actuating piece 5 has a claw 5a that locks the hook 3' at the lower end of the spring on the part protruding from the left side of the column.
In addition, the part protruding from the right side of the column also has claws or jaws (for convenience, referred to as jaws) 5b.
At the lower part of the back wall of the case, there is an operating rod 6 on the right side of the column, which is equipped with a hook 6' at the lower end that engages with the jaw 5b.
The hook 6' is pivoted and pulled to the right by a weak spring 7 above the fulcrum of the operating rod 6, thereby biasing the hook 6' into engagement with the jaw 5b.

Therefore, when the gas valve (the above-mentioned main valve) is turned to open, the wire 4 is pulled and the shutoff spring 3
is extended downward, and just before the gas valve is almost completely opened, the hook 3' pushes the protrusion from the right side of the column of the operating piece 5, and when the gas valve is completely opened, the hook 3' is lowered into the claw 5a. The actuating piece attempts to rotate clockwise in an attempt to contract upward. As a result, the right jaw 5b engages the hook 6' of the actuating rod from above, and the actuating rod 6 prevents the actuating piece from rotating clockwise and maintains the cutoff spring 3 in its downwardly extended state. In addition, the hook 3' of the cutoff spring passes downward while climbing over the left side of the actuating piece, and the hook 3'
At this time, if the actuating piece is rotated slightly clockwise, a spring 6c should be stretched between the fulcrum of the actuating rod 6 and the left side of the actuating piece, or a support or screw should be used. It is preferable to attach a spring to 2a to slightly bias the actuating piece counterclockwise, and as soon as the hook passes, return the actuating piece to its original position so that the hook is hooked on the pawl 5a. In this embodiment, since the rod is attached to the weight downward, one or more guide pieces 8 are provided in the lower part of the rear wall of the case, to the right of the operating rod 6, facing forward, and the lower surface of the case and this guide piece are provided. The piece has holes 9 arranged vertically in a straight line,
9' will be opened. In this embodiment, the guide piece 8 is formed by the upper and lower legs of a U-shaped plate 8' which is bent into a U-shape and attached to the back wall. A long rod 11 attached downward to the weight 10 is connected to a hole 9 aligned vertically.
The rod 11 is passed through the rod 9' in a series so as to be movable in the vertical direction, and the lower end of the rod 11 is provided with an engaging portion 11' that is hooked on the edge of the hole 9 or 9'. Although the engaging portion 11' is formed here as a hook-shaped notch, it may also be a protrusion, and when this engaging portion 11' is hooked onto the edge of the hole 9' in the lower guide piece, the rod 11 is attached to the weight 10. is located at the top of the case to prevent it from moving downward. It is preferable to provide a stopper 11a at the lower end of the load so that the stopper 11a abuts the lower surface of the case from below when the engaging portion 11' is hung on the edge of the hole 9'. The tension between the engaging part 11' and the hole fixes the case vertically to the wall of the building, and when the building shakes due to an earthquake of a certain magnitude, the weight shakes and the rod 11 is moved to create the tension. It is set to the extent that it is removed. This can be determined by the depth of the notch or, in the case of a protrusion, the amount of protrusion.

A release piece 12 is pivotally attached to the front end of the lower guide piece 8 in a hole 9' for pushing the lower part of the rod 11, which is suspended by the engaging portion 11', forward from behind to release the suspension. The release piece 12 has a lateral arm 12' at the rear that pushes the lower part of the rod 11 from behind, and its rear end is connected to the excitation rod 13' of the solenoid 13 by a connecting rod 14.

This solenoid 13 is electrically connected to a gas sensor 16 that monitors gas leaks in a building, for example, in a kitchen, via a normally closed micro switch 15 located directly above the upper guide piece 8 and fixed to the back wall of the case. There is. Therefore, when the gas sensor 16 detects a gas leak, the solenoid 13 is activated via the micro switch 15.
The solenoid is energized and the energizing rod 13'
, and the excitation rod 13' is connected to the release piece 12 with the connecting rod 14.
Pull up the rear end and force the arm 12' to push the lower part of the rod forward to release the hook from the hole 9' of the engaging part 11' (FIG. 5). As a result, the weight 10 is placed in the hole 9,
9' guides the rod 11 and lowers it through the case (dashed line in Figure 2).

Reference numeral 17 denotes a sliding rod whose upper end is pivotally attached to the upper part of the back wall of the case, and a sliding rod 17' which protrudes laterally at its lower end and comes into contact with the upper end of the operating rod 6 pulled by a spring 7.
The sliding rod tries to hang down due to gravity from the upper end to which it is pivoted, but since the locking piece 17' is in contact with the upper end of the operating rod 6, it tilts to the right, and the lower half is suspended by a weight. 10 rushes into the path of descent.
The upper guide piece 8a also serves as a stopper for receiving the upper part of the operating rod 6 pulled by the spring 7. Therefore, the tension of the engaging portion 11' of the rod 11 against the hole 9' will naturally come off due to the shaking of the weight caused by the earthquake, as described above, or the gas sensor will detect a gas leak and the release piece 12 will be released. When the weight 10 is actuated and forcibly removed by the release piece, the weight 10 guides the rod through the holes 9 and 9', and as it falls, it pushes the sliding piece 17 to the left and swings it, causing the locking piece 17' to move. Push the upper end of the operating rod 6 to the left (dashed line in Figure 2). As a result, the operating rod 6 rotates counterclockwise against the spring 7, and the hook 6'
is removed from the jaw 5b of the actuating piece 5, so that the actuating piece 5 can freely rotate, and the cutoff spring 3, which has been extended downward and hooks the hook to the claw 5a of the actuating piece, rotates the actuating piece. The hook is removed from the claw 5a and contracted upward, and at this time, the wire 4 is pulled by the contracting force to close the gas valve and cut off the flow of gas.

Also, as in this embodiment, the weight 10 eventually falls onto the actuator 15' of the micro switch 15, and if the actuator 15' is retracted and the micro switch 15 is turned off, gas leakage can be detected. When the weight is dropped, the power supply from the gas sensor to the solenoid is stopped, which prevents the solenoid from burning out.

According to the present invention, when the gas supply is cut off due to an earthquake or a gas leak, the rod 11 protrudes long from the bottom or top of the case. It can be easily determined that it has been activated by the protrusion of the rod.

Then, lift the rod from the lower end and
1' is pulled into the hole 9', the weight 10 moves upward, and the spring 7 pulls the upper part of the operating rod 6 again to bring the hook 6' into engagement with the jaw 5b of the operating piece.
The lower part of the sliding piece 17 is plunged into the descending path of the weight to prepare for the next time (Fig. 4). Therefore wire 4
The cutoff spring is stretched by pulling the cutoff spring downward, and the hook at the lower end of the cutoff spring is hung on the claw 5a of the actuating piece. By opening the gas valve, gas can be used and the wire is no longer slack. Incidentally, stretching the cutoff spring by pulling the wire downward and hooking the hook at the lower end of the spring to the claw piece 5a can also be done by opening the gas valve.

In this embodiment, the engaging part 11' of the rod 11 is provided on the rearward side of the rod, but the release piece 12 moves the lower part of the rod backwards or sideways, so that the engaging part 11' can be moved forward or backwards toward the rod. It can also be formed horizontally. Also, the engaging part 1 of the rod
The hole 9' to which 1' is suspended is a hole drilled in the lower guide piece here, but it may also be a hole in the upper guide piece or the lower surface of the case. It is preferable that the rod 11 has a cross-sectional shape other than a circle so that it cannot rotate in the holes 9, 9', but when the rod 11 has a circular cross-section, a fitting part 18 surrounding the stopper 11a is provided on the bottom surface of the case. If the direction of the engaging part 11' is not correctly oriented with respect to the release piece, the stopper 1 will not move even if the rod is raised.
It is preferable that 1a is made so that it cannot come into contact with the lower surface of the case when it comes into contact with the fitting part, so that it can be seen that the direction of the engaging part is not correct. Further, the open front surface of the case is covered with a lid, preferably a lid through which the inside can be seen, for maintenance, repair, etc. Furthermore, the wire 4 passes through a flexible outer tube 4', one end of the outer tube 4' is attached to the bottom surface of the case, the other end is attached to a retainer 19 fixed to a gas pipe or cylinder, and the wire is It extends from the other end of the outer tube and is connected to the operating part of a gas valve or propane gas cylinder. Furthermore, when the engaging portion 11' is hooked to the edge of the hole, the rod 11 tilts with respect to the vertical as shown in FIG. The hole through which the rod passes below the hole on which the engaging part 11' is pulled, in this embodiment the hole 9 on the bottom surface of the case, is made to be almost vertical. The edge 9a facing the engaging part 11' is designed to prevent the rod from stopping its downward movement when the rod is suspended, and to tilt the rod with respect to the vertical when the engaging part 11' is suspended in the upper hole 9'. It is a good idea to move it a little away from the rod. Furthermore, the rod is attached to the weight 10 upward rather than downward, and a guide piece 8 and a release piece 12 are provided in the upper part of the case, and the rod is formed at the upper part of the rod by penetrating the upper surface of the case and protruding upward. The engaging portion may be hooked to a guide piece or a hole on the top surface of the case, and the weight may be suspended in the upper part of the case, and the hook may be released and dropped in the event of an earthquake or gas leak. In this case, pull up the weight by holding the upper end of the rod that protrudes upward from the top surface of the case, and then pull the engaging part into the hole.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the equipment state of an embodiment of the present invention, Fig. 2 is a front view of the same main part with the gas valve open, Fig. 3 is a longitudinal side view of the same, and Fig. 4 Fig. 5 is a front view of the same as above with the weight returned and the gas valve still closed, and Fig. 5 is an enlarged sectional view showing the state where the engaging part of the above rod is pulled into the hole.
1 is a case, 3 is a cutoff spring, 4 is a wire, 5 is an operating piece, 8 is a guide piece, 9 and 9' are holes, 10 is a weight, 11 is a rod, 11' is an engaging part thereof, and 13 is a solenoid. , 16 is a gas sensor, and 17 is a sliding piece.

Claims (1)

[Scope of claim for utility model registration] Inside a box-shaped case, a weight that falls due to vibrations caused by earthquakes is connected by electrical wiring to a gas sensor outside the case that detects gas leaks, and is energized and excited by gas leaks. A solenoid that forcibly drops a weight, one end of which connects a wire that connects to the gas valve, and a shutoff spring that can pull the wire to close the gas valve, and the shutoff spring is normally in an extended state. In an automatic gas stop device that is equipped with an actuating piece that locks the gas valve and keeps it open, a rod is attached to the weight facing upward or downward, and the upper or lower part of the case is provided with the rod facing upward or downward. A guide piece is provided on the upper or lower surface of the case and a hole through which the rod can move up and down is provided in the above guide piece. A sliding piece is provided with a joint part at the bottom, and the tension is released by the vibration caused by the earthquake and the excitation operation of the solenoid, and the sliding piece releases the locking of the cutoff spring from the actuating piece by sliding based on the fall of the weight. An automatic gas stop device characterized by being provided with.