JPS6223499Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) This invention relates to the improvement of a fire extinguisher installed in ordinary homes, buildings, factories, etc., and used for initial extinguishing of fires.

(Background Art) It is widely practiced to have a fire extinguisher installed in ordinary homes for initial extinguishing of fires. FIG. 1 shows an example of such a conventional fire extinguisher. A lid 3 attached to the top of the fire extinguishing agent container 1 with a cap nut 2 is provided with a fixed handle 4 and an activation lever 6 that is rotatable about a shaft 5. When using a fire extinguisher, pull out the safety pin 7 upwards and push down the activation lever 6, and the extinguishing agent in the extinguishing agent container 1 will be released from the extinguishing agent container 1.
It is pushed by the pressure gas inside and is ejected from the nozzle 9 at the tip of the hose 8.

By the way, in the fire extinguisher constructed and operated as described above, a bag nut 2 is attached to the upper part of the extinguishing agent container 1.
In order to fix the lid body 3, a structure as shown in FIG. 2 is adopted. That is, a short cylindrical cap 10 made of iron is fixed to the upper opening of a fire extinguishing agent container 1 made of iron by welding, and a male thread 11 carved on the outer circumferential surface of the cap 10 and a female thread on the inner circumferential surface of the cap nut 2 are connected. 1
2 are screwed together to fix the lid body 3 to the base 10. 13 is the gas cylinder 14 when starting the fire extinguisher
This packing is for preventing the pressure gas introduced into the fire extinguishing agent container 1 from leaking to the outside.

However, when a fire extinguisher having such an iron cap 10 is installed outdoors, in the kitchen, or other places where rainwater is likely to splash, moisture entering from below the cap 10 as shown by arrow a in FIG. The male thread 11 on the outer circumferential surface of the cap will corrode. The same applies when fire extinguishers are installed in places where they come into contact with corrosive gases, such as in factories. Although the packing 13 can prevent moisture that has entered the threaded portion from further entering the fire extinguishing agent container 1 and dampening the fire extinguishing agent in the container 1, it does not serve to prevent corrosion of the threaded portion. .
If the male thread 11 on the outer circumferential surface of the cap is corroded in this manner, it becomes impossible to loosen the cap nut 2, and it becomes impossible to refill the extinguishing agent whose expiration date has passed. If the cap 10 is made of stainless steel, this inconvenience can be overcome, but this is not preferable because it increases the manufacturing cost of the fire extinguisher.

In order to eliminate such inconveniences, the present inventor first installed a packing member 15 made of an elastic material such as rubber into a short cylindrical shape as shown in FIG. It can be installed between the top surface and the bottom surface of the cap nut 2 (Utility Application No. 162005/1988, Patent Application No. 71238/1989), or it can be installed on the outer peripheral surface of the cap nut 10 as shown in Fig. 5. By bringing the O-ring 17 fitted into the groove 16 into elastic contact with the inner peripheral surface of the lower part of the cap nut 2 (Utility Application No. 58-162006, Utility Model Application No. 60-71239),
A structure has been devised that can prevent moisture from entering the threaded portion between the cap nut 2 and the cap 10 from below the cap nut 2, as shown by arrow a in FIG.

However, in each of the above-mentioned ideas, Fukuronatsu 2
Even if it is possible to prevent moisture from entering the threaded portion between the cap and the cap 10 from below, it is still not possible to completely prevent the threaded portion from rusting. That is, as shown in FIG. 6, the cap nut 2 of the fire extinguisher is
A small circular hole 18 is provided for releasing the pressure gas remaining in the extinguishant container 1 to the outside when the extinguishant container 1 is loosened. This small circular hole 18 is designed to prevent the pressure gas venting screw (not shown) installed on the lid 3 from being loosened by mistake when removing the lid 3 for refilling the extinguishing agent container into the extinguishing agent container. It is required by the ministerial ordinance that stipulates the regulations for fire extinguishers to provide a fire extinguisher so that even if the cap nut 2 is loosened while pressure gas remains inside, the cover 3 will not be blown off and cause injury. ing.
Since the small circular hole 18 has a small cross-sectional area, this small circular hole 1
The amount of moisture that enters the threaded part through 8 is smaller than the amount of moisture that enters from below as shown by arrow a in Figure 2, but in the case of a fire extinguisher that is left outdoors for a long time, this small amount Unless moisture and the like enter through the circular hole 18, the threaded portion cannot be completely rust-proofed.

(Purpose of the invention) The object of the invention is to provide a fire extinguisher that can eliminate the above-mentioned inconveniences and completely prevent moisture from entering the threaded portion between the cap and the cap nut.

(Structure of the invention) The fire extinguisher of the invention has a cap made of an elastic material such as rubber fitted into a small circular hole provided in a cap nut to prevent moisture from entering the small circular hole. .

To explain in more detail with reference to the drawings, the cap 19 attached to the small circular hole 18 has a flange 2 at one end of the short cylindrical portion 20, as shown in FIG.
1 is formed. The diameter of this short cylindrical portion 20 is
In the free state, it is formed to be slightly larger than the inner diameter of the small circular hole 18, and its length is formed to be slightly smaller than the thickness of the cap nut 2. Also, flange 21
The diameter of the cap nut 2 is set to be the same as or slightly smaller than the interval between the spanner ridges 22, 22 formed on the outer peripheral surface of the cap nut 2. For this reason, if the short cylindrical portion 20 is pushed into the small circular hole 18 on the side surface of the cap nut 20 while elastically reducing its diameter, the cap 19 can be inserted into the small circular hole 18 with the flange 21 in close contact with the outer peripheral surface of the cap nut 2. Hole 18
will be installed on the In this state, the small circular hole 18
The short cylindrical portion 20 of the cap 19 is press-fitted inside.
Since the inner circumferential surface of the small circular hole 18 and the outer circumferential surface of the short cylindrical portion 20 are in close contact, moisture and the like will not pass through the small circular hole 18. Intrusion of moisture and the like from below the cap nut 2 is prevented by the structure shown in FIGS. 4 and 5 described above.

The shape of the flange 21 of the cap 19 is as follows:
It is not limited to a circular shape as shown in FIG. 7, but may be an elongated rectangle with a width that allows it to freely enter between the ridges 22, 22 on the outer peripheral surface of the cap nut as shown in FIG. 8, or as shown in FIG. The surface opposite to the short cylindrical portion 20 may be a spherical surface as shown in FIG.

Such a cap 19 is usually attached to the small circular hole 18 and prevents moisture etc. from entering the threaded portion of the cap nut 2 and the cap 10 through the small circular hole 18, but it is not When the cap nut 2 is loosened with pressure gas remaining in the container 1, the short cylindrical portion 20 is pushed out from the small circular hole 18 by the pressure gas leaking inside the cap nut 2, and the inside of the extinguishant container 1 is pushed out. The pressure gas is released to the outside through the small circular hole 18. Therefore, even if the cap nut 2 is loosened without releasing the pressure gas in the fire extinguisher container 1, the lid 3 is prevented from being blown off by the pressure gas, as in the conventional case.

(Effect of the invention) Since the fire extinguisher of the invention is constructed as described above, moisture etc. can enter the threaded portion between the mouthpiece 10 of the extinguishing agent container 1 and the cap nut 2 without particularly increasing the production cost. However, corrosion of this threaded portion can be completely prevented.

(Application example) Incidentally, if characters such as "decompression hole" and "do not pull out" are attached to the outer surface of the flange 21 of the cap 19, it is possible to prevent the cap 19 from being removed by mistake. Furthermore,
By attaching a message such as "inspection required" to the outer surface of the cap nut 2 that is hidden by the flange 21 of the cap 19, it is possible to prevent the fire extinguisher from being left unattended with the cap 19 removed.

[Brief explanation of the drawing]

Figure 1 is a side view showing an example of a fire extinguisher to which the present invention is applied, Figure 2 is a longitudinal sectional view of the upper part of Figure 1, and Figure 3 is a vertical cross-sectional view of the upper part of Figure 1.
The figure is a perspective view of a packing member for corrosion prevention.
Fig. 4 is a partial longitudinal sectional side view showing this packing attached to a fire extinguisher, Fig. 5 is a longitudinal sectional view similar to Fig. 2 showing another anti-corrosion structure, and Fig. 6 is a perspective view of the cap nut. Figures 7-9 show three examples of caps to which the fire extinguisher of the present invention is attached, with Figures 7-8 being a perspective view, and Figure 9 a side view. 1: Fire extinguisher container, 2: Bag nut, 3: Lid body,
4: Handle, 5: Shaft, 5: Starting lever, 7: Safety pin, 8: Hose, 9: Nozzle, 10: Base, 1
1: Male thread, 12: Female thread, 13: Packing,
14: Gas cylinder, 15: Packing member, 1
6: Groove, 17: O-ring, 18: Small circular hole, 19:
Cap, 20: Short cylindrical part, 21: Flange, 2
2: Ryujo.

Claims (1)

[Scope of utility model registration request] A short cylindrical iron cap with a male thread carved on the outer circumferential surface is welded to the upper opening of the extinguishing agent container, a lid body equipped with a fire extinguisher activation mechanism is placed on top of this cap, and the outer circumference of the cap is In a fire extinguisher whose lid is fixed to the cap with a cap nut that screws into the male thread on the face,
A fire extinguisher which maintains watertightness between the lower outer circumferential surface of the cap and the lower inner circumferential surface of the cap nut, and has a cap made of an elastic material press-fitted into a small circular hole drilled in the side surface of the cap nut.