JPH0441948Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a device for opening high-pressure gas cans, and is particularly applicable to high-pressure gas in the can after a predetermined period of time has elapsed since the can is opened. Relates to a timed can opening device for later ejection.

(Prior art) For example, as a means of exterminating pests on agricultural land, conventionally, a can containing a pesticide (such as methyl bromide) and a working gas is used, and the surface of the agricultural land is covered with a covering sheet such as a vinyl film. One method is to open the can and throw it under a covering sheet, allowing the pesticide gas ejected from the can to permeate into the ground.

However, according to the above method, since pesticide gas is harmful to the human body, it is necessary to start blowing out the pesticide gas after a predetermined amount of time has elapsed after opening the can. . Also, cans filled with this type of pesticide have internal pressure at room temperature (37℃).
3.16Kg/cm ² , reaching 7.4Kg/cm ² at 60°C, so not only do we need to be careful when opening cans, but
If gas were to leak when the can was opened, it would immediately pose a hazard to humans.

Conventionally, in order to emit pesticide gas after a certain period of time as described above, a time-limited membrane that is dissolved by the pesticide is installed in the can-opening tool, and after the time-limited membrane dissolves after the can is opened, the pesticide gas is released. Timed can opening devices are known that are designed to emit a squirt.

For example, as one of the time-limited can opening tools,
There is one shown in the -145562 publication. The device disclosed in this publication uses a hollow needle as a can opening tool, provides a timer film on a member that fixedly supports the base of the hollow needle, and forms the outer periphery of the tip of the hollow needle into an arrowhead shape. The hollow needle has a structure that prevents it from coming out after being driven into the can body, and a packing plate made of rubber or the like surrounding the outer periphery of the hollow needle is tightly attached to the outer surface of the can body to prevent gas leakage.

In the can opening tool formed in this way, the hollow needle is inserted into the can body by applying the needle tip to the can body and pushing it firmly, the lower end of the packing plate prevents gas leakage, and after a certain period of time, the timer membrane closes. Dissolved pesticide gas is ejected through the hollow needle.

(Problem to be solved by the invention) However, in the above-mentioned conventional can-opening tool, the piercing needle has a hollow structure and is prevented from coming off at the outer periphery of the tip of the hollow needle. The tip needs to be shaped into an arrowhead shape, which poses manufacturing problems such as making hollow needles difficult and increasing costs.In addition, pesticide gas is ejected through the inside of the hollow needle. If a foreign object gets inside the hollow needle, there is a risk that the time limit and the ejection time of pesticide gas will become uneven. Furthermore, it is desirable to make a hole in the can body at the point where the can can be opened, but it is not easy to pierce the circumference of the round can body with the hollow needle, and if the can opening fails, agricultural chemical gas leaks and poses a serious danger to workers. There is a problem that it causes

In particular, in the above structure, after drilling, the arrow-shaped hook of the hollow needle is fixed depending on the fact that it is caught on the inner peripheral edge of the drilled hole and is prevented from coming out.
The fixation to the can is extremely unstable, and combined with the high pressure inside the can as mentioned above, there is a risk of it coming off, which poses a safety problem.

The present invention was developed with the aim of improving the above-mentioned problems of the prior art.It eliminates failures when opening cans, makes it easy to open cans, and also prevents foreign objects from entering the can body. To provide a time-limited can opening tool for a high-pressure gas can, which is free from clogging, can ensure safety after opening, has a simple structure, and can be obtained at low cost.

(Means for Solving the Problems) In order to solve the above-mentioned problems of the prior art, in the present invention, a tip engaging part that engages with the upper end winding edge of the can is provided at one end, and a lower end of the can is provided at the other end. A can opening tool main body is provided, each having a rear end engaging portion that engages with the winding edge portion, and a fulcrum portion that contacts the can body by bending the middle portion, and the tip engagement of the can opening tool main body is provided. A gas ejection hole communicating with the inner and outer surfaces is provided between the part and the fulcrum part, and a timer membrane is provided on the main body of the can opening tool to close the gas ejection hole, and a claw member and a can body protrude in a right angle direction. It is characterized by a structure in which a packing plate that can be brought into close contact with the surface is provided, and communication holes are bored in the packing plate at positions corresponding to the gas ejection holes.

(Function) With the above configuration, when opening a can, the tip engaging part of the can opening tool main body engages with the upper end winding edge of the can and presses the rear of the can opening tool main body toward the can body.
A hole is made in the can body by the claw, and the packing plate immediately comes into close contact with the can body around the hole to prevent gas leakage.Then, when the rear of the can opening tool body is pressed, the rear part bends from the fulcrum part and the rear end The engaging part can be engaged with the lower edge of the can, and as a result, the main body of the can-opening tool is fixed to the can while keeping the packing plate in pressure contact with the can body, and after a predetermined period of time, the timer membrane is is dissolved, and the gas inside the can begins to be ejected to the outside through the ejection hole and the communication hole.

(Embodiments) The present invention will be described below with reference to embodiments shown in the drawings.

Fig. 1 shows the relationship between the timed can opening tool 1 and the can 2 according to the present invention, Fig. 2 shows a side view of the timed can opening tool 1, Fig. 3 shows the back side thereof, and Fig. 4 shows a longitudinal side view of the same. , and FIG. 5 shows a cross section taken along the line of FIG. 2, respectively.

The can opening tool main body 3 in the embodiments shown in the above figures is made of an elastic metal band plate, and a tip engaging portion 5 that engages with the upper end winding portion 4 of the can 2 is formed at one end thereof. and the other end is provided with the tip engaging edge 5.
A rear end engaging portion 7 is formed which engages with the lower end winding portion 6 of the can 2 in a press-fit state when the rear end engaging portion 7 engages with the upper end winding portion 4 of the can 2 .

The can opening tool main body 3 has a longitudinally intermediate portion bent in a dogleg shape to form a fulcrum portion 9 that abuts against the can body 8 of the can 2.

The tip engaging portion 5 and the fulcrum portion 9 of the can opening tool main body 3
As shown in FIG. 4 and FIG.
A timer film 11 is attached to the inner surface of the can opening tool main body 3 so as to close the gas ejection hole 10, and a claw 12 is cut and raised at right angles on the timer film 11. A member 13 is attached, and a packing plate 14 made of an elastic material such as rubber is further attached thereon, and the claw member 13 is attached to this packing plate 14.
A communication hole 15 from which a claw 12 projects is provided. Note that in the claw member 13, a hole formed by cutting and raising the claw 12 is a communicating hole 16.

Next, the operation of the above embodiment will be explained.

When opening a can, as shown in FIG. 1, the tip engaging part 5 of the can opening tool main body 3 is engaged with the upper end winding edge 4 of the can 2, and then the rear of the can opening tool main body 3 is moved toward the can body 8 side. By pressing, the pawl 12 hits the can body 8 and perforates the can body 8, and the packing plate 14 immediately comes into close contact with the can body 8 around the perforated portion to prevent gas leakage. Next, if the rear part of the can opening tool main body 3 is strongly pressed, the fulcrum part 9 hits the can body 8 and becomes a fulcrum, and the rear part of the can opening tool main body 3 bends from the fulcrum part 9, as shown in the first figure. The rear end engaging portion 7 can be engaged with the lower end rolled edge portion 6 of the can 2 .

As a result, the timed can opening tool 1 is changed to the can opening tool main body 3.
Both the front end engaging part 5 and the rear end engaging part 7 are engaged with the upper and lower winding edges 4 and 6 of the can 2 to maintain a fixed state, and in this fixed state, the can opening tool main body 3
Due to its elasticity, the packing plate 14 is kept strongly pressed against the can body 8, and can sufficiently withstand the high gas pressure inside the can 2, so that a sealed state can be maintained reliably.

In this way, even if the can 2 is thrown under a covering sheet covering the surface of agricultural land after opening, there is no fear that the timed can opening tool 1 will come off from the can 2.

When a predetermined period of time has elapsed after the injection, the timer membrane 11 is dissolved by the gas, and the gas inside the can 2 passes through the communication holes 15 and 16 of the packing plate 14 and the claw member 13, and then reaches the gas jet hole 10 of the can opening tool main body 3. It will be sprayed to the outside.

6 and 7 show a modification of the present invention, which can be used twice.

That is, two gas ejection holes 10 ₁ , 10 ₂ are bored in the can opening tool main body 3 and spaced apart in the longitudinal direction, and a timer membrane 11 is installed in each of these gas ejection holes 10 ₁ , 10 _{2 .}
, while bending both sides of the claw member 13 upward to form a U-shaped cross section to form the gas ejection holes 10 ₁ ,
10 ₂ is slidably fitted into the can opening tool main body 3 at the portion where the nail member 13 is drilled.
Packing plates 14, 14 similar to those in the previous embodiment are attached to the upper and lower surfaces of the housing by adhesive or the like.

Therefore, when using it for the first time, the claw 12
The can is opened in the same manner as in the previous embodiment by aligning the position of the gas jet hole 101 with the position of one gas jet hole ₁₀₁ , and after the gas jetting is completed, the can is collected and removed from the can in a timely manner. can be used for the second can opening by aligning the position with the other gas ejection hole 10 ₂ . By increasing the number of gas ejection holes 10 ₁ and 10 ₂ , it is possible to use the device twice or more.

FIG. 8 shows still another modification of the present invention, in which the can opening tool main body 3 is attached to the timer membrane 11.
A part of the can opening tool main body 3 is made thinner and used as a timer film 11. This concept can be applied to the embodiments shown in FIGS. 1 to 5, and the same can be applied to the embodiment shown in FIG.

FIG. 9 shows a modification of the shape of the rear end engaging portion 7 of the can opening tool main body 3. In this example, the rear end of the can opening tool main body 3 is bent into a substantially L-shape, and this bent Piece 1
7 is further bent into a mountain shape so that its apex 17a is press-fitted and fixed to the inner periphery of the lower end winding edge 6 of the can 2. The shapes of these engaging portions 5 and 7 can be selected to be optimal for the structure of the target can 2.

Furthermore, the claws 12 may be fixed to the claw plate material 13 by welding or the like, as shown in FIG. 8, instead of being cut and raised, or may be provided directly on the can opening tool main body 3.

[Effect of idea]

As explained above, the timed opening tool for high-pressure gas cans according to the present invention has a tip engaging part that engages the upper end of the can at one end, and a tip engaging part that engages the lower end of the can at the other end. A can opening tool main body is provided, each having a rear end engaging portion and a fulcrum portion that contacts the can body by bending the middle portion, and a can opening tool main body is provided between the front end engaging portion and the fulcrum portion of the can opening tool main body. A gas ejection hole communicating with the inner and outer surfaces is bored in the can opening device, and a timer membrane for closing the gas ejection hole is provided on the main body of the can opening tool, while a pawl member that projects in a right angle direction and a packing plate that can be brought into close contact with the can body surface are provided. A communication hole is provided in the packing plate at a position corresponding to the gas ejection hole, and the tip engaging portion is engaged with the upper end of the can to open the can opening device at the rear of the can. By pressing toward the body side, the claw member makes a hole in the can body, and then by bending the rear part from the fulcrum part and engaging the rear end engaging part with the lower end winding edge of the can, the main body of the can opening tool is opened. Since it is fixed to the can, when opening the can, it can be punched with a light force by the screw action, and at the same time, even when drilling into a round can body, the nail can puncture reliably without slipping. This eliminates gas leakage due to failure in drilling, significantly increasing work safety. In addition, since the upper end engaging part and the lower end engaging part of the can opening tool body after perforation are engaged with and fixed to the upper end winding edge part and the lower end winding edge part of the can, it can sufficiently resist the internal pressure of the can.
There is no risk of gas leakage during work. Furthermore, in terms of manufacturing, the claws can be made in the form of a simple cut-and-raised shape, making them suitable for mass production and inexpensive. Furthermore, since the claw members and packing plates can be simply laminated, the overall assembly is easy. It is easy to use, does not require any special skill to use, and has excellent effects such as being able to open cans safely and reliably.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the relationship between the can opening tool and the timed opening tool for a high-pressure gas can according to the present invention, Figure 2 is a side view of the can opening tool in Figure 1, and Figure 3 is a bottom view of the same. ,
FIG. 4 is a longitudinal sectional side view of the same, FIG. 5 is a sectional view taken along the lines of FIG. 2, FIG. 6 is a perspective view showing another modified embodiment of the present invention, and FIG. FIG. 8 is a partial sectional view showing another modified embodiment of the same, and FIG. 9 is a side view showing a modified example of the rear end engaging portion. 1... Timed can opening tool, 2... Can, 3... Can opening tool body, 4... Upper end winding edge, 5... Tip engaging part,
6... Lower end winding edge portion, 7... Rear end engaging portion, 9... Fulcrum portion, 10... Gas ejection hole, 11... Timing membrane, 1
2...Claw, 13...Claw member, 14...Packing plate, 15, 16...Communication hole.

Claims (1)

[Scope of utility model registration request] A front end engaging part that engages with the upper end winding edge of the can is formed at one end, a rear end engaging part that engages with the lower end winding edge of the can is formed at the other end, and the middle part is bent to form the can body. A can opening tool main body is provided with a fulcrum part that comes into contact with the can opening tool body, and a gas ejection hole communicating with the inner and outer surfaces is bored between the tip engaging part and the fulcrum part of the can opening tool main body. A timer membrane is provided to block the gas ejection hole, while a claw member protruding in a right angle direction and a packing plate that can be brought into close contact with the surface of the can body are provided, and a communication hole is formed in the packing plate at a position corresponding to the gas ejection hole. By engaging the tip engaging portion with the upper end winding edge of the can and pressing the rear of the can opening tool body toward the can body, the pawl member perforates the can body, and then the fulcrum A timed opening device for a high-pressure gas can, characterized in that the main body of the can opening device is fixed to the can by bending the rear end of the can and engaging the rear end engaging portion with the lower end winding edge of the can. can utensils.