JP2020204449A - Decompression shooting device - Google Patents

Abstract

To provide a simple decompression shooting device which does not utilize a vacuum pump, etc., that is expensive, shoots a shooting body 8 by producing a decompression state using an easy-to-obtain pipe and commercially available components, and can be easily and manually operated within a remarkably short time.SOLUTION: A simple structure is employed in which a neodymium magnet that is a coupling device 4 (1) and a transparent thin check valve 7 that can be opened and closed by pneumatic pressure are attached to the tip of a cylinder 1, and a shooting body 8 and a neodymium magnet 4 (2) that is a coupling device 4 (2) are attached to the tip of a piston 2. When the piston 2 is pulled toward an opposite side to a side from which the shooting body is shot as fast as possible, at the instant at which the piston 2 goes out the cylinder 1, the shooting body 8 is disengaged from the tip of the piston 2. The shooting body 8 is carried toward the tip by external pneumatic pressure from the rear end portion of the cylinder 1, the thin check valve 7 at the tip is opened, and thus the shooting body 8 is shot at fast speed together with keen shooting sounds.SELECTED DRAWING: Figure 2

Description

The present invention relates to a decompression launcher used in an experiment in which the effect of depressurizing air is easily and effectively demonstrated at a science show in a science museum or the like or an educational institution.

Until now, there has been something like an air gun that uses the pressure of air to shoot air itself, or pushes a paper ball or sponge ball with a piston to fire it (see Patent Document 1).

Generally, a sphere existing in a decompressed state cannot fire a sphere against the outside air pressure like an air gun.

There is no decompression launcher used in scientific experiments that decompresses the inside of a cylinder in a short time at a low cost and uses the pressure difference from the external atmospheric pressure to launch a projectile.

Japanese Unexamined Patent Publication No. 11-352877

Means to solve problems

This device is a decompression launcher that launches the projectile 8 by creating a decompression state using a nearby pipe or commercially available parts without using an expensive vacuum pump or the like. It can be operated manually in an extremely short time and easily. As shown in FIGS. 1 to 4, at the tip of the cylinder 1, a check valve that can be opened and closed by air pressure connected by a connecting device 4 (1) fixed to the opening 3 with an adhesive tape 12 and a connecting device 5 (1). 7 has a simple structure in which a connecting device 4 (2) fixed with a double-sided tape 11 and a projectile 8 having a connecting device 5 (2) are connected to the tip of the piston 2. The piston 2 has a stopper 9 so that the loaded projectile 8 does not touch the check valve 7. By pulling the non-slip 10 of the piston 2 toward you as quickly as possible, the projectile 8 comes off the tip of the piston 2 at the moment the piston 2 comes out of the cylinder 1, and the external air pressure from the rear end of the cylinder 1 The projectile 8 is carried to the tip, the check valve 7 at the tip is opened, and the projectile 8 is launched at high speed.
(1) In order to maintain a high degree of decompression inside the cylinder 1 and to further improve the movement of the piston 2, a sealing agent 13 having good lubricity is used between the cylinder 1 and the piston 2.
(2) For the check valve 7, a light transparent plastic plate with a thickness of 0.3 mm is used for the purpose of shutting off the atmospheric pressure, generating a loud firing sound, and confirming the loading of the projectile 8. To do. For the hinge 6, a plastic tape having an appropriate hardness that opens and closes quickly by air pressure entering from the rear end of the cylinder 1 is used. In order to improve the adhesion between the check valve 7 and the cylinder 1, the sealant 13 is attached. Further, the check valve 7 is attached with the connecting device 4 (1) and the connecting device 5 (1) so that the check valve 7 is closed except when the projectile 8 passes through. As a result, the check valve 7 is closed when the piston 2 is pulled, and the inside of the cylinder 1 is maintained in a depressurized state regardless of which direction the device is directed up, down, left or right.
(3) At the moment when the piston 2 is pulled out from the cylinder 1, the projectile 8 is connected to the piston 2 by the connecting device 4 (2) and the connecting device 5 (2), and is therefore located at the rear end of the cylinder 1. .. The projectile 8 is sufficiently prevented from being detached from the piston 1 by the coupling device 4 (2) and the coupling device 5 (2) when the piston 2 is pulled to the rear portion.
(4) When air enters the cylinder 1 from the rear end by the force of atmospheric pressure, the projectile 8 is in the optimum position from the connecting device 4 (2) and the connecting device 5 (2) at the tip of the piston 2. The coupling device 4 (2) and the coupling device 5 (2) are adjusted so that the force acting between the coupling device 4 (2) and the coupling device 5 (2) and the projectile 8 becomes the optimum strength so as to be disengaged. ..
Although not marked with reference to FIGS. 1 to 4, the connecting device 4 is a superordinate concept in which the connecting device 4 (1) and the connecting device 4 (2) are integrated, and the connecting device 5 is the connecting device 5 (1). It is a superordinate concept that integrates the coupling device 5 (2) and the coupling device 5 (2).

Effect of the invention

In scientific experiments, the projectile 8 was fired forward despite the decompression inside the cylinder 1 and the action of pulling the piston 2 backwards, as opposed to a normal air gun. There is a surprise and surprise of the experiment.

This device is a decompression launcher that launches the projectile 8 by creating a decompression state using commercially available parts at hand without using an expensive vacuum pump or the like. It can be operated manually in an extremely short time and easily.

When the piston 2 is pulled backward as quickly as possible, the projectile 8 is disengaged from the piston 2 at the moment when the piston 2 is disengaged from the cylinder 1, and the projectile 8 is transported to the tip of the cylinder 1 by the acceleration effect due to the external air pressure. The check valve 7 at the tip of the cylinder 1 is quickly opened by the action of the hinge 6, the connecting device 4 (1) and the connecting device 5 (1), and the projectile 8 is launched at high speed. For these operations, by keeping the connecting force at the optimum strength, the connecting force is cut off without hindering the progress of the projectile 8. During that time, a series of operations are performed in a short time of 0.01 seconds or less. Since the air resistance in the cylinder 1 is extremely low, the initial speed of passing through the tip reaches 30 m / s or more. In an experiment using the present invention, it is possible to experience the tremendous pressure difference between atmospheric pressure and vacuum.

It is a front view of the decompression launching apparatus which concerns on this invention. FIG. 1A is a cross-sectional view of the right side surface of the decompression launcher according to the present invention. It is an enlarged view of the cross section of the right side surface which shows the detail of the tip part of a cylinder 1. It is an enlarged view of the cross section of the right side surface which shows the details of a piston 1 and a projectile 8.

By holding the cylinder 1 of the present device shown in FIGS. 1 to 4 by hand and quickly pulling the non-slip 10 of the piston 2 with the other hand, the connecting device 4 (1) and the connecting device at the tip of the cylinder 1 The lightweight check valve 7 connected by 5 (1) is pneumatically opened and closed, and the pneumatically accelerated projectile 8 is launched at high speed.
In order to operate the series of operations of the projectile 8 leaving, accelerating, opening the check valve 7, passing through the check valve 7, and closing the check valve 7 without delay, the connecting device 4 (2) and the connecting device 8 are connected. By keeping the connecting force of the device 5 (2) at the optimum strength, the connecting force is adjusted so as to block the firing of the projectile 8 without being hindered.

(1) Bird and beast repellent can be repelled by both the sound and the flying projectile.
The operation method is simple, and any number of shots can be fired in an extremely short time.
It can be used only by sound, and the operating cost is low.
Sometimes it is only sound, and sometimes the projectile flies, which makes it difficult for birds and beasts to predict, which can be effectively repelled.
(2) Since no simple cracker gunpowder is used, there is no odor and the firing sound is loud enough.
Various projectiles can be launched depending on the device.

1 cylinder (paper, plastic, metal, etc.)
2 Piston (plastic, wood, metal, etc.)
3 Openings (plastic, wood, metal, etc.)
4 Connecting device (ferromagnet, electromagnetic coil, spring, etc.)
4 (1) Connecting device (ferromagnet, electromagnetic coil, spring, etc.)
4 (2) Connecting device (ferromagnet, electromagnetic coil, spring, etc.)
5 Connecting device (lightweight wire, hook, etc.)
5 (1) Connecting device (lightweight wire, hook, etc.)
5 (2) Connecting device (lightweight wire, hook, etc.)
6 Hinge (plastic, metal, etc.)
7 Check valve (plastic, metal, etc.)
8 Projectors (Styrofoam, rubber, plastic, etc.)
9 Stopper 10 Non-slip (vinyl tape, rubber, etc.)
11 Double-sided tape 12 Adhesive tape 13 Sealant (cellophane tape, vinyl tape, aluminum laminated tape, rubber ring, silicone grease, etc.)

Claims (2)

A check valve 7 composed of a cylinder 1 having an opening 3, a piston 2 to be inserted into the cylinder 1, and a projectile 8 to be loaded inside the cylinder 1 and closing the opening 3 at the tip of the cylinder 1. A decompression launcher characterized by being provided. The cylinder 1 has a hinge 6, a connecting device 4 (1) and a connecting device 5 (1), and the check valve 7 is connected to the opening 3 by the hinge 6, the connecting device 4 (1) and the connecting device 5 (1). Being done
The piston 2 has a coupling device 4 (2), the projectile 8 has a coupling device 5 (2), and the projectile 8 has a coupling device 4 (2) of the piston 2 and a coupling device 5 (2) of the projectile 8. The decompression launching device according to claim 1, wherein the decompression launching device is connected by

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