JPH0555800B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bullet firing device for a gas gun that can fire a large number of bullets in rapid succession using compressed gas, such as air.

(Prior Art) Conventionally, gas guns that can fire bullets continuously while the trigger is pulled are known as Utility Model Publication No. 37-10895 and Japanese Patent Publication No. 62-27358.

The former type of gas gun has a bullet insertion port at the top, a piston cylinder, a piston, a valve, and return springs for each member inside, and air is introduced from behind the piston. Further, in the standby state, the forward movement of the piston barrel and piston is regulated by a latch that is interlocked with a trigger.

Therefore, when the trigger is pulled, the latch is released and the piston barrel moves forward to close the bullet insertion port, and then the valve is opened by the advance of the piston, and the introduced air causes the bullet in the barrel to be fired. Since the air is released at the same time as the bullet is fired, the piston barrel and piston return due to the action of the spring, and the next bullet is supplied from the bullet insertion port, and the rear valve is closed. Closing the valve increases the air pressure, and the piston barrel and piston move forward again to fire the next bullet, and the above-mentioned operation is repeated as long as the trigger is pulled.

On the other hand, the latter gas gun has a movable inner cylinder, an O-ring, and a spring for returning the inner cylinder in the gun barrel, and also has a stepped part on the inside of the barrel, and the air passage connected to the rear can be opened and closed by a trigger. I'm starting to be able to do it. Therefore, when the trigger is pulled, air is introduced from the rear and the forwardmost bullet, O-ring, and inner cylinder move forward, and when the O-ring reaches the step position, it expands and the bullet is fired. Also, since the air escapes at the same time as the bullet is fired, the inner cylinder and O-ring return due to the action of the return spring, and as the next bullet is fitted into the O-ring, the air pressure rises again and the above-mentioned operation is repeated.

(Problem to be solved by the invention) However, the gas gun of Utility Model Publication No. 37-10895 has the drawback that the piston inside the barrel constantly moves back and forth while firing a bullet, which causes the barrel to shake and reduce the accuracy. For this reason, the lower part of the gun barrel must be supported by a pedestal. In addition, it requires a large number of interlocking mechanisms, moving parts, and various springs for firing bullets.
The structure has become extremely complex.

On the other hand, the gas gun of Special Publication No. 62-27358 is structurally quite simple, but because the inner cylinder and O-ring inside the gun barrel constantly move back and forth, the problem of accuracy still remains as mentioned above. has been done. Furthermore, in order to smoothly slide the O-ring along the inner surface of the gun barrel or the engine section, it is necessary to constantly or periodically replenish lubricating oil, and wear of the O-ring cannot be avoided.

The present invention has been made in view of the above circumstances, and its purpose is to provide a bullet firing device for a gas gun that can improve the accuracy of bullets by eliminating moving parts on the barrel side, and does not require replenishment of lubricating oil. It is about providing.

(Means for Solving the Problems) In order to achieve the above object, the bullet firing device for a gas gun according to the present invention includes a bullet supplying means for sequentially feeding bullets into the chamber of the gas gun, and a bullet feeding means for feeding bullets into the chamber of the gas gun, an O-ring that temporarily stops the bullet; a cylinder that is connected to the rear of the chamber and communicates with the chamber; a gas supply means that is connected to the cylinder and supplies gas at a predetermined pressure into the cylinder; A valve that opens and closes the gas passage of the gas supply means, and a piston that is reciprocatably provided in the cylinder and advances toward the chamber due to the pressure difference in the cylinder to push out the bullet in the chamber against the blocking force of the O-ring. , a communication passage that passes through the piston in the axial direction and allows gas on the rear side of the piston to pass to the chamber side, and a return spring that returns the advanced piston to its original position.

(Function) With these configurations, when a bullet supply means such as a magazine is first attached to the chamber, the leading bullet stops in contact with the O-ring.

When the trigger is pulled here, the gas passage is opened and gas is introduced into the rear cylinder, and this gas enters the chamber through the air passage of the piston.
The leading bullet is pressed against the O-ring. Also,
Since the pressure in the cylinder, air passage, and chamber are uniform, the large-area piston at the rear moves forward due to the differential pressure, pushing out the bullet in the chamber against the blocking force of the O-ring and causing it to fire.

At the same time as the bullet is fired, the high pressure gas in the cylinder is released through the air passage of the piston and the gun barrel, so the piston moves back under the action of the return spring and returns to its original position. As a result, the next bullet is fed into the chamber from the bullet supply means and comes into contact with the O-ring, and the above-mentioned operation is then repeated as long as the trigger is pulled.

(Example) FIG. 1 is a longitudinal cross-sectional view of a gas gun 1 incorporating the bullet firing device of the present invention, and FIG. 2 is an enlarged cross-sectional view of the firing mechanism portion.

In this gas gun 1, a chamber 3 is connected to the rear of an elongated gun barrel 2, and a magazine 5 as a magazine is attached to a joint 4 projecting below the chamber 3. The magazine 5 has an elongated magazine tube 6 inside, and the magazine tube 6 is filled with a large number of bullets 7. Each bullet 7 is urged upward toward the outlet side by a coil spring 8 in the lower end of the tube, and is prevented from ejecting by a magazine seal 9 before the magazine is attached.
When connected to the magazine seal 9 opens and the bullet 7
is supplied into the chamber 3.

As can be seen from FIG. 2, an O-ring 10 is fixed to the boundary between the barrel 2 and the chamber 3.
Ring 10 has an inner diameter slightly smaller than bullet 7.

A cylinder 11 is connected to the rear end of the chamber 3, and a piston 12 is installed inside the cylinder 11 so as to be able to reciprocate. The piston 12 is arranged so that its elongated front end 12a can enter a hole in the chamber 3 and push out the leading bullet 7, and is normally biased rearward by a return spring 13. Furthermore, the spaces between the piston 12 and the cylinder 11 and between the elongated tip 12a and the rear end of the chamber are sealed with O-rings 14 and 15, respectively. Furthermore, an air passage 16 is formed in the piston 12 and passes through the piston 12 in the axial direction.

A plurality of air vent holes 1 are provided on the side surface of the cylinder 11.
7 is provided, and a joint 18 is connected to the lower rear end. An air tube 19 through which air flows is connected to the joint 18, and the air tube 19 passes through the handle 21 of the gas gun via a valve 20 and is connected to an external compressor (not shown).

The valve 20 opens and closes an air passage, and is provided with a valve seat 21, a valve body 22, and a coil spring 23 inside. Normally, the valve body 22 is pressed against the valve seat 21 by the pressing force of the coil spring 23, and the air is released. It's blocking the passage. A tip 22a of the valve body 22 protrudes outward, and the rear end of the trigger 24 abuts this protruding end. The trigger 24 is rotatable about a support shaft 25 and is restricted to the position shown in FIG. 1 by a stopper 26. When the trigger 24 is pulled, the valve body 22 is pushed and the air passage is opened.

The bullet firing device of this embodiment configured as described above operates in the following order.

First, the bullet 7 in the magazine 5 is held by the coil spring 8
The bullet 7 at the tip inside the chamber 3 comes into pressure contact with the O-ring 10 and is prevented from ejecting. In addition, the high pressure air from the compressor is
is closed, so the upstream of valve 20 (handle 21
inside).

When the trigger 24 is pulled at this point, the valve body 22 is pushed and separated from the valve seat 21, so that air flows into the air tube 1.
9 and into the cylinder 11 through the joint 18,
Since this gas enters the chamber 3 through the air passage 16 of the piston 12, the leading bullet 7 is pressed against the O-ring 10. Furthermore, since the pressure inside the cylinder 11, air passage 16, and chamber 3 is uniform, the piston 12, which has a large rear area, moves forward due to the differential pressure (Fig. 3), and the leading bullet 7 and the next bullet 7
3 and 4, the tip 12a of the piston 12 pushes out the leading bullet 7 against the blocking force of the O-ring 10, so that the bullet 7 is fired. When the piston 12 moves forward, the air in the left side space of the cylinder 11 is released through the air bleed hole 17.
The piston 12 can move quickly and will not be braked.

Next, when the bullet 7 is fired, the high-pressure air in the cylinder 11 also flows out from the air passage 16 of the piston 12 and the gun barrel 2, so the air pressure temporarily decreases, and the piston 12 moves as shown in FIG. It moves backward by the force of the return spring. As the next bullet 7 which was being held down is now released, it rises and comes into contact with the O-ring 10, returning to the state shown in FIG. 2.

The operations shown in FIGS. 2 to 5 are repeated in a short period of time while the trigger 24 is being pulled, thereby causing the bullets 7 to be fired continuously. When the finger is released from the trigger 24, the valve body 22 is pressed against the valve seat by the biasing force of the coil spring 23, and the air passage is cut off, so that firing of the bullet is stopped.

Incidentally, the magazine 5 for supplying bullets, the valve 20 for opening and closing air, and the trigger 24 shown in the above embodiment are as follows:
It is also possible to employ other mechanisms, and the piston 12 may be actuated by gas other than air.

Furthermore, if the magazine tube 6 is used not only for bullet feeding but also as an air supply passage, the bullet 7 can be moved by air, and the air enters the cylinder through the air passage of the piston, and the piston is moved by differential pressure as in the above embodiment. moves forward, so the coil spring 8 and air tube 19 for feeding the bullet can be omitted.

(Effects of the Invention) As detailed above, in the bullet firing device for a gas gun according to the present invention, since there is no movable part on the gun barrel side, the accuracy of the bullet can be improved without supporting the gun barrel with a pedestal or the like. I can do it. Furthermore, since the O-ring that temporarily stops the bullet is fixed within the chamber, there is no need to constantly replenish lubricant as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a gas gun incorporating the bullet firing device of the present invention, and FIGS. 2 to 5 are enlarged sectional views showing the bullet firing operation. 1... Gas gun, 2... Gun barrel, 3... Chamba,
5... Magazine, 7... Bullet, 10... O-ring, 11... Cylinder, 12... Piston, 13
...Return spring, 16...Air passage, 19...Air tube, 20...Valve, 24...Trigger.

Claims (1)

[Scope of Claims] 1. A bullet supply means that sequentially feeds bullets into the chamber of a gas gun, an O-ring that is fixed in the chamber and temporarily stops the leading bullet, and a cylinder that is connected to the rear of the chamber and communicates with the chamber. a gas supply means that is connected to the cylinder and supplies gas at a predetermined pressure into the cylinder; a valve that opens and closes a gas passage of the gas supply means in conjunction with the trigger of the gas gun; A piston that advances toward the chamber due to the differential pressure within the cylinder and pushes out the bullet in the chamber against the blocking force of the O-ring, and a communication passage that penetrates the piston in the axial direction and passes gas from the rear side of the piston to the chamber side. A bullet firing device for a gas gun, characterized in that it is equipped with a return spring that returns the advanced piston to its original position.