JPH0561560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gas gun that can continuously fire bullets made of synthetic resin or the like using gas pressure.

(Prior Art) In general, when a gas gun fires a bullet, gas pressure is applied to the bullet installed at the end of the barrel in a direction from the cylinder to the gun barrel to cause the bullet to be fired.

By the way, in many conventional gas guns, gas pressure builds up inside the magazine. Therefore, it was necessary to make the magazine airtight.

However, as a result of making the magazine airtight, the structure becomes complicated, making it difficult to assemble the magazine and increasing manufacturing costs. Furthermore, feeding bullets into such a complicated magazine was time-consuming.

On the other hand, as a firing device that does not require an airtight magazine, Japanese Patent Application Laid-Open No. 62-288499 discloses that after loading a bullet into the bullet inlet of the barrel, a piston member is pressed from one end of the barrel with pressurized gas. However, a technique has been disclosed in which pressurized gas is introduced into the gun barrel by sealing the bullet inlet while pushing the bullet into the gun barrel, and then opening a needle valve provided at the rear of the piston member. , it is necessary to increase the length of the mechanism that opens and closes the needle valve, and because the structure of the mechanism is complicated, there is a lot of pressure loss in the pressure gas, and improvements are needed in terms of obtaining a practical initial velocity of the bullet. It was hot.

(Problems to be Solved by the Invention) As described above, in conventional gas guns, in order to eliminate the airtightness of the magazine mounted near the gun barrel, it is necessary to provide a complicated valve opening/closing mechanism within the gun body. When this was provided, there was a problem that the pressure loss of the pressurized gas was large and the initial velocity of the bullet could not be obtained.

The present invention was made in view of these problems, and its purpose is to reduce the number of parts by simply configuring the valve opening/closing mechanism within the gun body, thereby reducing the pressure gas flow. To provide a gas gun capable of increasing the initial velocity of a bullet by widening the passage and reducing pressure loss.

(Means for Solving the Problems) To achieve the above object, the present invention provides a cylinder fixed to a gun body along the firing direction, having an opening at the front and a pressure gas inlet at the rear; a hollow piston that is installed movably in front of the pressure gas inlet of the cylinder, has a hollow rod at its tip that is exposed from the opening of the cylinder, and has a flange that makes airtight sliding contact with the inner surface of the cylinder at its rear end; a fixed rod fixed to the rear inner surface of the cylinder and arranged facing the firing direction; and a fixed rod arranged around the fixed rod in front of the pressure gas inlet in the cylinder, the front surface of which is attached to the back surface of the flange of the hollow piston. A sliding valve is inserted between the front surface of the flange of the hollow piston and the inner surface of the front part of the cylinder, and the rear surface of the flange of the hollow piston is attached by the pressure gas when pressure gas is introduced into the cylinder. a first spring that is brought into pressure contact with the front surface of the biased sliding valve; and a first spring that is fixed to the tip of the fixed rod and is biased by the pressure gas when introducing pressure gas into the cylinder and becomes integral with the hollow piston. a stopper that prevents only the sliding valve from moving forward and separates the hollow piston and the sliding valve; and a stopper that separates the hollow piston from the sliding valve; and a stopper that separates the sliding valve from the sliding valve; and a stopper that separates the sliding valve from the sliding valve; a second spring inserted therein for retracting the sliding valve when the sliding valve is separated from the hollow piston by the stopper; A gun barrel whose end has an inner diameter into which the hollow rod of the hollow piston can be inserted; and a magazine fixed near the rear end of the barrel and having a bullet discharge port for discharging bullets between the rear end of the barrel and the cylinder. It is characterized by comprising:

(Function) In the present invention, in the initial state, the hollow piston is retracted by the first spring, and the back surface of the flange of the hollow piston is in contact with the sliding valve. On the other hand, the bullets in the magazine are ejected from the bullet outlet between the rear end of the gun barrel and the cylinder.

Here, when pressure gas is introduced into the rear end surface of the hollow piston and the sliding valve from the pressure gas inlet of the cylinder, the sliding valve and the hollow piston move forward as one, and the hollow rod at the tip of the hollow piston moves forward. It is inserted into the barrel of the gun, forcing the bullet into the barrel and sealing the interior of the hollow piston. At this time, only the sliding valve is prevented from moving forward by a stopper fixed to the tip of the fixed rod, but since the hollow piston moves forward due to inertia, the sliding valve and the hollow piston are separated. Then, the pressure gas in the cylinder flows into the separated gap, and at the same time, the slide valve is moved back by the second spring.

Then, the pressurized gas flows into the hollow part of the hollow piston and fires the bullet in the barrel to the outside through the hollow part of the hollow rod. At this time, since the hollow rod is inserted into the gun barrel, pressure gas will not leak from between the gun barrel and the cylinder.

Note that since the seal in the cylinder is released by firing the bullet, the gas pressure in the cylinder drops rapidly, and the hollow piston is retracted by the first spring to return to the initial state.

On the other hand, the bullets in the magazine are ejected between the barrel and cylinder as the hollow rod retreats. onwards,
The operations described above can be repeated in a similar manner.

That is, since the hollow piston and the sliding valve are brought into pressure contact using the biasing force of the pressure gas, the gas sealing mechanism can be configured extremely easily, and the number of parts used for this purpose can be reduced.

Furthermore, by reducing the number of parts used, the gas passage within the cylinder can be expanded, reducing the pressure loss of the pressurized gas and increasing the initial velocity of the bullet.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a sectional view of a gas gun according to an embodiment of the present invention.

A cylinder 1 is fixedly provided to the main body of the gas gun. A fixed rod 3 is fixed within the cylinder 1. A stopper 5 is provided at the end of the fixed rod 3, and a valve 7 is slidably provided on the fixed rod 3 via an O-ring 6. The presence of the O-ring 6 allows the valve 7 to slide against the fixed rod 3 in an airtight manner. The valve 7 abuts the stopper 5 in its most advanced position (FIG. 2b) and is retracted by a second spring 9 provided between the stopper 5 and the valve 7.

On the other hand, the bullet 13 in the magazine 11 is sent out to the end of the gun barrel 17 by a spring 16 having a pressing piece at its tip.

The hollow piston 19 has a convex portion 21 at one end serving as a flange that slides into airtight contact with the inner surface of the cylinder 1 via an O-ring 20, and further includes:
The end surface of the convex portion 21 is connected to the O-ring 22 with respect to the valve 7.
The end face of the convex portion 21 is isolated from the valve 7 at the most advanced position (FIG. 2c). The other end of the hollow piston 19 is provided with a hollow rod 23 for pushing the bullet 13 through a rubber ring 18 provided at the end of the barrel 17. Further, this hollow piston 19 is retracted by a first spring 25 provided between the front inner surface 1a of the cylinder 1 and the front end surface 19a of the convex portion 21.

Gas pressure is applied to the rear end surfaces of the valve 7 and the hollow piston 19 by high pressure gas sent into the cylinder 1 from a gas inlet pipe 27 provided at the rear of the cylinder 1 .

The upper end of the gas inflow pipe 27 is fitted into the rear part of the cylinder 1, and the lower end is provided with a minute slit 29, to which a spherical valve 31 is crimped by a spring 33. A moving cylinder 35 is provided to be slidable on the outer surface of the gas inflow pipe 27 . A gas supply pipe 37 is provided on the side of the moving cylinder 35.
is provided, and the lower part is connected to the connecting rod 39, and when the trigger 41 is pulled, one end of the trigger 41 is connected to the shaft 4.
3 as a fulcrum and rotates in the A direction, the trigger 41
The moving cylinder 35 moves in the B direction together with the connecting rod 39 rotatably connected to the other end via a pin 45. An O-ring 47 is provided on the inner surface of the moving cylinder 35. Before the moving cylinder 35 rises (that is, when the trigger 41 is not pulled)
is a minute slit 2 provided in the gas inflow pipe 27.
9 is sealed by the O-ring 47, so that gas does not flow into the gas introduction pipe 27 from the gas supply pipe 37. When the trigger 41 is pulled and the movable cylinder 35 moves in direction B, gas flows from the gas supply pipe 37 into the gas inflow pipe 27 through the minute slit 29 of the gas inflow pipe 27 and enters the cylinder 1 .

Next, the operation of this gas gun will be explained based on FIG. FIG. 2 is a diagram showing the operating process of the firing mechanism section of this gas gun divided into four stages a to d.

When the trigger 41 is not pulled (Fig. 2a),
The valve 7 and the hollow piston 19 are connected to springs 9 and 25, respectively.
On the other hand, the bullet 13 in the magazine 11 and the pressing piece 15 are sent out to the end of the barrel 17.

Here, when the trigger 41 is pulled, the gas inflow pipe 27
High-pressure gas flows into the cylinder from the cylinder, gas pressure is applied to the rear end surfaces of the valve 7 and the hollow piston 19, and the valve 7 and the hollow piston 19 move forward at the same time. Eventually, the valve 7 comes into contact with the stopper 5 and stops (FIG. 2b). On the other hand, the hollow rod 23 and the hollow piston 19
The bullet 13 moves forward with the hollow rod 2.
3 into a rubber ring 18 provided at the end of the barrel 17. At this time, the outer surface of the advanced hollow rod 23 presses the bullet 14 in the bullet outlet 12 of the magazine 11.

Even after the valve 7 contacts the stopper 5, the hollow piston 19 continues to move forward due to inertia, and the front end 19b of the hollow piston 19 contacts the front inner surface 1a of the cylinder 1 and stops (FIG. 2c). Therefore, the end face of the convex part 21 is isolated from the valve 7, and the high pressure gas in the cylinder 1 flows into the hollow part of the hollow piston 19 through this gap, and the high pressure gas that flows in also passes through the hollow part of the hollow rod 23. Squirt outside. Therefore, the bullet 13 at the front end of the hollow rod 23 is pushed by the ejected gas and is ejected from the gun barrel 17 to the outside. Incidentally, at this time, the bullet 14 in the bullet outlet 12 of the magazine 11 is already held down by the outer surface of the hollow rod 23, so the gas ejected from the hollow rod does not flow into the magazine 11 and flows into the gun barrel. It will flow out to the outside via 17.

After the bullet 13 is fired from the barrel 17, the inside of the cylinder 1 is released to the outside, and the gas pressure inside the cylinder 1 drops rapidly, so that the springs 9 and 25 respectively close the valve 7. and hollow piston 1
9 is moved back (Fig. 2 d shows the middle),
Returning to the state shown in FIG. 2a, on the other hand, the bullet 14 in the magazine 11 is delivered to the end of the barrel 17 by the pressing piece 15, and thereafter the above-described operation is repeated in the same manner.

Thus, according to this embodiment, the gas pressure is
There is no need to make the magazine 11 airtight, and as a result, the structure of the magazine 11 is simplified, making it easy to assemble the magazine 11 and reducing manufacturing costs. Feeding bullets to the magazine 11 becomes easier.

FIG. 3 shows a second embodiment of the present invention. As shown in the figure, in the second embodiment, the valve 7 of the first embodiment is in contact with the stopper 7 (second Convex portion 2 of hollow piston 19 in figure b)
the stopper 4 so as to come into contact with the front end surface 19a of the
9 is provided to penetrate the side surface of the cylinder 1 from the outside. This stopper 49 is connected to a trigger 41 (not shown), and when the trigger 41 is pulled, it is pulled toward the outside of the cylinder 1, and the front end surface 19a is connected to the stopper 41.
to be freed from

On the other hand, the moving cylinder 35, the spherical valve 31, etc. are omitted, the gas supply pipe 37 is directly connected to the gas inflow pipe 27, and the gas supplied from the gas supply pipe 37 is directly supplied to the gas inflow pipe 27.

With the configuration as described above, when the trigger 41 is pulled, the stopper 49 is pulled outward from the side surface of the cylinder 1, and the hollow piston 19 advances to the state shown in FIG. 2c. Repeat the same action.

However, according to the second embodiment, the moving cylinder 35 and the spherical valve 31 required in the first embodiment are
etc. parts are no longer required.

Further, in the first embodiment and the second embodiment, the spring 9 serving as the first pressing means is provided between the stopper 5 and the valve 7, but the invention is not limited to this, and for example, as shown in FIG. , a similar effect can be obtained by providing the valve between the hollow piston 19 and the valve 7.

Furthermore, in the embodiment described above, the fixed rod 3 of the valve 7
Although the O-ring 6 is interposed to allow the valve to slide airtightly against the valve 7, as shown in FIG. Even without interposing the ring 6, the valve 7 can be slid against the fixed rod 3 in an airtight manner. In this case, by providing the cover 51, the high-pressure gas sent from the gas supply pipe 27 can also enter the hollow portion of the cover 51, so that the effective volume of the cylinder 1 can be increased.

(Effects of the Invention) As explained above, according to the present invention, the gas sealing mechanism Also, the unsealing mechanism can be configured easily, and as a result, the number of parts can be reduced.

In addition, by configuring the above-mentioned mechanism simply, the length of the bullet firing engine section as a whole can be shortened, and the pressure gas passage inside the cylinder can be widened.
The pressure loss of the pressurized gas is reduced, and as a result, the initial velocity of the bullet can be increased.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of this embodiment, FIG. 2 is a diagram showing the operating process of the firing mechanism of this gas gun divided into four stages a to d, and FIGS. 4 and 5 are diagrams showing the firing mechanism section of other embodiments. 1... Cylinder, 3... Fixed rod, 5... Stopper, 7... Valve, 9... Spring, 11... Magazine, 15
... Pressing piece, 16 ... Spring, 17 ... Barrel, 19
...Hollow piston, 21 ... Convex portion, 23 ... Hollow rod, 25 ... Spring, 27 ... Gas inflow pipe, 3
7...Gas supply pipe, 41...Trigger.

Claims (1)

[Scope of Claims] 1. A cylinder fixed to a gun body along the firing direction, having an opening at the front and a pressure gas introduction port at the rear, and a cylinder capable of advancing and retreating in front of the pressure gas introduction port of the cylinder. a hollow piston having a hollow rod at its tip that is exposed through the opening of the cylinder and a flange at its rear end that makes airtight sliding contact with the inner surface of the cylinder; a fixed rod disposed; a sliding valve disposed around the fixed rod in front of the pressure gas inlet in the cylinder so that its front surface can come into contact with the back surface of the flange of the hollow piston;
The hollow piston is inserted between the front surface of the flange of the piston and the inner surface of the front portion of the cylinder, and when pressure gas is introduced into the cylinder, the rear surface of the flange of the hollow piston is pressed against the front surface of the sliding valve that is energized by the pressure gas. and a first spring fixed to the tip of the fixed rod to prevent only the sliding valve from moving forward together with the hollow piston when pressurized gas is introduced into the cylinder. a stopper that separates the hollow piston and the sliding valve; and a stopper that is inserted between the front surface of the sliding valve and the back surface of the stopper of the fixed rod or the inner surface of the front part of the hollow piston, so that the sliding valve is separated by the stopper. a second spring that retracts the sliding valve when separated from the hollow piston; and a spring that is fixed to the gun body on the same axis in front of the hollow rod of the hollow piston and that has at least its rear end inserted into the hollow rod of the hollow piston. 1. A gas gun comprising: a gun barrel having a maximum inner diameter; and a magazine having a bullet ejection port fixed near the rear end of the barrel and discharging bullets between the rear end of the barrel and the cylinder. 2. The gas gun according to claim 1, further comprising a second stopper that extends through the cylinder and operates in conjunction with a trigger and engages with the convex portion of the hollow piston. 3. The gas gun according to claim 1 or 2, wherein the valve is provided with a cover that covers the fixed rod.