JP2014059108A - Gas gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas gun capable of preventing wasteful gas consumption, and efficiently using a compressed gas by preventing leakage of the compressed gas used as a power source of the gas gun from between a shaft portion and a shaft hole of a discharge valve.SOLUTION: An O-ring 23 closely attached to an outer periphery of a shaft portion 15 of a discharge valve 10, is fitted to a rear end in a valve chest 19 of a valve case 8, and a return spring 20 accommodated in the valve chest 19 through a washer for locking the O-ring 23, is retained by a valve seat 17 fixed to a front portion of the valve chest 19 of the valve case 8 in a close contact state, thus the O-ring 23 in the valve chest 19 is kept in a state of being closely kept into contact with a rear end in the valve chest 19 by biasing of the return spring 20, even when a rear end of a discharge valve 10 is struck by a hammer 13 and the discharge valve 10 moves forward, the washer is pressed by the compressed gas flowing into the valve chest 19 from an opening 18 in the valve seat 17, and the whole periphery of the O-ring 23 is uniformly deformed, thus strong sealing performance can be exerted.

Description

  The present invention relates to a gas gun including a discharge valve configured to open and close a gas passage of compressed gas used as a power source.

  Conventionally, a gas gun using compressed gas is known as a power source of a toy gun. In this gas gun, a gas passage is opened by hitting a rear end of a discharge valve with a hammer or the like, and a bullet is fired by spraying the released compressed gas onto a bullet waiting in a chamber.

  By the way, it has been known that substitute chlorofluorocarbons, which have been used as a power source for gas guns, have a greenhouse effect several hundred to 10,000 times that of carbon dioxide (CO2). Therefore, in recent years, the reduction of alternative CFC emissions has been promoted. Accordingly, in response to such a situation, a gas gun using a CO2 cylinder filled with liquefied carbon dioxide gas has been developed in the field of toy guns.

  Here, a conventional technique using carbon dioxide gas or the like as a power source will be described with reference to Patent Document 1. The toy air gun described in Patent Document 1 has a magazine built in a grip portion, and a gas accumulation chamber of the magazine is filled with a compressed gas such as chlorofluorocarbon, nitrogen gas, and carbon dioxide, and the chamber is filled with the compressed gas. It is designed to fire bullets.

  As shown in FIG. 5, such a toy air gun is provided with a discharge valve 51 in a gas passage 50 extending from the gas accumulator chamber to the chamber, and a valve body 53 is inserted into a shaft hole 52 a of the valve sleeve 52, thereby The opening 56 of the valve seat 55 is opened and closed by a valve portion 54 provided at the tip of the valve seat 55. Further, the discharge valve 51 has a gas discharge port 57 communicating with the opening 56 of the valve seat 55, and this gas discharge port 57 communicates with the gas passage 50 above it.

  In such a structure, an O-ring packing 60 fitted to the outer periphery of the valve body 53 is accommodated in a recess 59 formed around the shaft hole 52a of the valve sleeve 52. I support it. Further, a washer 62 is fixed to the rear end of the valve body 53, and the valve body 53 is returned backward by the elastic force of a return spring 63 provided between the washers 61, 62.

Utility Model Registration No.3051479

  Incidentally, as described above, in order for the valve body 53 to move through the shaft hole 52a of the valve sleeve 52, a minute clearance is required between the valve body 53 and the shaft hole 52a. There was a problem of causing the inside compressed gas to leak outward.

  In order to solve such a problem, conventionally, as shown in FIG. 5, a gas leak is prevented by fitting an O-ring packing 60 into a recess 59 formed on the rear end side of the discharge valve. I was doing.

  However, the O-ring packing 60 as described above is configured to be pressed by the return spring 63 so as not to move along with the back-and-forth movement when the valve body 53 opens and closes. However, when there is no space for providing the recess 59 for accommodating the return spring 63 on the rear side of the valve sleeve 52, the clearance between the valve body 53 and the shaft hole 52a is processed into a minute numerical value to prevent gas leakage. However, this processing accuracy also varies, and there is a problem that the consumption of compressed gas is wasted.

  The present invention has been made in view of the above circumstances, and waste gas consumption is prevented by preventing the compressed gas used as the power source of the gas gun from leaking between the shaft portion and the shaft hole of the discharge valve. An object of the present invention is to provide a gas gun in which compressed gas is efficiently used.

  In order to solve the above problem, the gas gun according to claim 1 of the present invention is provided in the shaft hole of the valve case in the middle of the gas passage provided between the compressed gas supply source and the chamber for storing the bullet before firing. A discharge valve that moves back and forth is provided, and the rear end of the discharge valve is struck with a hammer so that the valve head moved forward is released from the valve seat provided in the valve case, thereby communicating with the opening in the valve seat. In a gas gun that opens the gas discharge port provided on the side of the valve chamber toward the gas passage and returns the discharge valve to the rear by a return spring provided in front of the valve head. The O-ring is fitted in close contact with the outer periphery of the sliding discharge valve shaft, and the pressure spring housed in the valve chamber via a washer for locking the O-ring is placed in front of the valve chamber of the valve case. By holding the valve seat fixed in close contact with the hammer, the O-ring in the valve chamber is energized by the pressing spring even when the hammer taps the rear end of the discharge valve and the discharge valve moves forward. The washer is pressed by the compressed gas flowing into the valve chamber from the opening in the valve seat while maintaining close contact with the rear end of the valve so that the entire circumference of the O-ring is uniformly deformed to exert a strong sealing performance. It is characterized by that.

  The gas gun according to claim 2 of the present invention is characterized in that, in claim 1, two gas discharge ports are formed on the side portion of the valve chamber of the valve case in a state of being separated in the front-rear direction.

  In the gas gun of the present invention, an O-ring that is in close contact with the outer periphery of the shaft portion of the discharge valve is fitted to the rear end of the valve chamber of the valve case, and a pressing spring is provided via a washer that locks the O-ring. The pressing spring is held by a valve seat fixed to the front portion of the valve chamber of the valve case. With such a configuration, even when the discharge valve moves forward by hitting the rear end of the discharge valve with a hammer, the O-ring in the valve chamber is brought into close contact with the rear end of the valve chamber by the bias of the return spring. It becomes possible to keep the state.

  Therefore, even when a gap is provided between the shaft hole of the valve case and the shaft portion of the discharge valve, the O-ring can be kept in close contact with the rear end of the valve chamber by the pressing spring. Further, when the washer is pressed by the compressed gas flowing into the valve chamber from the opening in the valve seat, the entire circumference of the O-ring is uniformly pushed by the pressing force of the washer and deformed. As a result, the cross section of the O-ring is deformed into a vertically long ellipse, and it becomes possible to exert a strong sealing performance by strengthening the adhesion to the outer periphery of the discharge valve. As a result, the compressed gas flowing into the valve chamber exhibits a synergistic sealing performance, thereby preventing the compressed gas from leaking from the shaft hole and eliminating the waste of compressed gas consumption. Become.

  In the present invention, the O-ring has a structure in which the O-ring for sealing the clearance of the shaft hole of the valve case and the space for storing the pressing spring for preventing the movement of the O-ring are provided on the valve chamber side of the valve case. Compared to a configuration in which the valve case is provided on the rear end side of the valve case, it is beneficial for downsizing the valve case.

  Furthermore, in the present invention, two gas discharge ports are formed at the front and rear sides of the valve chamber of the valve case, so that the compressed gas in the valve chamber reaches the rear of the valve chamber at the initial stage when the discharge valve is opened. The gas is discharged from the side gas discharge port to the gas passage. The compressed gas thus released is drawn into the valve chamber from the front gas discharge port by being sucked into the gas flow in the valve chamber, and is released again from the rear gas discharge port. Convection occurs.

  Next, when the discharge valve opens, the compressed gas increases the gas pressure in the valve chamber, and flows into the gas passage from the two gas discharge ports before and after the valve chamber all at once, reaching the chamber, and firing a bullet. As a result, the compressed gas flow can be smoothly used.

It is sectional drawing which shows the structure around the discharge valve of the gas gun which concerns on the Example of this invention. It is a figure which shows the discharge valve of the gas gun which concerns on the Example of this invention, (a) is a side view, (b) is a front view, (c) is a rear view, (d) is from a different direction from (a). FIG. (a)-(c) is an operation | movement figure of the discharge valve of the gas gun which concerns on the Example of this invention. (a), (b) is a figure which shows the flow of the compressed gas in the discharge valve of the gas gun which concerns on the Example of this invention. It is sectional drawing which shows the structure around the discharge | release valve | bulb which concerns on the conventional gas gun.

  Embodiments of the present invention will be described with reference to the drawings.

  First, the gas gun of this embodiment will be described. FIG. 1 is a cross-sectional view illustrating a structure around a discharge valve according to the present embodiment. In this figure, a magazine 4 communicating with a chamber 3 for holding a bullet B before firing in a standby state is formed in the grip 2 of the gun body 1.

  Further, a cylinder chamber 5 a in which a CO 2 cylinder 5 is mounted is provided in the grip 2 of the gun body 1. As another embodiment, in addition to using the CO2 cylinder 5, a gas pressure accumulation chamber (not shown) may be provided in the grip 2, and carbon dioxide gas may be directly injected into the gas pressure accumulation chamber.

  In such a configuration, a gas passage 7 is formed between the jet outlet 6 of the CO2 cylinder 5 as a compressed gas supply source and the chamber 3 holding the bullet B before firing. Further, in the middle of the gas passage 7, the outer peripheral screw portion 8 b of the valve case 8 is fixed by being screwed between members of the gas passage 7 and the space 14 in which the hammer 13 is provided.

  As shown in FIGS. 2A to 2D, the bubble case 8 has a neck portion 8a formed at the front portion and an annular groove 21b formed at the rear outer periphery of the outer peripheral screw portion 8b. When such a valve case 8 is fixed as described above, as shown in FIG. 4A, the front 0-ring 11a is fitted in the front annular groove 21a of the valve case 8, and the front 0-ring 11a is fitted. As a result, the path 12 leading to the gas passage 7 is closed.

  Further, a rear 0 ring 11b is fitted to the outer periphery of the annular groove 21b on the rear side of the valve case 8, and the path communicating the space 14 provided with the hammer 13 and the gas passage 7 is blocked by the rear 0 ring 11b. The

  Further, as shown in FIG. 3 (a), the discharge valve 10 has a valve head 16 formed at the front end of a shaft portion 15 that slides in a shaft hole 9 of a valve case 8 to be described later. Between the heads 16, a front shaft portion 15 a having a slightly reduced outer diameter than the shaft portion 15 is formed. In addition, the taper part 16a is formed in the rear part of the valve head 16 so that the valve head 16 may contact | adhere to the opening 18 of the valve seat 17 mentioned later.

  On the other hand, as shown in FIG. 3A, the inner cavity of the front end of the valve head 16 is sealed by fixing a valve seat 17 formed of resin such as polyacetal, and the discharge valve 10 is centered on the valve seat 17. An opening 18 through which the front shaft portion 15a is inserted with a gap is formed. With such a configuration, the opening 18 is closed when the tapered portion 16 a of the valve head 16 is seated on the front end of the opening 18.

  In addition, a valve chamber 19 having a cylindrical lumen is formed in the rear interior of the opening 18 of the valve seat 17, and a shaft hole 9 is formed in the center of a body portion 8 c provided at the rear portion of the valve case 8. The shaft portion 15 of the valve head 16 slides through the shaft hole 9.

  In the discharge valve 10, one end of the return spring 20 is fitted to the front of the discharge valve 10, that is, the front end protrusion 16 b of the discharge valve 10, while the other end of the return spring 20 faces the wall 22 ( (See FIG. 4). 4A, when the rear end of the shaft portion 15 of the discharge valve 10 is struck by the hammer 13 (see FIG. 1), the discharge valve 10 is subjected to the elastic force of the return spring 20. After moving against the front, it returns to the rear by the elastic force of the return spring 20. At this time, as shown in FIG. 3A, the tapered portion 16 a of the valve head 16 is seated on the front end of the opening 18 of the valve seat 17 to close the opening 18.

  In the above configuration, the O-ring 23 made of CO2-compatible rubber is fitted in close contact with the outer periphery of the shaft portion 15 of the discharge valve 10 that slides in the shaft hole 9 of the valve case 8. Further, a washer 24 for locking the O-ring 23 is provided in the valve chamber 19, and the pressing spring 25 housed in the valve chamber 19 is held by the valve seat 17 via the washer 24.

  4A, the hammer 13 strikes the rear end of the shaft portion 15 of the discharge valve 10 to move the discharge valve 10 forward, so that the inside of the valve chamber 19 The O-ring 23 can be kept in close contact with the rear end in the valve chamber 19 by the urging of the pressing spring 25.

  Therefore, even when a clearance is provided between the shaft hole 9 of the valve case 8 and the shaft portion 15 of the discharge valve 10, the O-ring 23 is moved in the valve chamber 19 by the pressing spring 25 provided in the valve chamber 19. It is possible to maintain a close contact with the end. Further, when the washer 24 is pressed by the compressed gas flowing into the valve chamber 19 from the opening 18 in the valve seat 17, the entire circumference of the O-ring 23 is evenly pressed and deformed by the pressing force of the washer 24. Thereby, the cross section of the O-ring 23 is deformed into a vertically long ellipse, and it becomes possible to exert a strong sealing performance by strengthening the adhesion to the outer periphery of the discharge valve 10.

  In the present invention, the pressing spring 25 provided in the valve chamber 19 gives a pressing action to hold the O-ring 23 in the valve chamber 19 in close contact with the rear end side in the valve chamber 19. is there. On the other hand, the return spring 20 provided at the tip of the discharge valve 10 gives an elastic force to return the discharge valve 10 backward after the discharge valve 10 struck by the hammer 13 moves forward. .

  Further, as shown in FIG. 4 (a), two gas discharge ports 26 a and 26 b provided in the side portion of the valve chamber 19 of the valve case 8 are formed in a state of being separated from the front and rear of the side portion of the valve chamber 19. By doing so, it becomes possible to smoothly flow the compressed gas from the initial state where the discharge valve 10 is opened until the discharge valve 10 is completely opened, and to flow in the direction of the gas passage 7. 4 (a) and 4 (b), the flow of the compressed gas is indicated by F.

  That is, at the initial stage when the discharge valve 10 is opened, the compressed gas in the valve chamber 19 is discharged from the gas discharge port 26b on the rear side to the gas passage 7 side. Immediately after that, as a result of being drawn into the valve chamber 19 from the gas discharge port 26a on the front side by being sucked by the gas flow in the valve chamber 19, smooth convection is released again from the gas discharge port 26b on the rear side. Arise.

  Next, as shown in FIG. 4B, when the release valve 10 is opened, the compressed gas increases the gas pressure in the valve chamber 19, and the two gas discharge ports 26 a and 26 b before and after the valve chamber 19. As a result of flowing into the gas passage side at a stroke and reaching the chamber 3 and being exerted as a thrust for firing a bullet, the flow of compressed gas can be made smooth.

  In the gas gun of the present invention, the compressed gas used as the power source of the gas gun is prevented from leaking from between the shaft portion and the shaft hole of the discharge valve, so that waste of gas consumption is eliminated and the compressed gas is used efficiently. It can be used as a gas gun.

DESCRIPTION OF SYMBOLS 1 Gun body 2 Grip 3 Chamber 4 Magazine 5 CO2 cylinder 5a Cylinder chamber 6 Jet port 7 Gas passage 8 Valve case 8a Neck part 8b Outer peripheral thread part 8c Body part 9 Shaft hole 10 Release valve 11a Front 0 ring 11b Rear 0 ring 12 Path 13 Hammer 14 Space 15 Shaft portion 15a Front shaft portion 16 Valve head 16a Tapered portion 16b Front end protrusion 17 Valve seat 18 Opening 19 Valve chamber 20 Return springs 21a and 21b Gas discharge port 22 Wall portion 23 O-ring 24 Washer 25 Pressing spring B Bullet
F Compressed gas flow

Claims (2)

A discharge valve that moves back and forth along the shaft hole of the valve case is provided in the middle of the gas passage provided between the compressed gas supply source and the chamber for storing the bullet before firing, and the rear end of the discharge valve is a hammer. By releasing the valve head moved forward by tapping from the valve seat provided in the valve case, the gas discharge port provided in the side portion of the valve chamber communicating with the opening in the valve seat is opened toward the gas passage. On the other hand, in a gas gun in which the discharge valve is returned backward by a return spring provided in front of the valve head,
The O-ring is fitted in close contact with the outer periphery of the shaft of the discharge valve that slides in the shaft hole of the valve case, and the pressure spring stored in the valve chamber via a washer for locking the O-ring is connected to the valve case valve. By holding the valve seat fixed in close contact with the front of the chamber, the O-ring in the valve chamber is attached to the pressure spring even when the hammer taps the rear end of the discharge valve and the discharge valve moves forward. Strong sealing performance is maintained by keeping the state in close contact with the rear end of the valve chamber by the force, and the washer is pressed by the compressed gas flowing into the valve chamber from the opening in the valve seat, and the entire circumference of the O-ring is uniformly deformed A gas gun characterized by its 2. The gas gun according to claim 1, wherein two gas discharge ports are formed on a side portion of the valve chamber of the valve case in a state of being separated from each other in the front-rear direction.