JP6145770B2 - Blowback gas gun - Google Patents

Description

  The present invention relates to a blowback gas gun for play, in which a compressed gas is prevented from leaking when a piston fixed to the slide slides inside a cylinder.

  2. Description of the Related Art Conventionally, a blowback gas gun has been developed in which a slide is retracted as a bullet is fired in a game gas gun that fires a BB bullet with compressed gas.

  Regarding the structure of the piston provided inside the slide in such a conventional blowback gas gun, the paragraphs [0020] and [0021] of the specification of Patent Document 1 include a slider (referred to as “slide” in the present invention). A configuration is described in which a piston is slidably provided in a cylinder portion provided integrally with the cylinder, and an O-ring is provided as a seal member on the outer periphery of the tip of the piston.

  In the structure of the cylinder and piston in the above-mentioned patent document, an O-ring (hereinafter referred to as “piston packing” in the present invention) is usually fixed by fitting into an annular groove formed on the outer periphery of a cylindrical piston. It is configured to do.

  However, in such a structure in which the piston packing is fixed to the outer periphery of the piston, when the axis of the piston moving in the cylinder does not coincide with the axis of the cylinder, the axis of the piston packing also does not coincide with the axis of the cylinder. It will be.

  In this case, eccentricity occurs in the piston packing that moves along the inner periphery of the cylinder, so that compressed gas leaks from the gap formed between the piston packing and the cylinder, and the gas pressure that presses the piston is insufficient. Will slow down.

  In addition, when the piston is fixed to the slide with the axis of the piston moving in the cylinder not aligned with the axis of the cylinder, the piston packing is frictional when moving in contact with the inner periphery of the slide in an eccentric state. A force is generated, and the frictional force reduces the speed of the slide blowback operation.

  To solve this problem, the piston shaft in the cylinder is made to coincide with the cylinder shaft, and the piston packing slides in the cylinder evenly in contact with the inner circumference of the cylinder. It is necessary to let

  However, since the above structure requires clearance when assembling the gun, even if it is possible to match the axis of the cylinder and piston in the design, it is difficult to realize with an actual product, The piston is fixed to the slide in an eccentric state inside the cylinder.

JP 2002-168593 A

  The present invention has been made in view of the above circumstances, and in a blowback gas gun for play, when sliding inside the cylinder with the piston fixed to the slide, the axial centers of the cylinder and piston packing are arranged. An object of the present invention is to provide a blowback gas gun which can prevent the compressed gas from leaking by making them coincide, and can perform the blowback backward operation quickly.

  In order to achieve the above-described object, the blowback gas gun according to claim 1 of the present invention is configured such that when a bullet is fired, the piston fixed to the slide is fixed to the cylinder by the pressure of the compressed gas supplied into the cylinder in front of the piston. In a blowback gas gun for play that is configured to retreat along the inner periphery, a shaft portion is formed to protrude from the front end of the piston stored with a clearance in the inner periphery of the cylinder, and a clearance is provided in the outer periphery of the shaft portion to provide a collar. Is attached to the annular groove formed in the outer periphery of the collar, and the piston head is coupled to the front end of the shaft portion of the piston, so that the collar is surrounded by the clearance around the shaft portion. By making it movable in the direction, it is configured so that the axis of the piston packing that slides in the cylinder matches the axis of the cylinder, and The piston head coupled to the shaft portion of the serial piston, characterized by having a protruding shape in a curved shape toward the front of the gun body.

According to a second aspect of the present invention, the blowback gas gun according to the first aspect is configured such that the piston packing has a shape in which the peripheral portion of the piston packing protrudes in an inclined manner toward the front of the gun body, and is supplied to the front of the piston. It is characterized in that when the peripheral portion of the piston packing rises in the outer peripheral direction due to the pressure of the gas, the peripheral portion of the piston packing is in close contact with the inner periphery of the cylinder.

According to a third aspect of the present invention, the blowback gas gun according to the first or second aspect is characterized in that the collar and the piston packing are integrally formed of a synthetic resin material having elasticity.

  The blowback gas gun of the present invention has a shaft protruding from the front end of a piston accommodated with a clearance on the inner periphery of the cylinder, and a collar is mounted on the outer periphery of the shaft to form the outer periphery of the collar. An elastic piston packing is fitted into the annular groove. Furthermore, the piston head is coupled to the front end of the piston shaft, and the collar attached to the shaft is movable in the circumferential direction of the shaft.

  With such a configuration, even if the axis of the piston fixed to the slide is shifted from the axis of the cylinder, the axis of the piston packing that slides in the cylinder matches the axis of the cylinder. Thus, the piston packing can move in the cylinder without any eccentricity with respect to the cylinder.

  In addition, since the axis of the piston packing that slides in the cylinder coincides with the axis of the cylinder as described above, the piston packing can move in the slide without any eccentricity. It is difficult to generate a frictional force for braking, and it is possible to quickly perform a blowback operation.

  In the present invention, the piston head coupled to the shaft portion of the piston has a shape protruding in a curved shape toward the front of the gun body. For this reason, the compressed gas supplied to the front of the piston flows in the direction of the piston packing along the curved shape of the piston head.

  Further, in the present invention, since the peripheral portion of the piston packing has a shape protruding in an inclined manner toward the front of the gun body, the compressed gas flowing in the direction of the piston packing presses the peripheral portion of the piston packing, The outer periphery of the packing is deformed in an expanding direction. For this reason, the peripheral part of piston packing closely_contact | adheres to the inner periphery of a cylinder, and it becomes possible to improve the sealing performance with respect to the inner periphery of a cylinder. Therefore, it is possible to quickly perform the blowback operation by efficiently pressing the piston rearward without the compressed gas filled in front of the piston leaking from the outer periphery of the piston packing.

  Furthermore, in the present invention, it is possible to simplify the structure by integrally forming the collar and the piston packing with a synthetic resin material having elasticity.

It is sectional drawing of the blowback gas gun which concerns on the Example of this invention, (a) is whole sectional drawing, (b) is a principal part expanded sectional view. It is sectional drawing which shows the state which accommodated the piston in the cylinder which concerns on the Example of this invention, (b) is sectional drawing which shows a piston and its periphery. It is a disassembled side view of the piston which concerns on the Example of this invention. It is a longitudinal cross-sectional view of the piston which concerns on the Example of this invention. It is an external view of the piston which concerns on the Example of this invention, (a) is a front view, (b) is a side view, (c) is a rear view.

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

  As shown in FIGS. 1A and 1B, the blowback gas gun 1 of the present embodiment is slid by the pressure of the compressed gas supplied into the cylinder 4 in front of the piston 2 when the bullet B is fired. 3 is a blowback gas gun for play having a structure in which a piston 2 fixed to 3 is retracted along the inner periphery of a cylinder 4.

  The blowback gas gun 1 has a compressed gas loaded in a gas cylinder 6 or a gas chamber as a compressed gas supply source in a grip 5 of the gun body, and a magazine 7 is formed in front of the gas cylinder 6. A valve case 8 is fixed above the jet nozzle 6 a of the gas cylinder 6, and a gas discharge valve 10 that opens and closes the gas passage 9 is provided in the valve case 8.

  In such a configuration, as shown in FIG. 1B, the hammer 12 strikes the valve hammer piece 13 by pulling the trigger 11, and the gas release valve 10 is pushed by the valve hammer piece 13. Next, the compressed gas passes through the gas passage 9, and flows into the cylinder 4 through the gas inlet 4 a of the cylinder 4 from the outlet 14 a of the magazine packing 14 provided at the upper portion of the gas passage 9.

  A piston 2 moving in the cylinder 4 is fixed inside the rear of the slide 3, and the compressed gas flowing into the cylinder 4 as described above presses the front of the piston 2 and presses the piston 2 backward. As a result, a blowback operation for moving the slide 3 fixed to the piston 2 backward is performed.

  FIG. 2 shows a configuration in which the cylinder 4 and the piston 2 inside the blowback gas gun 1 shown in FIG. 1A are taken out, and FIG. 2B is an enlarged view of the piston 2 and its peripheral portion. . As shown in FIGS. 2A and 2B, the piston 2 is housed in the inner periphery of the cylinder 4 with a clearance C1.

  Further, as shown in FIG. 3, a shaft section 15 having a circular cross section is formed to protrude from the front end of the piston 2. Further, as shown in FIG. 4, a collar 16 is mounted on the outer periphery of the shaft portion 15 with a minute clearance C <b> 2, and an elastic piston packing 18 is fitted in an annular groove 17 formed on the outer periphery of the collar 16. (See FIG. 2 (b)).

  In the above configuration, as shown in FIG. 2 (b), the collar 16 attached to the shaft portion 15 is connected by connecting the piston head 19 to the front end of the shaft portion 15 of the piston 2 housed in the cylinder 4. The shaft portion 15 is locked in a movable state in the circumferential direction.

  Here, the configuration of the piston 2 of the present embodiment will be described. As shown in FIG. 3, the piston main body 2a, the collar 16, the piston packing 18, and the piston head 19 are configured separately. Further, a male screw 20a is formed on the outer periphery of the shaft member 20 that protrudes rearward from the piston head 19, and is formed from the center of the front end of the shaft portion 15 of the piston 2a toward the rear as shown in FIG. A female screw 22 a is formed around the hole 22. Further, a shaft hole 20b is formed in the center of the shaft member 20 from the front end inward, and the shaft hole 20b communicates with the hole portion 22 of the shaft portion 15 of the piston 2a.

  With such a configuration, as shown in FIG. 4, the inner periphery of the collar 16 is mounted on the outer periphery of the shaft portion 15 of the piston 2 with the piston packing 18 fitted in the annular groove 17 of the collar 16. Since the inner diameter of the collar 16 is slightly larger than the outer diameter of the shaft portion 15 of the piston 2, the collar 16 is attached to the outer periphery of the shaft portion 15 of the piston 2 as described above. The collar 16 is mounted with a clearance C2 on the outer periphery of the shaft portion 15 of the piston 2.

  Next, by screwing the shaft member 20 of the piston head 19 into the hole 22 of the piston 2, the male screw 20a of the shaft member 20 and the female screw 22a of the hole 22 are screwed together. 2 (see FIG. 5). At this time, the length of the shaft portion 15 is slightly longer than the thickness of the collar 16 so that the collar 16 fitted with the piston packing 18 can have some clearance C3 in the front-rear direction of the shaft portion 15. I am doing so. A screw groove 21 is formed in the diameter direction at the front end of the piston head 19, and the piston head 19 is screwed by fitting a predetermined tool into the screw groove 21.

  In such a configuration, as shown in FIGS. 2 (a) and 2 (b), the piston packing 18 has an outer diameter that uniformly contacts the inner periphery of the cylinder 4, and the peripheral portion 18a of the piston packing 18 is a gun body. It is formed in the shape which protruded in the inclined shape toward the front of. The constituent material of the piston packing 18 may be made of a synthetic resin material such as polyacetal in addition to rubber as an elastic material having elasticity. As a commercially available polyacetal, Duracon (trade name) manufactured by Polyplastics Co., Ltd. is known. In the present embodiment, the collar 16 and the piston packing 18 may be integrally formed of a synthetic resin material having elasticity. By doing so, it is possible to simplify the structure, which is also beneficial for reducing manufacturing costs.

  With such a configuration, even if the axis of the piston 2 fixed to the slide 3 is displaced from the axis of the cylinder 4 as shown in FIG. Since the axis of the piston packing 18 that matches the axis of the cylinder 4 can move within the cylinder 4 without the eccentricity of the piston packing 18 relative to the cylinder 4, it prevents leakage of compressed gas. It becomes possible to do. In addition, since the piston packing 18 of the present embodiment is movable in the circumferential direction inside the cylinder 4, the piston packing 18 has the performance of moving itself to a position where it receives the gas pressure of the compressed gas evenly. The axial center of the packing 18 moves in a direction that coincides with the axial center of the cylinder 4.

  Further, as described above, when the axis of the piston packing 18 that slides in the cylinder 4 coincides with the axis of the cylinder 4, the piston packing 18 can be moved in the slide 4 without being eccentric. Therefore, the frictional force that brakes the blowback of the slide 4 hardly occurs, and the blowback operation can be performed quickly.

  In this embodiment, the piston head 19 coupled to the shaft portion 15 of the piston 2 has a shape protruding in a curved shape toward the front of the gun body. For this reason, the compressed gas supplied to the front of the piston 2 flows in the direction of the piston packing 18 along the curved shape of the piston head 9.

  Furthermore, in the present embodiment, the peripheral portion 18a of the piston packing 18 has a shape protruding in an inclined manner toward the front of the gun body, so that the compressed gas flowing in the direction of the piston packing 18 18a is pressed and it deform | transforms in the direction which expands the outer periphery of piston packing 18. As shown in FIG.

  For this reason, the peripheral portion 18a of the piston packing 18 is brought into close contact with the inner periphery of the cylinder 4, and the sealing performance with respect to the inner periphery of the cylinder 4 can be improved. Then, the compressed gas filled in front of the piston 2 does not leak from the outer periphery of the piston packing 18, and the piston 2 can be efficiently pushed backward to perform the blow-back operation of the slide 3. It becomes.

  The blowback gas gun of the present invention is a blowback gas gun for play. When sliding inside the cylinder while the piston is fixed to the slide, the compressed gas leaks by aligning the axis of the cylinder and the piston packing. Therefore, the blowback gas gun can be used to prevent the back-up and to quickly perform the reverse operation of the blowback.

DESCRIPTION OF SYMBOLS 1 Blowback gas gun 2 Piston 2a Piston main body 3 Slide 4 Cylinder 4a Gas inlet 5 Grip 6 Gas cylinder 6a Outlet 7 Magazine 8 Valve case 9 Gas passage 10 Gas discharge valve 11 Trigger 12 Hammer 13 Valve hammer piece 14 Magazine packing 14a Outlet 15 Shaft portion 16 Collar 17 Annular groove 18 Piston packing 18a Circumferential portion 19 Piston head 20 Shaft member 20a Male screw 20b Shaft hole 21 Screw groove 22 Hole portion 22a Female screw B Bullet C1, C2, C3 Clearance

Claims (3)

In a blowback gas gun for play, in which the piston fixed to the slide is retracted along the inner periphery of the cylinder by the pressure of the compressed gas supplied into the cylinder in front of the piston when the bullet is fired. A shaft part is projected and formed at the front end of the piston stored with a clearance around the circumference, a collar is mounted with a clearance around the outer periphery of the shaft part, and an elastic piston packing is fitted into an annular groove formed on the outer periphery of the collar In addition, by connecting the piston head to the front end of the shaft part of the piston, the collar can be moved in the circumferential direction by the clearance around the shaft part. The piston head that is configured to match the axial center of the cylinder and that is coupled to the shaft portion of the piston is curved toward the front of the gun body. Blowback gas gun, characterized in that it has a protruding shape. The shape of the piston packing is such that the periphery of the piston packing protrudes in an inclined manner toward the front of the gun body, and when the periphery of the piston packing rises in the outer peripheral direction due to the pressure of the compressed gas supplied to the front of the piston 2. The blowback gas gun according to claim 1, wherein a peripheral portion of the piston packing is in close contact with an inner periphery of the cylinder. The blowback gas gun according to claim 1 or 2, wherein the collar and the piston packing are integrally formed of a synthetic resin material having elasticity.