EP3708943A1

EP3708943A1 - Friction reduction device to reduce friction between piston and cylinder in gas-type replica guns

Info

Publication number: EP3708943A1
Application number: EP17931574.2A
Authority: EP
Inventors: Iwao Iwasawa
Original assignee: Tokyo Marui Co Ltd
Current assignee: Tokyo Marui Co Ltd
Priority date: 2017-11-08
Filing date: 2017-11-08
Publication date: 2020-09-16
Anticipated expiration: 2037-11-08
Also published as: TW201918685A; TWI795459B; WO2019092820A1; JP7006965B2; EP3708943A4; JPWO2019092820A1; EP3708943B1

Abstract

To provide a friction reduction device to reduce fri ction between a piston and a cylinder. A friction reductio n device to reduce friction between a piston and a cylinde r has a piston into which a gas flows and that retracts in order to load the next bullet, a cylinder that accommodat es the piston so same can move, and a piston rolling body that is rotatably disposed in the piston. The piston rolli ng body is rotated by the piston rolling body rotatably di sposed in the piston being in contact with the interior of the cylinder when the piston is retracting.

Description

Technical Field

The present invention relates to a friction reducing device for reduction of friction between a piston and a c ylinder in a gas type mock gun.

Background Art

Regarding a mock gun in the related art, there is a so-called gas gun in which a gun main body is filled with compressed gas in a cylinder and the compressed gas is injected toward a bullet such that the bullet is fired. Furthermore, there is a mock gun of which a slide performs a so-called blowback operation, in which the slide is moved backward such that a next bullet is loaded when a bullet is fired, so that the mock gun is caused to perform a motion like a real gun at that time.
For example, Japanese Unexamined Patent Application Publication No. 2014-240722 discloses a blowback gas gun for amusement in which a cylinder and piston packing are made coaxial with each other when a piston slides inside the cylinder in a state of being fixed to a slide such that leakage of compressed gas is prevented and a backward motion in a blowback operation can be quickly performed. The blowback gas gun is a blowback gas gun for amusement in which a piston fixed to a slide is moved backward along an inner periphery of a cylinder due to the pressure of compressed gas supplied to the inside of the cylinder ahead of the piston when a bullet is fired, a shaft portion is formed to protrude at a front end of the piston accommodated with a clearance formed between the inner periphery of the cylinder and the piston, a collar is mounted with a clearance formed between an outer periphery of the shaft portion and the collar, elastic piston packing is fitted into an annular groove formed on an outer periphery of the collar, and a piston head portion is coupled to a front end of the shaft portion of the piston such that the collar is made movable in a circumferential direction by a distance corresponding to a clearance around the shaft portion and thus the piston packing sliding inside the cylinder is made coaxial with the cylinder.
However, the above-described invention is for compressed gas leakage prevention rather than prevention of so-called misalignment in which a gap between a cylinder and a piston is made appropriate. Accordingly, deviation thereof cannot be prevented and there is a case where friction occurs between a piston moving backward so that a next bullet is loaded and a cylinder being in contact with the piston and the cylinder is worn in a gas type mock gun particularly when the gas type mock gun is used for a long time. Particularly, this is because the cylinder is made of synthetic resin.

Citation List

Patent Literature

[Patent Citation 1] Japanese Unexamined Patent Application Publication No. 2014-240722

Disclosure of Invention

Technical Problem

The present invention has been made in view of the a bove circumstances and an object thereof is reduction of p iston-to cylinder friction.

Technical Solution

According to a first aspect of the invention, there is provided a friction reducing device for reduction of friction between a piston and a cylinder including a piston into which gas flows and that moves backward so that a next bullet is loaded, a cylinder that accommodates the piston with the piston made movable, and a piston rolling body that is rotatably disposed at the piston. When the piston moves backward, the piston rolling body that is rotatably disposed at the piston comes into contact with an internal portion of the cylinder and the piston rolling body rotates.
According to a second aspect of the invention, in the friction reducing device for reduction of friction between a piston and a cylinder related to the first aspect, the piston rolling body may include a axle portion that is rotatable and disposed in a horizontal direction and wheel portions that are disposed at opposite ends of the axle portion.
According to a third aspect of the invention, in the friction reducing device for reduction of friction between a piston and a cylinder related to the first aspect, the piston rolling body may include a second axle portion that is disposed in a horizontal direction and serves as a shaft and a second wheel portion that is disposed on the second axle portion, and the second axle portion that serves as the shaft may be disposed at a center of the second wheel portion.
According to a fourth aspect of the invention, there is provided a friction reducing device for reduction of friction between a piston integrally coupled with a slider and a cylinder including a piston into which gas flows and that moves backward so that a next bullet is loaded, a slider that is integrally coupled with the piston, a cylinder that accommodates the piston with the piston made movable, and a slider rolling body that is rotatably disposed at the slider. When the piston moves backward and the slider integrally coupled with the piston moves backward, the slider rolling body that is rotatably disposed at the slider comes into contact with an external portion of the cylinder and the slider rolling body rotates and friction between the piston integrally coupled with the slider and the cylinder is reduced.
According to a fifth aspect of the invention, in the friction reducing device for reduction of friction between a piston and a cylinder related to the fourth aspect, the slider rolling body may include a slider axle portion that is rotatable and disposed in a horizontal direction and slider wheel portions that are disposed at opposite ends of the slider axle portion.
According to a sixth aspect of the invention, in the friction reducing device for reduction of friction between a piston and a cylinder related to the fourth aspect, the slider rolling body may include a second slider axle portion that is disposed in a horizontal direction and serves as a shaft and a second slider wheel portion that is disposed on the second slider axle portion, and the second slider axle portion that serves as the shaft may be disposed at a center of the second slider wheel portion.
According to a seventh aspect of the invention, there is provided a blowback gas type mock gun including the friction reducing device for reduction of friction between a piston and a cylinder related to any one of the first to third aspects.
According to an eighth aspect of the invention, there is provided a blowback gas type mock gun including the friction reducing device for reduction of friction between a piston and a cylinder related to any one of the fourth to sixth aspects.
According to a ninth aspect of the invention, there is provided a blowback gas type mock gun including the fri ction reducing device for reduction of friction between a piston and a cylinder related to any one of the first to t hird aspects and the friction reducing device for reductio n of friction between a piston and a cylinder related to a ny one of the fourth to sixth aspects.

Advantageous Effects

Since the present invention is configured and acts a s described above, friction between a piston and a cylinde r can be reduced.

Brief Description of Drawings

Fig. 1 is an overall sectional view of a gas type mock gun including a friction reducing device in a first example.
Fig. 2A is a partial enlarged view of the gas type mock gun including the friction reducing device in the first example and Fig. 2B is a partial sectional view taken alone line 2B of Fig. 2A.
Fig. 3A is an overall sectional view of the gas type mock gun including the friction reducing device in the first example in a state where a bullet moves inside a barrel and Fig. 3B is an enlarged sectional view of the friction reducing device in the first example in a state as shown in Fig. 3A.
Fig. 4A is an overall sectional view of the gas type mock gun including the friction reducing device in the first example in a state where a bullet is fired and Fig. 4B is an enlarged sectional view of the friction reducing device in the first example in a state as shown in Fig. 4A.
Fig. 5A is an overall sectional view of the gas type mock gun including the friction reducing device in the first example in a state where a bullet is fired and a piston is moved backward and Fig. 5B is an enlarged sectional view of the friction reducing device in the first example in a state as shown in Fig. 5A.
Fig. 6A is an overall sectional view of the gas type mock gun including the friction reducing device in the first example in a state where a next bullet is disposed and Fig. 6B is an enlarged sectional view of the friction reducing device in the first example in a state as shown in Fig. 6A.
Fig. 7A is a partial enlarged view of a gas type mock gun including a friction reducing device in a second example and Fig. 7B is a partial sectional view taken alone line 7B of Fig. 7A.
Fig. 8A is a partial enlarged view of a gas type mock gun including a friction reducing device in a third example and Fig. 8B is a partial sectional view taken alone line 8B of Fig. 8A.
Fig. 9A is an overall sectional view of the gas type mock gun including the friction reducing device in the third example in a state where a bullet moves inside a barrel and Fig. 9B is an enlarged sectional view of the friction reducing device in the third example in a state as shown in Fig. 9A.
Fig. 10A is an overall sectional view of the gas type mock gun including the friction reducing device in the third example in a state where a bullet is fired and Fig. 10B is an enlarged sectional view of the friction reducing device in the third example in a state as shown in Fig. 10A.
Fig. 11A is an overall sectional view of the gas type mock gun including the friction reducing device in the third example in a state where a bullet is fired and a piston is moved backward and Fig. 11B is an enlarged sectional view of the friction reducing device in the third example in a state as shown in Fig. 11A.
Fig. 12A is an overall sectional view of the gas type mock gun including the friction reducing device in the third example in a state where a next bullet is disposed and Fig. 12B is an enlarged sectional view of the friction reducing device in the third example in a state as shown in Fig. 12A.
Fig. 13A is a partial enlarged view of a gas type mo ck gun including a friction reducing device in a fourth ex ample and Fig. 13B is a partial sectional view taken alone line 13B of Fig. 13A.

Hereinafter, a friction reducing device in a first example will be described with reference to an embodiment shown in drawings. A friction reducing device 10A in the first example is disposed in a blowback gas type mock gun 100 and includes a piston 20 into which compressed gas flows and that moves in a backward direction so that a next bullet is loaded, a cylinder 30 that accommodates the piston 20 with the piston 20 made movable, and a piston rolling body 40 rotatably disposed at the piston 20. With the piston rolling body 40 rotating, friction between the piston 20 and the cylinder 30 is reduced and thus wear of the cylinder 30 is reduced. That is, when a magazine including bullets B is loaded into the gas type mock gun 100, the piston 20 is not pressed while the cylinder 30 is pressed upward and thus there is a problem that a lower portion 20a of the piston 20 becomes relatively close to the cylinder 30 and a gap between the piston 20 and the cylinder 30 becomes small. However, since the piston rolling body 40 is provided, the gap between the piston 20 and the cylinder 30 is made appropriate and so-called misalignment between the piston 20 and the cylinder 30 is solved and thus friction between the piston 20 and the cylinder 30 is reduced and wear of the cylinder 30 is reduced as described above. Here, a blowback operation is an operation of automatically loading a bullet B1 to be fired after the fired bullet B and is an operation performed in a rear gun. Note that, although the gas type mock gun 100 has a configuration different from that of a real gun, an external operation and an effect that a next bullet to be fired next is loaded are realized in a mock manner.
Here, the gas type mock gun 100 will be described in detail later and is a mock gun called a gas gun that discharges so-called compressed gas to fire the bullet B from a muzzle 110.
Regarding the friction reducing device 10A, the piston 20 is disposed in the cylinder 30 such that the piston 20 can be moved backward (moved rightward in Fig. 1) by means of the pressure of the compressed gas as described later. In addition, the piston 20 includes a piston main body 21, elastic ring-shaped piston packing 22 that is disposed at a tip end of the piston main body 21, and a screw portion 23 that fixes the piston packing 22 to the piston main body 21. Airtightness between the piston 20 and the cylinder 30 is secured by means of the piston packing 22. Furthermore, a piston rolling body holding portion 24 that rotatably holds the piston rolling body 40 and a fixation portion 25 for fixing the piston rolling body holding portion 24 to the piston main body 21 are provided. Note that, as the fixation portion 25, a screw can be used.
The inside of the cylinder 30 is tubular. In addition, when gas discharged into a flow path 123 which will be described later flows into the cylinder 30, the piston 20 accommodated therein is moved in a backward direction.
The piston rolling body 40 rotates in accordance with movement of the piston 20 as described above, includes a rotatable axle portion 41 that is disposed in a horizontal direction and wheel portions 42 and 42 disposed at opposite ends thereof as in the case of wheels of a train, and is rotatably fixed to the piston main body 21 by the piston rolling body holding portion 24. In addition, surfaces 43 and 43 of the wheel portions 42 and 42 that are in contact with the cylinder 30 have curved shapes conforming to an inner circumferential surface of the cylinder 30. Therefore, the wheel portions 42 and 42 are in contact with the inner circumferential surface of the cylinder 30 at the surfaces thereof (refer to Figs. 2A and 2B).
Here, the operation of the gas type mock gun 100 and the operation of the friction reducing device 10A configured as described above will be described together. A so-called cocking operation is performed in a state as shown in Fig. 2A and Fig. 2B such that the bullet B to be fired first is engaged with an engagement portion 127. Next, when a trigger 120 is pulled, a closed first on-off valve 122 is moved by a member (not shown) and thus liquefied gas with which a tank 121 is filled in advance is vaporized and gas thereof is discharged to the flow path 123 from the first on-off valve 122.
A spring 124 urges a second on-off valve 125 in a direction opposite to the muzzle 110 (rightward direction in drawing). That is, the second on-off valve 125 is urged such that the second on-off valve 125 is made open. In this state, the gas discharged to the flow path 123 passes through the second on-off valve 125 in an opened state, passes through a nozzle 126, and is injected toward the bullet B engaged with the engagement portion 127. Note that, the engagement portion 127 has elasticity.
The bullet B toward which the gas is injected rapidly moves inside a barrel 128 that has a tubular structure and is for firing the bullet B. Note that, at that time, the piston 20 is disposed in the cylinder 30 and the piston 20 is disposed on a left side in the drawing (refer to Figs. 3A and 3B), inside the cylinder 30.
The bullet B toward which the gas is injected passes through the barrel 128 that has a tubular structure and is for firing the bullet B and the bullet B is fired through the muzzle 110. Note that, at a time point when the gas discharged to the flow path 123 passes through the second on-off valve 125 in the opened state as described above, the second on-off valve 125 rides on a gas stream and moves in a direction toward the muzzle 110 against an urging force of the spring 124. Since adjustment is performed such that the second on-off valve 125 is closed at a timing at which the bullet B is separated from the muzzle 110, the second on-off valve 125 is closed when the bullet B is fired through the muzzle 110. Therefore, the second on-off valve 125 is closed and thus no gas flows into the barrel 128 and gas flows into the cylinder 30 at this time.
When the gas flows into the cylinder 30, the piston 20 moves rightward in the drawing (refer to Figs. 4A and 4B). Due to the movement of the piston 20, the piston rolling body 40 rotates.
Furthermore, when the gas flows into the cylinder 30, the piston 20 moves rightward in the drawing (refer to Figs. 5A and 5B). Due to the movement of the piston 20, the piston rolling body 40 further rotates. When being withdrawn maximally, the piston 20 is moved backward (moved rightward in drawing) further than a rear end opening 31 of the cylinder 30. Note that, the piston 20 and a slider 130 are integrally coupled with each other at rear portions thereof. Therefore, the slider 130 is also moved backward as with the piston 20. In addition, at the same time, a gun main body 150 integrally coupled with the slider 130 moves backward and thus a main body spring 151 is compressed. In addition, the nozzle 126 integrally coupled with the slider 130 also moves backward (refer to Figs. 5A and 5B).
At that time, a bullet opening portion 140 is opened and the bullet B1, which is positioned uppermost from among a plurality of the bullets B urged to be raised by a bullet spring 141, is to be fired next, and is the next bullet, is further raised.
As the compressed main body spring 151 restores the natural length thereof, the slider 130 moves forward (leftward in drawing), that is, in a direction to the muzzle 110, the piston rolling body 40 rotates reversely, and the piston 20 moves leftward in the drawing (refer to Figs. 6A and 6B). At that time, the bullet B1 which is positioned uppermost from among the plurality of bullets B is moved by the nozzle 126 due to movement of the nozzle 126 in the direction to the muzzle 110 and the bullet B1 is engaged with the engagement portion 127. In this manner, the bullet B1, which is the next bullet, is loaded through a so-called blowback operation. The above-described operation is repeated in this manner each time the bullet B is fired.
Here, the above-described operation is repeated each time the bullet B is fired and the operation is momentary. Therefore, according to the friction reducing device 10A in the present example, friction between the piston 20 and the cylinder 30 can be reduced as much as possible with rotation of the piston rolling body 40 and wear caused by the friction can be prevented. Note that, it is a matter of course that so-called misalignment of the piston 20 and the cylinder 30 is prevented since the piston rolling body 40 is provided as described above.
Next, a friction reducing device 10B in a second example will be described. Note that, the configuration of the gas type mock gun 100 is the same as the configuration described above except for the friction reducing device 10B and thus the description thereof will be omitted. Regarding the friction reducing device 10B, a second piston rolling body 400 rotating between a second piston 200 and a second cylinder 300 for a blowback operation is disposed to reduce friction between the second piston 200 and the second cylinder 300. That is, when a magazine including the bullets B is loaded into the gas type mock gun 100, the second piston 200 is not pressed while the second cylinder 300 is pressed upward and thus there is a problem that a lower portion 200a of the second piston 200 becomes relatively close to the second cylinder 300 and a gap between the second piston 200 and the second cylinder 300 becomes small. However, since the second piston rolling body 400 is provided, the gap between the second piston 200 and the second cylinder 300 is made appropriate and so-called misalignment between the second piston 200 and the second cylinder 300 is solved and thus friction between the second piston 200 and the second cylinder 300 is reduced and wear of the second cylinder 300 is reduced as described above.
Regarding the friction reducing device 10B, as with the piston 20, the second piston 200 is disposed in the second cylinder 300 such that the second piston 200 can be moved in a backward direction (rightward direction in Fig. 7A) by means of the pressure of the compressed gas. In addition, the second piston 200 includes a second piston main body 210, elastic ring-shaped second piston packing 220 for blocking compressed gas that is disposed at a tip end of the second piston main body 210, and a second screw portion 230 that fixes the second piston packing 220 to the piston second main body 210. Furthermore, a second piston rolling body holding portion 240 that rotatably holds the second piston rolling body 400 and a second fixation portion 250 for fixing the second piston rolling body holding portion 240 to the second piston main body 210 are provided. Note that, as the second fixation portion 250, a screw can be used.
In addition, the second cylinder 300 is the same as the cylinder 30 in the friction reducing device 10A. However, it will be described just in case that the second cylinder 300 is tubular and the second piston 200 is moved in a backward direction when gas discharged into the flow path 123 which will be described later flows into the second cylinder 300.
The second piston rolling body 400 rotates in accordance with movement of the second piston 200 as described above and includes a second axle portion 410 that is disposed in a horizontal direction and serves as a shaft and a substantially circular second wheel portion 420 that is disposed on the second axle portion 410 and rotates together with the second axle portion 410 as in the case of a wheel of a monocycle. The second axle portion 410 that serves as a shaft and the second wheel portion 420 may not rotate together and may rotate independently of each other. In addition, the second axle portion 410 that serves as a shaft is in a state of being disposed at the center of the substantially circular second wheel portion 420 and the second piston rolling body holding portion 240 is disposed such that the second wheel portion 420 can rotate with respect to the second axle portion 410 disposed in the horizontal direction, as shown in Fig. 7B.
Regarding the second piston rolling body holding portion 240, the second wheel portion 420 is rotatably fixed to the second piston main body 210 by a second piston rolling body fixation portion 250. In addition, a surface 430 of the second wheel portion 420 that is in contact with the second cylinder 300 has a curved shape conforming to an inner circumferential surface of the second cylinder 300 (refer to Fig. 7B). Therefore, the second wheel portion 420 is in contact with the inner circumferential surface of the second cylinder 300 at the curved surface.
According to the friction reducing device 10B in the second example configured as described friction between the second piston 200 and the second cylinder 300 can be reduced as much as possible with rotation of the second piston rolling body 400 and wear caused by the friction can be prevented. Note that, it is also a matter of course that so-called misalignment of the second piston 200 and the second cylinder 300 is prevented since the second piston rolling body 400 is provided as described above.
In addition, a friction reducing device 10C in a third example will be described. The friction reducing device 10C in the third example is disposed in another gas type mock gun 101 and a third piston 500 into which compressed gas flows and that moves in a backward direction so that a next bullet to be fired next is loaded, a third slider 600 that is integrally coupled with the third piston 500 at a rear portion thereof and moves backward in accordance with movement of the third piston 500 in a backward direction, a third cylinder 700 that accommodates the third piston 500 with the third piston 500 made movable, and a slider rolling body 800 rotating between the third slider 600 and the third cylinder 700 are disposed such that friction between the third piston 500 integrally coupled with the third slider 600 and the third cylinder 700 is reduced and thus wear of the third cylinder 700 is reduced. That is, when a magazine including the bullets B is loaded into the other gas type mock gun 101, the third piston 500 is not pressed while the third cylinder 700 is pressed upward and thus there is a problem that a third lower portion 500a of the third piston 500 becomes relatively close to the third cylinder 700 and a gap between the third piston 500 and the third cylinder 700 becomes small. However, since the slider rolling body 800 rotating between the third slider 600 and the third cylinder 700 is provided, a gap between the third slider 600 and the third cylinder 700 is made appropriate, a gap between the third piston 500 integrally coupled with the third slider 600 and the third cylinder 700 is made appropriate, and so-called misalignment is solved and thus friction between the third piston 500 and the third cylinder 700 is reduced and wear of the third cylinder 700 is reduced as described above. Note that, the blowback operation is as described above. In addition, the other gas type mock gun 101 is different from the gas type mock gun 100 in a point that the other gas type mock gun 101 includes the friction reducing device 10C according to the third example instead of the friction reducing device 10A according to the first example.
Furthermore, regarding the friction reducing device 10C, the third piston 500 is disposed in the third cylinder 700 such that the third piston 500 is moved backward (moved rightward in Fig. 8A) by means of the pressure of the compressed gas as described later. In addition, the third piston 500 includes a third piston main body 501, elastic ring-shaped third piston packing 502 that is disposed at a tip end of the third piston main body 501, and a third screw portion 503 that fixes the third piston packing 502 to the third piston main body 501. Airtightness with respect to the third cylinder 700 is secured by means of the third piston packing 502. Furthermore, a slider rolling body holding portion 804 that rotatably holds the slider rolling body 800 is provided (refer to Fig. 8B).
The inside of the third cylinder 700 is tubular. In addition, when gas discharged into the flow path 123 which will be described later flows into the third cylinder 700, the third piston 500 accommodated therein is moved in a backward direction.
The third slider 600 is integrally coupled to the third piston 500 at a rear portion thereof and the third slider 600 also moves in a direction to the rear portion when the third piston 500 moves in the direction to the rear portion. In addition, as described above, the third slider 600 and the third piston 500 are integrally coupled with each other at rear portions thereof and the third cylinder 700 is interposed between the third slider 600 and the third piston 500 at front portions thereof.
The slider rolling body 800 rotates in accordance with movement of the third piston 500 as described above and includes a rotatable slider axle portion 801 that is disposed in a horizontal direction and slider wheel portions 802 and 802 disposed at opposite ends thereof as in the case of wheels of a train and the slider rolling body 800 is rotatably fixed to the third slider 600 by the slider rolling body holding portion 804. In addition, slider wheel surfaces 803 and 803 of the slider wheel portions 802 and 802 that are in contact with the third cylinder 700 have curved shapes. Therefore, the slider wheel surfaces 803 and 803 of the slider wheel portions 802 and 802 are in contact with an outer circumferential surface of the third cylinder 700 at the surfaces thereof (refer to Figs. 8A and 8B).
Here, the operation of the other gas type mock gun 101 and the operation of the friction reducing device 10C in the third example will be described together. Note that, the description will be made with the same parts as those of the above-described gas type mock gun 100 given the same reference numerals. A so-called cocking operation is performed in a state as shown in Fig. 8A and Fig. 8B such that the bullet B to be fired first is engaged with the engagement portion 127.
Next, when the trigger 120 is pulled, the closed first on-off valve 122 is moved by a member (not shown) and thus liquefied gas with which the tank 121 is filled in advance is vaporized and gas thereof is discharged to the flow path 123 from the first on-off valve 122.
The spring 124 urges the second on-off valve 125 in a direction opposite to the muzzle 110 (rightward direction in Fig. 9A). That is, the second on-off valve 125 is urged such that the second on-off valve 125 is made open. In this state, the gas discharged to the flow path 123 passes through the second on-off valve 125 in an opened state, passes through the nozzle 126, and is injected toward the bullet B engaged with the engagement portion 127. Note that, the engagement portion 127 has elasticity.
The bullet B toward which the gas is injected rapidly moves inside the barrel 128 that has a tubular structure and is for firing the bullet B. Note that, at that time, the third piston 500 is disposed in the third cylinder 700 and the third piston 500 is disposed on a left side in the drawing (refer to Figs. 9A and 9B), inside the third cylinder 700.
The bullet B toward which the gas is injected passes through the barrel 128 that has a tubular structure and is for firing the bullet B and the bullet B is fired through the muzzle 110. Note that, at a time point when the gas discharged to the flow path 123 passes through the second on-off valve 125 in the opened state as described above, the second on-off valve 125 rides on a gas stream and moves in a direction toward the muzzle 110 against an urging force of the spring 124. Since adjustment is performed such that the second on-off valve 125 is closed at a timing at which the bullet B is separated from the muzzle 110, the second on-off valve 125 is closed when the bullet B is fired through the muzzle 110. Therefore, the second on-off valve 125 is closed and thus no gas flows into the barrel 128 and gas flows into the third cylinder 700 at this time.
When the gas flows into the third cylinder 700, the third piston 500 moves rightward in the drawing (refer to Figs. 10A and 10B). Due to the movement of the third piston 500, the slider rolling body 800 rotates.
Furthermore, when the gas flows into the third cylinder 700, the third piston 500 moves rightward in the drawing (refer to Figs. 11A and 11B). Due to the movement of the third piston 500, the slider rolling body 800 disposed on the third slider 600 further rotates. When being withdrawn maximally, the third piston 500 is moved backward further than a third rear end opening 701 of the third cylinder 700. Note that, since the third piston 500 and the third slider 600 are integrally coupled with each other at rear portions thereof as described above, the third slider 600 is also moved backward as with the third piston 500. In addition, at the same time, the gun main body 150 integrally coupled with the third slider 600 moves backward and thus the main body spring 151 is compressed. In addition, the nozzle 126 integrally coupled with the third slider 600 also moves backward.
At that time, the bullet opening portion 140 is opened and the bullet B1, which is positioned uppermost from among the plurality of bullets B urged to be raised by the bullet spring 141, is to be fired next, and is the next bullet, is further raised.
As the compressed main body spring 151 restores the natural length thereof, the third slider 600 moves in a direction to the muzzle 110, the slider rolling body 800 disposed on the third slider 600 rotates reversely, and the third piston 500 moves leftward in the drawing (refer to Figs. 12A and 12B). At that time, the bullet B1 which is positioned uppermost from among the plurality of bullets B is moved by the nozzle 126 due to movement of the nozzle 126 in the direction to the muzzle 110 and the bullet B1 is engaged with the engagement portion 127. In this manner, the bullet B1, which is the next bullet, is loaded through a so-called blowback operation. The above-described operation is repeated in this manner each time the bullet B is fired.
Here, the above-described operation is repeated each time the bullet B is fired and the operation is momentary. Therefore, friction between the third piston 500 and the third slider 600, which occurs in the case of the related art, can be reduced as much as possible with rotation of the slider rolling body 800 and wear caused by the friction can be prevented. Note that, it is also a matter of course that a gap between the third slider 600 and the third cylinder 700 is made appropriate, a gap between the third piston 500 integrally coupled with the third slider 600 and the third cylinder 700 is made appropriate, and so-called misalignment is prevented since the slider rolling body 800 is provided as described above.
Next, a friction reducing device 10D in a fourth example will be described. Note that, the configuration of the other gas type mock gun 101 is the same as the configuration described above except for the friction reducing device 10C in the third example and thus the description thereof will be omitted. The friction reducing device 10D in the fourth example and the friction reducing device 10C in the third example are different from each other in a point that the slider rolling body 800 and a second slider rolling body 900 are different in configuration. Therefore, those are the same as each other in a point that the second slider rolling body 900 rotating between the third slider 600, which is integrally coupled with the third piston 500 at the rear portion thereof, and the third cylinder 700 for a blowback operation is disposed to reduce friction between the third slider 600 and the third cylinder 700.
The second slider rolling body 900 rotates in accordance with movement of the third slider 600 as described above and includes a substantially circular second slider wheel portion 920 that is disposed on a second slider axle portion 910 and rotates together with the second slider axle portion 910 as in the case of a wheel of a monocycle, the second slider axle portion 910 being disposed in a horizontal direction and serving as a shaft. The second slider axle portion 910 that serves as a shaft and the second slider wheel portion 920 may not rotate together and may rotate independently of each other. In addition, the second slider axle portion 910 that serves as a shaft is disposed at the center of the substantially circular second slider wheel portion 920 and a second slider rolling body holding portion 940 is disposed such that the second slider wheel portion 920 can rotate with respect to the second slider axle portion 910 disposed in the horizontal direction, as shown in Fig. 13B.
The second slider rolling body 900 is rotatably fixed to the third slider 600 by the second slider rolling body holding portion 940. In addition, a second slider wheel surface 930, which is a surface of the second slider wheel portion 920 and is in contact with the third cylinder 700, has a curved shape (refer to Fig. 13B).
The third piston 500 is disposed in the third cylinder 700 such that the third piston 500 can be moved backward (rightward in Fig. 13A) by means of the pressure of the compressed gas. In addition, the third cylinder 700 is the same as the cylinder 30 in the friction reducing device 10A. However, it will be described just in case that the third cylinder 700 is tubular and the third piston 500 is moved in a backward direction when gas discharged into the flow path 123 which will be described later flows into the second cylinder 300.
Regarding the friction reducing device 10D configured as described above, the above-described operation is repeated each time the bullet B is fired and the operation is momentary. Therefore, friction between the third piston 500 and the third slider 600, which occurs in the case of the related art, can be reduced as much as possible with rotation of the second slider rolling body 900 and wear caused by the friction can be prevented. It is also a matter of course that the positions of the third slider 600 and the third cylinder 700 are made appropriate and a gap between the third piston 500 integrally coupled with the third slider 600 and the third cylinder 700 is made appropriate such that so-called misalignment is prevented since the second slider rolling body 900 is provided as described above.
In addition, the gas type mock gun 100 may include a ny of the friction reducing device 10A in the first exampl e and the friction reducing device 10B in the second examp le. In addition, the gas type mock gun 101 may include an y of the friction reducing device 10C in the third example and the friction reducing device 10D in the fourth exampl e. Furthermore, any of the friction reducing device 10A i n the first example and the friction reducing device 10B i n the second example and any of the friction reducing devi ce 10C in the third example and the friction reducing devi ce 10D in the fourth example may be disposed in a gas type mock gun at the same time (not shown).

Explanation of Reference

10A: friction reducing device in first example
10B: friction reducing device in second example
10C: friction reducing device in third example
10D: friction reducing device in fourth example
20: piston
30: cylinder
40: piston rolling body
41: axle portion
42: wheel portion
100: gas type mock gun
101: another gas type mock gun
200: second piston
300: second cylinder
400: second piston rolling body
410: second axle portion
420: second wheel portion
500: third piston
600: third slider
700: third cylinder
800: slider rolling body
801: slider axle portion
802: slider wheel portion
900: second slider rolling body
910: second slider axle portion
920: second slider wheel portion

Claims

A friction reducing device for reduction of friction between a piston and a cylinder comprising:
a piston into which gas flows and that moves backward so that a next bullet is loaded;

a cylinder that accommodates the piston with the piston made movable; and

a piston rolling body that is rotatably disposed at the piston,

wherein, when the piston moves backward, the piston rolling body that is rotatably disposed at the piston comes into contact with an internal portion of the cylinder and the piston rolling body rotates.
The friction reducing device for reduction of friction between a piston and a cylinder according to claim 1,
wherein the piston rolling body includes an axle portion that is rotatable and disposed in a horizontal direction and wheel portions that are disposed at opposite ends of the axle portion.
The friction reducing device for reduction of friction between a piston and a cylinder according to claim 1,
wherein the piston rolling body includes a second axle portion that is disposed in a horizontal direction and serves as a shaft and a second wheel portion that is disposed on the second axle portion, and
wherein the second axle portion that serves as the shaft is disposed at a center of the second wheel portion.
A friction reducing device for reduction of friction between a piston integrally coupled with a slider and a cylinder comprising:
a piston into which gas flows and that moves backward so that a next bullet is loaded;

a slider that is integrally coupled with the piston;

a cylinder that accommodates the piston with the piston made movable; and

a slider rolling body that is rotatably disposed at the slider,

wherein, when the piston moves backward and the slider integrally coupled with the piston moves backward, the slider rolling body that is rotatably disposed at the slider comes into contact with an external portion of the cylinder and the slider rolling body rotates.
The friction reducing device for reduction of friction between a piston and a cylinder according to claim 4,
wherein the slider rolling body includes a slider axle portion that is rotatable and disposed in a horizontal direction and slider wheel portions that are disposed at opposite ends of the slider axle portion.
The friction reducing device for reduction of friction between a piston and a cylinder according to claim 4,
wherein the slider rolling body includes a second slider axle portion that is disposed in a horizontal direction and serves as a shaft and a second slider wheel portion that is disposed on the second slider axle portion, and
wherein the second slider axle portion that serves as the shaft is disposed at a center of the second slider wheel portion.
A blowback gas type mock gun comprising:
the friction reducing device for reduction of friction between a piston and a cylinder according to any one of claims 1 to 3.
A blowback gas type mock gun comprising:
the friction reducing device for reduction of friction between a piston and a cylinder according to any one of claims 4 to 6.
A blowback gas type mock gun comprising:
the friction reducing device for reduction of friction between a piston and a cylinder according to any one of claims 1 to 3; and

the friction reducing device for reduction of fricti on between a piston and a cylinder according to any one of claims 4 to 6.