Bolt stop shock-absorption device in a gun

A gun includes a bolt, a bolt stop member and a shock-absorption device. The bolt is movable forward or backward in a gun body, accumulates a pressure of a buffer spring while moving backward according to manipulation of the gun, and moves forward by releasing the accumulated pressure. The bolt stop member stops the bolt moving forward. The shock-absorption device includes a shock-absorption link which engages with a shock-absorption shaft which acts on the bolt stop member to absorb an impact force applied to the bolt stop member by the engagement of the bolt and the bolt stop portion.

BACKGROUND OF THE INVENTION

The present invention relates to a bolt stop shock-absorption device including a bolt which is provided to be movable forward or backward in a gun body, accumulates a pressure of a buffer spring according to manipulation of a gun, and moves forward by releasing the accumulated pressure, and a bolt stop which stops the bolt while the bolt moves forward.

BACKGROUND ART

A bolt stop mechanism is used in a gun having a bolt which accumulates a pressure of a buffer spring according to manipulation of a gun and moves forward by releasing the accumulated pressure. For example, a simulation gun corresponds to a gas blowback type gun, and a gun which fires a live bullet (hereinafter, referred to as a real gun) corresponds to an automatic loading type gun. In this type of gun, in order to load a bullet by moving a bolt forward, the bolt collides with a bolt stop and is stopped. The collision and the stop are repeated each time the bullet is shot out.

Accordingly, whenever the bolt collides with the bolt stop, large impact is applied to the bolt stop, metal fatigue is easily generated, and in the worst case, the bolt stop may be damaged. Even when impossibility of firing is not immediately generated by the damage of the bolt stop, the damage of the bolt stop becomes a matter of concern. This problem is generated in not only the real gun but also a simulation gun which is designed to simulate the real gun. However, at the present time, a remedy for this problem cannot be ascertained.

Examining the prior art, for example, an invention disclosed in PTL 1 includes a locking member, a forward/backward movement bolt, a front abutment portion, and a movable lever member, in which the locking member selects a first position and a second position depending on whether a trigger is pulled or not, and the forward/backward movement bolt is in a state where a supply of a bullet into a bullet chamber and firing of the bullet are performed by a gas pressure when the forward/backward movement bolt moves forward along a barrel, is in a preparation state for supplying the bullet into the bullet chamber when the gas pressure is supplied and the forward/backward movement bolt moves backward along the barrel, and moves forward when the gas pressure is released. In addition, the front abutment portion provided in the forward/backward movement bolt abuts on the locking member positioned at the first position by the forward movement and maintains the forward/backward movement bolt at a standby position. Moreover, the movable lever member has a protrusion, is disposed to be movable in the forward/backward movement bolt, abuts on a locking member in which the protrusion is positioned at the first position at a position at which the movable lever member moves backward with respect to the forward/backward movement bolt, and maintains the forward/backward movement bolt at an intermediate stop position.

In a toy gun of the above-described invention, the forward movement of the bolt is prevented by the bolt abutting on a bolt stop referred to as the locking member. However, the locking member is rotatably pivoted to the gun body by a shaft. Accordingly, impact when the bolt moving forward abuts on the locking member is directly applied to the locking member and a mass of the bolt is relatively large. Therefore, if the impact is repeatedly applied to the bolt stop, the bolt stop does not endure the impact, and thus, similarly to the bolt stop in the related art, there is a concern that the bolt stop may be damaged.

PATENT LITERATURE

Japanese Unexamined Patent Application Publication No. H10-197200

BRIEF SUMMARY OF THE INVENTION

Technical Problem

The present invention is made in consideration of the above-described problems, and an object thereof is to provide a bolt stop shock-absorption device in a gun which is not easily damaged and has high durability by absorbing impact of a bolt even when impact is repeatedly applied to a bolt stop member. In addition, another object of the present invention is to absorb impact generated by a forward movement of the bolt without manipulating a loading lever (charging handle) again by releasing an engagement between the bolt stop member and the bolt when shooting completion of a bullet is detected and a magazine is replaced to reload the bullet.

Solution to Problem

In order to achieve the above-described objects, according to an aspect of the present invention, there is provided a bolt stop shock-absorption device in a gun including: a bolt which is provided to be movable forward or backward in a gun body, accumulates a pressure of a buffer spring while moving backward according to manipulation of the gun, and moves forward by releasing the accumulated pressure force, and a bolt stop member which stops the bolt moving forward, in which the bolt stop member includes engagement means which engages with the bolt moving forward and shock-absorption means which acts on the bolt stop member to absorb an impact force applied to the bolt stop member by the engagement means.

The gun to which the bolt stop device according to the present invention is applied is assumed to be a so-called simulation gun represented by a gas gun or the like as a main target. However, a simulation gun using compressed gas and real gun using gas generated by burning gunpowder are not different from the simulation gun represented by the gag gun in that they have a bolt that blocks gas, and thus, a real gun can also be the object of the present invention. In addition, in this type of gun, there are a so-called single shoot type gun and a continuous and single shoot switching type gun. This embodiment is directed to the continuous and single shoot switching type gun, but the present invention can be also applied to the single shoot type gun.

In addition, the bolt stop member includes the engagement means which engages with the bolt moving forward and the shock-absorption means which directly or indirectly acts on the bolt stop member to absorb an impact force applied to the bolt stop member by the engagement means. This configuration has the purpose that the present invention is established as long as there is the bolt stop member and the shock-absorption means acting on the bolt stop member as a minimum constituent requirement, and it is needless to say that requirements other than these can be added to the present invention.

For example, in the present invention, preferably, the gun body includes means for detecting running out of bullets by which presence or absence of a bullet supplied to a bullet portion according to the manipulation of the gun is detected, and the means for detecting running out of bullets includes a link mechanism which causes the bolt stop member configuring the bolt stop portion to protrude into a trajectory along which the bolt moves forward or backward to be able to perform an engagement of engagement means according to the detection of the running out of bullets. That is, in the case of the continuous and single shoot switching type gun, if a gun is used for continuous shooting, the reduction of bullets is quicker, the exchange of magazines becomes more frequent, and the use frequency of bolt stop increases. Accordingly, the shock absorption according to the present invention is exerted more effectively.

In addition, preferably, the bolt stop member configuring a bolt stop member includes a long hole in a front-rear direction in which a shaft provided on the gun body side is disposed, is movable within a range of the long hole, and is rotatably provided about the shaft, and the engagement means includes an engagement portion provided in the bolt and an engagement partner portion provided in the bolt stop member and is provided to form an acute angle in a forward movement direction of the bolt. The engagement is reliably performed, and thus, an intended purposed can be sufficiently achieved.

Advantageous Effects of Invention

The present invention is configured and is operated as described above, and thus, it is possible to provide the bolt stop shock-absorption device in a gun which can absorb and attenuate impact of the bolt using the shock-absorption means and is not easily damaged and has high durability even when impact is repeatedly applied to the bolt stop member. In addition, according to the present invention, it is possible to absorb impact generated by a forward movement of the bolt without manipulating a loading lever (charginghandle) again by releasing the engagement between the bolt stop member and the bolt when shooting completion of a bullet is detected and a magazine is replaced to reload the bullet.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, the present invention will be described in detail with reference to an embodiment shown. A bolt stop shock-absorption device in a gun of the present invention is applied to all simulation guns and is not limited to a gas gun. However, for convenience, first, an outline of the gas gun will be described.

A gun exemplified as a simulation gun G inFIG. 1is a blowback type gas gun. In the shown simulation gun G, a firing set portion10is provided in a center portion of a gun body, a barrel portion11is provided in front of the gun body10, a magazine portion22is provided below the gun body, and a movable body portion30for a blowback bolt29is provided behind the gun body.

A bullet portion12is provided at the rear portion of the barrel portion11, gas is ejected to a bullet B loaded on the bullet portion12via a differential pressure valve mechanism20provided in the firing set portion10, and as a result, the bullet B is fired. A piston mechanism portion15is provided in the firing set portion10, and the piston mechanism portion15includes a piston13which is movably disposed in a barrel axial direction and a cylinder14which functions as a movement space of the piston13. The piston13is formed in a hollow cylindrical shape which includes a nozzle portion16ejecting the gas to the bullet B on a tip of the piston13and an opening, which is open to a closed end of the cylinder14, on a rear end of the piston13.

In the piston13, a gas inlet17communicating with the inside and outside is open to a lower portion close to the front end, and the differential pressure valve mechanism20is provided in the vicinity of the gas inlet17. The differential pressure valve mechanism20includes a differential pressure valve18which is disposed between the nozzle portion16positioned on the tip and the differential pressure valve mechanism20, a valve chamber19in which the differential pressure valve18can move forward or backward, and a return spring21which is disposed in the valve chamber. An outer diameter of the differential pressure valve18is set so as to have a dimensional difference of a degree of sliding fit with respect to an inner diameter of the valve chamber19.

Moreover, the differential pressure valve18is formed of a tubular valve in which a front end side thereof is open and a rear end side thereof is closed, and a gas passage hole18ais provided on a peripheral surface of the differential pressure valve18. Accordingly, the differential pressure valve18fires the bullet B which is moved backward by the return spring21and positioned at the bullet portion12, moves forward by the pressure of the gas continuously flowing in the differential pressure valve18thereafter to close a valve, and introduces the gas flow to the cylinder14. In this way, since an operation direction of the valve body is changed by the pressure difference, the differential pressure valve18is referred to as a differential pressure valve. The gas flow is introduced to the cylinder14and is used for a blowback operation.

The gas fills a gas tank23inside the magazine portion22, and the gas is supplied from the gas tank23to the piston mechanism portion15via an on-off valve mechanism25according to a manipulation of a trigger described later. The on-off valve mechanism25includes a gas flow path24from the gas tank23to the piston mechanism portion15and an on-off valve26which is provided to open and close the gas flow path24, and causes the gas to flow from an outlet27on the gas flow path end to an inlet17. In addition, the on-off valve26includes a valve shaft26aexposed to the outside to be press-beaten by a hammer40described later which is operated by the manipulation of the trigger.

In the piston mechanism portion15, the piston13is urged by a return spring28configured of a tension spring. A front end portion of the piston return spring28is a piston side member59aand a rear end portion thereof is attached to a cylinder side member59b. The bolt29has a necessary mass for experiencing a simulated recoil shock, and in this embodiment, the bolt29is formed in a shaft shape which is elongated in a front-rear direction. In addition, the cylinder14is provided to be integrated with the bolt29, and thus, a mass of the cylinder14is applied to the bolt29.

The movable body portion30is disposed behind the bolt29, and the movable body portion30includes a casing30cwhich is attached to the gun body and a movable shaft30awhich is disposed inside the casing30c. The movable shaft30ais provided to be movable forward or backward inside the casing30cis configured such that a rear end of the bolt29engages with a shaft head30b. In the drawings, a reference numeral31indicates a buffer spring, the buffer spring31urges the movable shaft30ain a forward movement direction, and thus, finally, the buffer spring31is operated to position the piston mechanism portion15in a firing preparation state. In addition, the buffer spring31receives the bolt29when the bolt29moves backward and also functions as means for adjusting the impact at the end of the recoil shock.

In order to operate the firing set portion10, a trigger32is provided. The trigger32is configured by combining two members32A and32B, the trigger member32A is a manipulating portion, and the trigger member32B is a manipulated member. The two members32A and32B are rotatable about a shaft33and are urged in a direction away from each other by a trigger spring34. A reference numeral35indicates a disconnector, and the disconnector35is coaxially provided with the trigger member32A to select a continuous shoot or a single shoot and is controlled by a selector36.

The trigger member32A locks the above-described hammer40in a cocking state. A reference numeral37indicates a trigger side locking portion which maintains the cocking state and a reference numeral38is a hammer side locking portion which maintains the locking state. A reference numeral39indicates a hammer spring and becomes in an accumulated pressure state at the time of cocking. Accordingly, if the trigger32A is manipulated, an engagement between the locking portions37and38is released, and thus, the accumulated pressure of the hammer spring39is also released, and the hammer40is operated.

The hammer40is placed in an engagement state between a shear41and the hammer40at the time of the cocking. A spring42acts on the shear41, and the shear41acts in a direction in which the cocking of the hammer40is maintained. The hammer40is cocked by a backward movement of the cylinder14. Accordingly, a cam-shaped engagement protrusion43is provided on a lower portion of a rear end of the cylinder14, and the engagement protrusion44is pivoted by the hammer40. A reference numeral45indicates a press-beating portion of the hammer40and the press-beating portion45drives a valve shaft26avia a knocker46. A reference numeral47indicates a bolt protrusion and the bolt protrusion47rotates the shear41against the shear spring42and causes the hammer40which is in the cocking state to be rotatable. A reference numeral48is a loading lever (charging handle), the cylinder14is moved backward by manipulation of the loading lever48which engages with the front side of the cylinder14, and thus, the hammer40can be cocked. The protrusions44and47may be simple protrusions or may be rolls.

The embodiment of the bolt stop shock-absorption device in the gun according to the present invention is shown in detail inFIG. 2. In the gas gun of this embodiment, a main portion of the shock-absorption device is positioned on the right side of the gun body, and thus, for convenience, inFIGS. 2 and 4 to 6, the gun body is also shown at the right, contrary toFIG. 1or the like.

The bolt stop shock-absorption device of the embodiment includes the bolt29which accumulates a pressure according to manipulation of the gun and moves forward by releasing of the buffer spring31and a bolt stop member62which stops the bolt29moving forward. Particularly, the present embodiment includes a configuration which protrudes the bolt stop member62in a trajectory X along which the bolt29moves forward or backward by an operation of means51for detecting running out of bullets, and impact generated when the bolt29moving forward and the bolt stop member62collide with each other is absorbed by shock-absorption means70.

In order to detect that the final bullet B loaded in the magazine portion22is fired, a follower53is provided. If a follower spring57which is provided in the magazine portion22and compressed by the bullet is extended by a repulsive force, the follower53is lifted according to the extension of the follower spring57. The follower53includes a follower lever53a, and the lever53aengages with one end portion54aof a follower link54to configure a front end portion of the means51for detecting running out of bullets. The means51for detecting running out of bullets shown in the embodiment further includes the follower link54which is oscillatingly pivoted by a shaft portion54band an intermediate link55.

The other end portion54cof the follower link54engages with one end portion55aof the intermediate link55, and the follower link54and the intermediate link55are oscillatingly pivoted by shaft portions54band55b, respectively. The other end portion55cof the intermediate link55engages with one end portion61aof a relay member61between the bolt stop portion60and the intermediate link55and causes the bolt stop portion60to protrude into the trajectory X along which the bolt29moves forward or backward. The follower link54and the intermediate link55configures a link mechanism56which causes the means51for detecting running out of bullets and the bolt stop portion60to communicate with each other.

The relay member61, the bolt stop member62, or the like configure the bolt stop portion60. One end portion61aof the relay member61engages with the other end portion55cof the intermediate link55, and the other end portion61bof the relay member61engages with a groove portion62aof the bolt stop member62. Accordingly, if the means51for detecting running out of bullets detects running out of bullets, information of running out of bullets that the bullets B disposed in the bullet portion12have been shot out is sequentially transmitted to the bolt stop portion60by the link mechanism56.

Referring toFIG. 3, the relay member61is shown as a member extending to the right and left of the gun body and is pivoted to the gun body side by a left shaft61c. The relay member61is provided such that a portion on a right portion (shown as a crank shape inFIG. 2) is able to move up and down by a rotation of the relay member61around an axis. In addition, the relay member61includes a manipulating portion61dwhich is positioned above the shaft61cand is shown on the left side of the gun body. A spring61eacts on the upper portion of the manipulating portion61d, and thus, the manipulating portion61dis provided to return the relay member61to a home position and to press the bolt stop member62described later.

A long hole62bin a front-rear direction is formed in the bolt stop member62, and the bolt stop member62is oscillatingly pivoted to the gun body side by a shaft65. Accordingly, the bolt stop member62is movable by a stroke amount in a long hole62band is rotatable about the shaft65. As a result of this configuration, the side of an engagement partner62cof the bolt stop member62is lifted via the relay member61by the link mechanism56, and the bolt29can protrude into the trajectory X in which the bolt29moves forward or backward.

An engagement portion29awhich engages with one side of the engagement means59is provided in the bolt29, and the engagement portion29ais provided to be able to engage with the engagement partner62cwhich is provided in the bolt stop member62as the other side of the engagement means59. Particularly, in the embodiment, the engagement portion29aand the engagement partner62care provided as inclination portions which form an acute angle in the forward movement direction of the bolt29. Since the bolt stop member62is pivoted by the shaft65in the long hole62bin the front-rear direction, the inclinations of the engagement portion29aand the engagement partner62celiminate instability of the engagement generated in a case where the engagement portion29aand the engagement partner62care formed at right angles, and thus, improve reliability of the engagement.

The shock-absorption means70acts on the bolt stop portion60. In the embodiment, the shock-absorption means70includes a shock-absorption link67, and a shock-absorption shaft68and a shock-absorption spring69which are movably incorporated into an attachment portion66on the gun body side in the front-rear direction. The shock-absorption link67is oscillatingly pivoted to the gun body side by the shaft67b, one end of the shock-absorption link67engages with a front engagement portion62dof the bolt stop member62and the other end thereof engages with the tip of the shock-absorption shaft68. Accordingly, when the bolt29collides with the bolt stop member62according to the forward movement of the bolt29, impact generated when the bolt stop member62moves in a direction of a muzzle is transmitted to the shock-absorption means70.

Since the relay member61and the bolt stop member62are lined up in a direction of a gun base from the muzzle, the bolt29collides with the bolt stop member62in the bolt stop portion60when the bolt29moves forward. However, the relay member61has a shape which does not come into contact with the bolt29and has a shape which does not come into contact with the bolt29even when the bolt stop member62moves at maximum, and thus, the bolt29does not come into direct contact with the relay member61. The bolt stop member62engages with the shaft65in the long hole62b, and thus, the bolt stop member62can move with a length of the long hole62bas a maximum limit. When the bolt stop member62move at maximum, the other end portion61bof the relay member61further enters the groove portion62aof the bolt stop member62.

In the bolt stop shock-absorption device of the gun of the present invention configured as described above, if the bullet B is fired and the bullet B does not exist in the magazine portion22in a state where the final bullet B is positioned in the bullet portion12(FIG. 4A), the bolt29starts to move backward, the follower53is lifted to the highest position around the rear side of the bullet portion12by the repulsive force of the follower spring57, and the one end portion54aof the follower link54engaging with the follower lever53ais pushed up (FIG. 4B). The operation accompanying this pushing up is transmitted from the follower link54to the bolt stop member62via the intermediate link55and the relay member61.

If the bolt29moves backward farthest (FIG. 5A), the follower53is lifted to the highest position to complete the lifting, and the operation of the bolt stop member62is completed by the transmission operation of the link mechanism56. As a result, the bolt stop member62rotates about the shaft65, the tip side of the bolt stop member62is pushed up by the relay member61, and the engagement partner62cconfiguring the inclination portion protrudes into the trajectory X along which the bolt29moves forward or backward. The bolt29receive the repulsive force of the buffer spring31which accumulates a pressure according to the backward movement of the bolt29and moves forward, and thus, the engagement portion29aand the engagement partner62cengage with each other at the inclination portions (FIG. 5B).

If the bolt29further moves forward, the bolt stop member62is entrained forward by the engagement means59and the shaft65moves toward the rear end of the long hole62bfrom the front end of the disposed long hole62b(FIG. 6A). While the bolt stop member62moves as described above, the shock-absorption link67with which the front engagement portion62dengages is pressed by one end portion67a, and the shock-absorption shaft68engaging with the other end67cis pressed. Accordingly, when the bolt29collides with the bolt stop member62according to the forward movement of the bolt29, impact generated when the bolt stop member62moves in the direction of the muzzle is absorbed by the shock-absorption means70, and thus, the bolt29gently stops. Next, the bolt stop member62is pushed backward by the elastic force of the shock-absorption spring69, and the bolt29moves backward to the position shownFIG. 5B, and the operation of the shock-absorption device is completed.

An overall operation of the simulation gun G in the present invention will be described as follows. The bolt29is moved backward by manually manipulating the loading lever48, and the hammer40become in a cocking state (state ofFIG. 7A). If the loading lever48is released, the bolt29is moved forward by the buffer spring31, one bullet B is loaded into bullet portion12by nozzle portion16of the piston mechanism portion15which integrally moves with the bolt29(FIG. 7B).

Subsequently, if trigger32A is pulled and hammer40is operated, the valve shaft26ais pushed via knocker46, the on-off valve mechanism25is open, and compressed gas flows into gas inlet17. The compressed gas flows into the differential pressure valve18from the gas communication port18aof the differential pressure valve mechanism20and is ejected to bullet B, and as a result, the bullet B is fired from the barrel11(FIG. 8A). The differential pressure valve18is moved forward by the pressure of the gas which continuously flows in even after the bullet is fired, the differential pressure valve mechanism20is closed, and the gas flow is introduced to the cylinder14(FIG. 8B).

As the gas flows into the cylinder14, the piston mechanism portion15is moved backward along with the bolt29, and in the process, the hammer40is cocked (FIG. 9A). If the bolt29is moved backward to a certain extent, the piston13starts to move backward along with the piston stop50and is drawn in a bolt direction by the piston return spring28(FIG. 9B).

The bolt29stops after moving backward to a position moved backward farthest along with the piston mechanism portion15(FIG. 10A), and a manipulator of the simulation gun G experiences a shock accompanying the movement of the mass of the bolt29during this time. The buffer spring31in which the pressure is accumulated by the backward movement is released, the bolt29is switched to move forward, and one bullet B is loaded in the bullet portion12by the nozzle portion16positioned at the tip of the piston mechanism which integrally moves with the bolt29(FIG. 10B). In addition, the protrusion47of the bolt29rotates the shear41, and thus, the hammer40is released, the state is returned to the state ofFIG. 7B, and the fire operation is repeated (fire mode). In a case of a single shoot mode, the hammer40engages with the disconnector35and the engagement portion35aand40aand is stopped. Since the locking is released by returning the trigger32, the hammer40is locked to the trigger32and is held in the cocking state.

In the bolt stop shock-absorption device in the gun of the present invention, the bolt stop member62stopping the bolt29is indirectly absorbed by the shock-absorption means70, damage of the bolt stop member62is prevented, and it is possible to prevent the gun from being not operated suddenly. In addition, in the device of the present invention, when the running out of the bullets B indicating the bullets B running out is detected and a magazine is replaced to reload the bullets, it is not necessary to manipulate the loading lever (charging handle) again by releasing the bolt stop member62.

REFERENCE NUMBERS

10: firing set portion

15: piston mechanism portion

18: differential pressure valve

20: differential pressure valve mechanism

21: return spring

22: magazine portion

23: gas tank

24: gas flow path

28: piston return spring

30: movable body portion

31: buffer spring

34: trigger spring

39: hammer spring

44: engagement ring

51: means for detecting running out of bullets

55: intermediate link

56: link mechanism

59: engagement means

60: bolt stop portion

61: relay member

62: bolt stop member

66: attachment portion