1. Field of the Invention
This invention relates to an air gun for carrying out firing and blowback with a compressed gas as an energy source, and has a structure for supplying energy for both firing of a bullet and carrying out blowback from a single compressed gas. In more detail, the invention relates to an air gun that performs firing of a bullet and blowback more efficiently than a conventional air gun for firing and carrying out blowback, and with which design of bullet firing and blowback adjustment can be made more simple.
2. Description of the Related Art
A mechanism of a conventional air gun, for firing a bullet using compressed gas and performing blowback, has a single air chamber, and a single valve is provided inside the air chamber. By distributing the gas inside the air chamber for firing use and blowback use, both firing and blowback are carried out by operating the single valve.
For example, as related art 1, U.S. patent application Ser. No. 11/024,479, applied by the present applicant (US application date: Dec. 20, 2004), discloses
“An air gun, comprising:
a slide, provided in an upper part of a gun and capable of sliding parallel to a barrel;
a cylinder section, formed of a cylinder that is open at a muzzle side and closed off at a gun rear end side, fixed inside a gun rear end side of the slide;
a hit pin provided projecting from a hollow inner portion of the cylinder section to a gun rear end side, and being capable of sliding in a nozzle direction;
a hollow valve pin chamber fixed to the gun body so as to be positioned inside the hollow inner portion of the cylinder section;
a valve body having a through hole passing through from a muzzle side to a gun rear end side at a smaller diameter than the valve pin chamber; a gas supply port, opened to a cylindrical peripheral surface of the valve pin chamber, for constantly supplying compressed gas to the valve pin chamber of the valve body;
a valve pin, formed as a cylinder and provided inside the valve pin chamber, constantly urged to the gun rear end side and having a bullet nozzle insertion section formed at a muzzle side and inserted into the muzzle side through holes of the valve pin chamber to project, and a pin body that has a valve pin flange section, capable of sliding in an air-tight state in the muzzle side through hole of the valve pin chamber and contacts a gun rear end side surface of the valve pin in an air-tight manner at the gun rear end side, the valve pin communicating with a muzzle side providing a valve pin chamber side opening that opens to a pin body side surface at a muzzle side of a pressing section provided in the pin body;
a pressing section, provided at a gun rear side of the pin body, fixed to the valve body, inserted into rear end side through holes of the valve pin to project to the gun rear side, positioned so that a tip end of a gun rear side is adjacent to the hit pin, and capable of venting compressed gas from a gap between the rear end side through holes;
a bullet feed nozzle link for linking to a trigger; and
a bullet feed nozzle, formed as a cylinder, inserted into a valve pin muzzle side bullet feed nozzle insertion section projecting to a muzzle side of the valve pin chamber, forming a rib-shaped bullet feed nozzle link engagement projection for engaging with the bullet feed nozzle link at an outer periphery of a gun rear end side, and being capable of sliding in the valve pin muzzle side bullet feed nozzle insertion section in order to load a bullet in the chamber in response to movement of the trigger and the bullet feed nozzle link, wherein
when the hit pin is pressed to the muzzle side and made to slide to the muzzle side, the valve pin slides to the muzzle side against urging force to release an airtight state between the valve pin flange section and a side surface at the gun rear end side of the valve pin chamber, compressed gas supplied to the valve pin chamber from the gas supply port is supplied from between the side surface at the gun rear end side of the valve pin chamber and the valve pin flange section to the valve pin chamber side opening, and a bullet is fired from the muzzle by the supply of compressed gas through the bullet feed nozzle insertion section to the muzzle side of the bullet feed nozzle, and
compressed gas is supplied from a gap between the pressing section and through holes into which the pressing section is inserted to the gun rear end side to cause the cylinder section to move to the gun rear end side.”.
Also, as another embodiment of the invention of related art 1, there is disclosed an air gun as described above in which the cylinder section is provided freely moving inside a gun rear side of the slide, and there is no hit pin.
However, with the mechanism of the air gun disclosed in related art 1, firing and blowback are carried out using discharge of a single valve provided in a single air chamber, and since compressed gas is distributed for firing use and blowback use these actions are carried out at substantially the same time. Therefore, even if it is attempted to independent and separately adjust the firing operation and the blowback operation, this type of independent adjustment is difficult.
Also, with a structure such as that of related art 1, the firing operation and the blowback operation can not be independently adjusted separately at the design stage. That is, since distribution of gas pressure of the compressed gas is difficult, adjustment of bullet speed and adjustment of blowback strength and period, etc. at the time of design is extremely difficult.
In order to solve the above-described problems, there is proposed an air gun, for firing a bullet using compressed gas, and having a mechanism for performing blowback, wherein the blowback mechanism is provided with a firing chamber and a blowback chamber, being two cavities capable of being supplied with compressed gas from a compressed gas source and being sealed to contain the compressed gas, inside a valve body, a firing valve inside the firing chamber, a blowback valve inside the blowback chamber, and two valves that are capable of actuation independent of each other by operation of a trigger.
There is also proposed an air gun, for firing a bullet using compressed gas, and having a mechanism for performing blowback, wherein the blowback mechanism is provided with a firing chamber and a blowback chamber, being two cavities capable of being sealed to contain the compressed gas, inside a valve body, a firing valve inside the firing chamber, a blowback valve inside the blowback chamber, and two valves that are capable of actuation independent of each, and the firing valve is opened by actuation of a barrel latch actuated by a trigger operation, and the blowback valve is opened by actuation of a hammer actuated by the trigger operation.
There is further proposed an air gun having either of the two blowback mechanisms described above, wherein the firing chamber and the blowback chamber, being two cavities, are connected by a narrow connection passage having a small volume compared to the volume of the respective cavities between two air chambers.
There is still further proposed an air gun having either of the two blowback mechanisms described above, wherein the firing chamber and the blowback chamber, being two cavities, are connected to mutually independent compressed gas air sources.
According to this invention, since the chamber for bullet firing and the chamber for blowback are provided independently of each other, and respective valves are provided in each air chamber, the valve for bullet firing is opened by means of actuation of a barrel latch due to actuation of the trigger, and the valve for blowback is opened by means of impact of a hammer due to actuation of the trigger. Therefore, the respective chambers and valves operate independently and are not constrained by each other. Accordingly, factors such as extent of respective valve open areas, shortening of open time, and ease of opening etc. can be arbitrarily adjusted at the time of design, and the degree of distributing gas pressure of the compressed gas is also simplified. Adjustment of bullet speed and adjustment of blowback therefore become possible with adjustment in the design. For example, by shortening the open time of the bullet firing valve and widening the open area, substantially independently of the opening of the blowback valve, it is possible to send more compressed gas to the inner barrel, and the rate of fire of the bullets can be increased.
Further, the timing for bullet firing and blowback are respectively adjustable, which means that causing a blowback operation to be carried out after firing a bullet can be reliably performed in design. In this way, design and development of an air gun with further improved accuracy of fire is made easy.
An air gun having the blowback mechanism of this invention will now be described based on
Next, the structure of an air gun having the blowback mechanism of the embodiment of the present invention will be described based on
The main structural components of the air gun of this invention are a gun body 1 having a frame 2 (grip section) at a rear part, an inner barrel 5, which is a ballistic path, an outer barrel 4 provided outside the inner barrel 5, a slide 3 capable of sliding parallel to the outer barrel 4, a cylinder 33 fixed to a gun rear end side inner section of the slide 3, a hit pin 32 provided projecting from a hollow inner part of the cylinder 33 to the gun rear side and slidable in the muzzle direction, a hammer 20 capable of pushing the hit pin as a result of operation of a trigger 14, a valve body 24 provided between a chamber 11 and the cylinder 33, a bullet firing air chamber 25a and a blowback air chamber 25b provided as two hollow sections inside the valve body 24, a bullet firing valve 26 provided in the bullet firing air chamber 25b, a blowback valve 29 provided in the blowback air chamber 25b, and a barrel latch 9 actuated by the trigger 14. Reference numeral 22 is a magazine, which can be attached and removed to and from the frame 2.
The slide 3 is capable of sliding along the outer barrel 4. This slide 3 is urged to the muzzle side by the tension of a recoil spring 13. The outer barrel 4 and the inner barrel 5 are both cylindrical. The inner barrel 5 is a ballistic path, and is provided at an inner part of the outer barrel 4.
A box-shaped barrel housing 8 having a hollow inner section is provided in the vicinity of a central section, in the longitudinal direction, of the inner barrel, as shown in
A barrel spring washer 7 is provided at a muzzle side of the barrel housing 8, and is provided in contact with a gun rear end surface of the barrel spring 6. The barrel spring 6 and the barrel spring washer 7 are provided capable of sliding between a muzzle side tip end of the inner barrel 6 and a muzzle side surface of the barrel housing 8. The barrel spring washer 7 has a lower part formed as a frame engagement section 7a, and rearward movement is stopped by the frame engagement section 7a coming into contact with a barrel spring washer retreat prevention section 2b provided on the frame 2.
The barrel latch 9 has a lower part urged to the muzzle side inside the barrel housing 8 by the barrel latch spring 10, and as a result a gun rear end side is urged downwards from the rotation shaft 9C. A barrel housing engagement section 9b formed at a gun rear end side of the barrel latch 9 is engaged by contact with a barrel latch engagement section 8a of the barrel housing 8. Also, a trigger contact section 9a formed on a gun rear end side of the barrel latch 9 and an upper tip section 14b of the trigger 14 have a function of engaging and disengaging with operation of the trigger 14.
The barrel body 24 is fixed to the frame 2, and is provided between the muzzle side chamber 11 and the gun rear side cylinder 33. A bullet firing air chamber 25a and a blowback air chamber 25b, that are two hollow sections capable of holding compresses gas in an air-tight manner, are provided inside the valve body 24. With this embodiment, the bullet firing air chamber and the blowback air chamber are separated by a separating wall 25c, and connected by a microscopic connecting passage 25d having a small area compared to the area of the respective hollow sections between the two air chambers. The bullet firing air chamber 25a is provided at a nozzle side, while the blowback air chamber 25b is provided at a gun rear side.
With the illustrated embodiment disclosed in claim 2, gas inside the gas canister A flows into the bullet firing air chamber 25a from a gas passage A1 in the lower part of the valve body 24 due to gas pressure inside the gas canister A, passes through the microscopic passage 25d provided in the separating wall 25c and also flows to the blowback air chamber 25b.
With another not-illustrated embodiment, it is also possible to have a structure where gas inside the gas canister A initially flows to the blowback air chamber 25b from a gas passage A1 in the lower part of the valve body 24 due to gas pressure inside the gas canister A, then passes through the microscopic passage 25d provided in the separating wall 25c and flows to the bullet firing air chamber 25a.
With an non-illustrated embodiment as disclosed in claim 3, the bullet firing chamber 25a and the blowback chamber 25b are constructed as independent hollow sections that are not connected to each other, and respectively have connecting passages A1 connecting to independent gas canisters A.
A through hole is formed in a muzzle side wall surface of the bullet firing air chamber 25a, and a bullet firing valve 26 is slidably provided in this through hole. The bullet firing valve 26 is a cylindrical shape with a gun rear end surface closed and a nozzle side end surface open, with the inside of the cylinder being provided as a gas passage 25d inside the bullet firing valve, and a firing valve opening section 26c provided at a gun rear side lower surface.
The bullet firing valve 26 is urged to the muzzle side by tension of a bullet firing valve spring 28 provided inside the bullet firing air chamber 25a, and is provided capable of sliding in the through hole. A bullet firing valve large diameter section 26b having a large cylindrical diameter is formed on the outer peripheral surface of the bullet firing valve 26 at a central section in the longitudinal direction. A muzzle side tip end of the bullet firing valve 26 is provided with a bullet firing valve small diameter section 26a having a cylindrical diameter that is smaller than the bullet firing valve large diameter section 26b. The bullet firing valve small diameter section 26a is capable of being fitted into a gun rear end side inner diameter of the inner barrel 5.
A gun rear end side of the bullet firing valve 26 is fitted into the bullet firing air chamber 25a, and a large diameter bullet firing valve flange section 26e is formed inside the bullet firing air chamber 25a. A bullet firing valve packing 27 is attached to a muzzle side wall surface of the bullet firing air chamber 25a.
The bullet firing air chamber 25a is urged to the muzzle side by tension of the bullet firing valve spring 28, with the bullet firing valve flange section 26e pressing the bullet firing valve packing 27 to the muzzle side to effect sealing, and at the same time, in this state, the bullet firing valve opening section 26c is sealed by the bullet firing valve packing 27. As a result, the bullet firing air chamber 25a is kept air-tight inside.
A through hole is formed in a gun rear end side wall surface of the blowback air chamber 25b, and a blowback valve 29 is slidably provided in this through hole. The blowback valve 29 is a cylindrical shape with a gun rear end surface open and a nozzle side end surface closed, with the inside of the cylinder being provided as a gas passage 29b inside the blowback valve, and a blowback valve opening section 29a is provided at a muzzle end side lower surface.
The blowback valve 29 has a muzzle end section fitted inside the blowback air chamber 25b, and a large diameter blowback valve flange section 29c is formed at an outer peripheral section of the blowback valve 29. The blowback valve 29 is urged to the gun rear end side by tension of the blowback valve spring 31 provided inside the blowback air chamber 25b.
A blowback valve packing 30 is attached to a gun rear end side wall surface of the blowback air chamber 25b. The blowback valve flange section 29c is pressed to the gun rear end side by the urging force of the blowback valve spring 31, and brought into close contact with the blowback valve packing 30, and at the same time, in this state the blowback valve opening section 29a is made airtight by the blowback valve packing 30. As a result, the blowback air chamber 25b is kept air-tight inside.
A rear end section of the blowback valve 29 is provided either separated from or in contact with a position where it can contact the hit pin 32.
The cylinder 33 is provided capable of sliding integrally with the slide 3. The cylinder 33 is cylindrical, with a rear side wall 330 provided at a gun rear end side, and an inner side wall of the cylinder 33 is constructed as a cylinder pressure surface 33a. A pin hole 331 is provided on the rear side wall 330, and a hit pin 32 is provided capable of sliding in the pin hole 331. A rear section of the valve body 24 is fitted inside the cylinder 33.
When the bullet firing valve 26 is slid to the gun rear end side against the urging of the bullet firing valve spring 28, the bullet firing valve opening section 26c formed in the bullet firing valve 26 is opened and it becomes possible for gas that has been filled into the bullet firing air chamber 25a from the gas canister A to flow from the opening section through the gas passage 26d inside the bullet firing valve to the inside of the inner barrel 5.
Also, when the blowback valve 29 is slid to the muzzle side against the urging of the blowback valve spring 31, the blowback valve opening section formed in the blowback valve 29 is opened, gas that has been filled into the blowback air chamber 25b flows from the opening section through the gas passage 29b inside the blowback valve 29 to the inner gap of the cylinder 33, and it becomes possible for the cylinder pressure surface 33a, which is a gun rear end side inner surface of the cylinder 33, to be pushed.
The hammer 20 is urged to the muzzle side by the hammer spring 21, and is positioned inside the gun body 1 so as to be capable of rotation about the hammer rotation shaft 20b as a rotational center. A shear locking section 20a is provided on the hammer 20, and it is possible to lock the hammer 20 in a state rotated to the gun rear end side.
A shear 18 is urged to the gun rear end side by the shear spring 19, and is provided inside the gun body 1 so as to be capable of rotation about a shear rotation shaft 18c as a rotational center. A hammer locking section 18a is provided for locking the hammer 20 in the rotated state when the hammer 20 is rotated to the gun rear end side. A trigger engagement lug section 18b capable of engaging with a shear engagement lug section 16c of the trigger 16 is provided on an upper end of the shear 18.
The trigger 14 is provided in the gun body 1 capable of rotation about the trigger shaft 14a as a center of rotation. The trigger shaft 16a is fitted into the trigger 14, and a trigger bar 16 is linked to the trigger 14. The trigger 14 is constructed so that an upper end thereof is urged to the gun rear end side by a trigger spring 15. The trigger bar 16 is positioned so that the rear is capable of rotation about the trigger bar shaft 16a as a center of rotation, and is urged upwards by a trigger bar spring 17.
A magazine 22 is case-shaped, and removably provided inside the frame 2. A plurality of bullets W are loaded inside the magazine 22. A magazine spring 23 is provided inside the magazine 22, and the bullets W are constantly urged upwards by this magazine spring 23. If the magazine 22 is fitted into the frame 2, a bullet W comes into contact with a rear end peripheral lower surface part of the inner barrel 5 and is locked. If the inner barrel 5 is moved to the muzzle side, the bullet W is moved upwards by the urging of the magazine spring 23 and placed inside the chamber 11.
The chamber 11 is cylindrical, positioned at the muzzle side of the valve body 24, and has a rear end surface that contacts the muzzle side surface of the valve body 24, with the inner barrel 5 and the bullet firing valve 26 respectively fitted inside the cylinder of the chamber 11 capable of sliding.
Next, operation of one cycle up to bullet firing of the air gun having the blow back mechanism that is one embodiment of the present invention will be described based on
If the slide 3 is manually slid further towards the gun rear end side, the hammer 20 again rotates further towards the gun rear end side. A slide backward movement prevention section 2a is provided in the frame 2. Movement of the slide 3 towards the gun rear end side is stopped by the muzzle side lower tip section 3b of the slide 3 coming into contact with this side backward movement prevention section 2a (refer to
The hammer 20 starts rotating toward the muzzle side due to the urging of the hammer spring 21, but the shear locking section 20a of the hammer 20 comes into contact with the hammer locking section 18a of the shear 18 to stop the rotation of the hammer 20, and the hammer and the shear are locked.
Since the objective is to cause the hammer 20 to rotate and engage with the shear 18, it is also possible to arrive at an initial state for bullet firing shown in
Next,
Next,
In the state shown in
Next,
Next,
The gun rear end side tip of the inner barrel 5 that continues to move further to the rear due to inertial force enters between an outer peripheral surface of the bullet firing valve 26 and an inner peripheral surface of the chamber 11, moves further to the rear coming into contact with the bullet firing valve large diameter section 26b, and pushes the firing valve 26 to the gun rear end side against the urging force of the firing valve spring 28. As a result of this pushing, the bullet firing valve 26 slides to the gun rear end side. As a result of this rearward movement of the bullet firing valve 26, the bullet firing valve opening section 26c that was closed by the bullet firing valve packing 27 is opened.
As a result of the bullet firing valve opening section 26c opening, gas that was filled into the bullet firing air chamber 25a flows through the firing valve opening section 26c formed in the gun rear end side tip of the bullet firing valve 26 and enters the gas passage 26d inside the bullet firing valve, and flows from the muzzle side opening section of the bullet firing valve 26 into the gun rear end side of the inner barrel 5.
Next,
Next,
The blowback valve flange section 29c is separated from the blowback valve packing 30 by the forward movement of the blowback valve 29 towards the muzzle side, and together with this the blowback valve opening section 29a is also separated from the blowback valve packing 30 thus releasing the airtight state, and opening to the inside of the blowback air chamber 25b. In this manner, gas inside the blowback air chamber 25b passes from the blowback valve opening 29a through the gas passage 29b inside the blowback valve and flows out to a clearance of the cylinder pressure surface 33a that exists at a gun rear end side of the cylinder 33, and as a result of the cylinder pressure surface 33a pressing backwards the cylinder 33 and the slide 3 integrally provided with the cylinder 33 start to move backwards to the gun rear end side.
On the other hand, after firing of the bullet W, the bullet firing valve 26 slides to the muzzle side under the urging force of the bullet firing valve spring 28 that has been compressed, and the bullet firing valve large diameter section 26b presses the gun rear end of the inner barrel 5 it is in contact with to the muzzle side. Together with this, a bullet firing valve flange section 26e of the bullet firing valve 26 comes into contact with the bullet firing valve packing 27 of the bullet firing air chamber 25a, and the bullet firing valve opening section is closed by the bullet firing valve packing 27. This state is the same as the state shown in
Next,
Accompanying movement of the slide 3 to the gun rear end side, the engagement lug section 16b of the trigger bar 16 slides on an inclined surface inside a disconnect indent 3a of the slide 3, to be pressed downwards in the gun. In this way, engagement between the trigger engagement lug section 18b of the shear 18 and the shear engagement lug section 16c of the trigger 16 is broken. The shear 18 rotates clockwise (to the hammer 20 side) about the shear shaft 18c under the urging force of the shear spring 19, and returns to a position engaged with the hammer 20.
Next,
The blowback valve 29 slides to the gun rear end side due to the resilience of the compressed blowback valve spring 31. In this way, the blowback valve 29 has the blowback valve flange section 29c coming into contact with the blowback valve packing 30 of the blowback air chamber 25b, and at the same time the blowback valve opening section 29a is closed up by the blowback valve packing 30. This state is the same as the state shown in
Next,
The hammer 20 starts rotating in an anti-clockwise direction about the hammer shaft 20b due to the urging force of the hammer spring 21, but the shear locking section 20a of the hammer 20 comes into contact with the hammer locking section 18a of the shear 18 to stop the rotation of the hammer 20, and the hammer and the shear 18 are locked.
Next,
The barrel latch 9 is then pushed up by the upper tip section 14b of the trigger 14 due to the movement of the trigger 14 returning to the original position. After that, at the point in time where the barrel housing engagement section 9b of the barrel latch 9 comes into contact with the barrel latch engagement section 8a of the barrel housing 8, the barrel latch 9 is locked.
The present invention is used as an air gun having a blowback function.
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Number | Date | Country | |
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20100263652 A1 | Oct 2010 | US |