PNEUMATIC WEAPON SYSTEM
A pneumatic weapon is described. The pneumatic weapon includes a gas storage chamber in fluid communication with a breech that houses a projectile. The weapon also has a gun barrel in fluid communication with the breech. A barrier is situated intermediate the projectile and the gun barrel. The barrier impedes the forward movement of the projectile until gas is released from the gas storage chamber and the pressure within the breech builds to a point sufficient to force the projectile through the barrier and out the gun barrel. The weapon also has several unique projectile storage devices that function with the aid of recycled gas.
This application claims the benefit of my prior co-pending provisional patent application Ser. No. 61/351,874, filed Jun. 5, 2010, the disclosure of which is incorporated by reference as if fully set forth herein.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates generally to pneumatically powered weapon systems that are analogous to those used to fire paintballs. More particularly, the present invention relates to pneumatic weapon systems, such as pneumatic rifles, that propel projectiles (e.g., BB's, pellets) at forces and speeds approximating or exceeding those measured with traditional firearms.
2. Description of the Related Art
Pneumatic or “air” powered pistols and rifles are well known in the art and are especially popular in the sport of “paintball”. As used herein the terms “pneumatic”, “air” and “gas” are all interchangeable because the weapon systems discussed herein may utilize several types of compressive gas such as air, nitrogen, CO2, and the like. Also, the terms “round”, “ammunition”, and “projectile” are interchangeable as used herein.
Usually pneumatic weapons fire very small caliber rounds, including BB's, various forms of pellets, or polymer spheres containing paint or dye. Air rifles and pistols have well known advantages, including the use of low cost ammunition, the production of relatively less noise as compared to a firearm, and the ability to be safely fired inside a dwelling, practice area or the like. While many air rifles and pistols are used as toys, their use and effectiveness as training devices, particularly the automatic versions, are well recognized.
Prior art semi-automatic and automatic gas guns suffer from unreliable firing mechanisms, and jams are common. Many are difficult to reload or service. Typical magazines for pneumatic BB guns, for example, have limited capacity. Ammunition feeding difficulties result in relatively low firing rates. To correct for feeding difficulties from gas leakage and the like, manufacturing tolerances must be minimized, raising costs. Moreover, known air guns are capable of mating only with a single magazine at once, complicating desired changes between different types of ammunition. In known designs the entire magazine and/or breech and/or barrel must be changed to switch between different types of ammunition. Further, known feeding mechanisms tend to be optimized for a single type of round, i.e., BB's or pellets, which detrimentally affects the available rate of fire when different types of ammunition are used in a single weapon.
The known designs of pneumatic weapons fail to provide a mechanism by which a user may fire two different types of ammunition without having to change magazines, reload, and/or change other components of the weapon. Furthermore, the known designs of pneumatic weapons fail to provide performance that approach or exceed that of standard firearms.
SUMMARY OF THE INVENTIONIt is, therefore, a primary object of the present invention to provide a pneumatic weapon capable of automatic fire, semi-automatic fire or both.
It is a further object of the invention to provide a pneumatic weapon that is capable of firing two or more different types of ammunition without having to change magazines, reload, or change other parts of the weapon such as barrels or a breech.
The above objects are met by the present invention, in which according to one aspect, provides a pneumatic weapon capable of being loaded with two different types of projectiles simultaneously and firing two different types of projectiles through the same barrel. In broad terms, the pneumatic weapon according to the invention is comprised of three basic sections: a solenoid section for providing a source of compressed gas; a barrel section; and a firing section intermediate the solenoid section and the barrel section. The firing section receives projectiles and aligns the projectiles with the barrel. The firing section also receives compressed gas from the solenoid section that provides the energy to fire a projectile. Furthermore, the firing section contains a barrier situated between the projectile and the barrel. The barrier impedes the forward progress of the projectile into the barrel thus providing for the building of gas pressure behind the projectile. When the gas pressure is sufficient to overcome the resistance provided by the barrier, the potential energy of the compressed gas is instantaneously converted to kinetic energy as the projectile fires through the barrier and out of the barrel.
These and other more detailed and specific features of the present invention are more fully disclosed in the following specification, reference being had to the accompanying drawings, in which the terms “left” and “right” designate the side of the weapon that would be on the user's left hand side or right hand side when firing the weapon (note: firing the weapon left-handed or right-handed does not alter the orientation of the weapon to the user):
In the following description, for purposes of explanation, numerous details are set forth, such as device configurations and movements, in order to provide an understanding of one or more embodiments of the present invention. However, it is and will be apparent to one skilled in the art that these specific details are not required to practice the present invention.
Furthermore, the following detailed description is of the best presently contemplated mode of carrying out the invention based upon the existing prototype. The description is not intended in a limiting sense, and is made solely for the purpose of illustrating the general principles of the invention. The various features and advantages of the present invention may be more readily understood with reference to the following detailed description taken in conjunction with the accompanying drawings.
The terms “left” and “right” as used herein designate the side of the weapon that would be on the user's left-hand side or right-hand side when firing the weapon (note: firing the weapon left-handed or right-handed does not alter the orientation of the weapon to the user). Likewise, the terms “front” and “rear” are to be interpreted in the context of a user firing the weapon (i.e., the gun barrel muzzle is at the “front” of the weapon while the stock is at the “rear”).
Referring now to the drawings in detail, where like numerals refer to like parts or elements, there is shown in
The pneumatic rifle 20 may be adapted to fire round (e.g., BBs) or conical (e.g., bullets) ammunition. For ease of discussion this detailed description will utilize BBs and/or pellets in the description of the invention. One unique feature of one embodiment of the weapon according to the invention that is discussed in greater detail below is that the weapon is capable of firing two different types of ammunition (e.g., BBs and pellets) without having to reload, change feeding systems, or change magazines or barrels. By operator selection of the appropriate control and feed structures to be described, the operator can switch between either of these two preferred projectiles, and firing can be either semi-automatic or full automatic as described hereinafter. Switching from one type of ammunition to another has obvious benefits in law enforcement situations where an officer can switch from non-lethal ammunition (e.g., rubber balls) to lethal ammunition (e.g., steel) without having to take the time to switch weapons or reload a single weapon. Similarly a weapon that can fire both in a full automatic or semi-automatic mode has certain advantages, particularly in military situations.
Rifle 20, comprises a plurality of interrelated sections, best seen in
Returning now to
Turning now to
The high pressure gas storage unit 56 is shown in
There are two borings, beginning at the front of the gas storage unit 56 and extending to a point near the rear of the unit, that are generally parallel to the longitudinal axis of the unit and which create an upper air passage 58 and a lower air passage 59. Both the upper air passage 58 and the lower air passage 59 terminate in threaded ends 60 at the front of the gas storage unit 60.
Turning now to the rear of the gas storage unit 56 as shown in
The second and lower portal at the rear of the gas storage unit 56 which provides fluid communication with the gas storage chamber 57 is designated the gas feed port 72. As shown in
In a preferred embodiment of the invention, the weapon according to the invention is a hand held, mobile weapon (e.g., pistol or rifle) carried by user. The weapon is connected to a mobile compressed air tank (not shown) carried by the user via a high pressure hose which attaches to the quick couple connector 74 engaged in the gas feed port 72. This arrangement of components provides the user with a long term supply of compressed gas for long term operation of the weapon.
Turning again to
Furthermore, the storage chamber 57 could be formed by a creating a single large boring on the front end of the gas storage unit 56 instead of two smaller borings. As discussed in more detail below, there is a volumetric relationship between the amount of gas utilized to fire the weapon and the kinetic energy transferred to the projectile. Accordingly, one skilled in the art can increase or decrease the power of the weapon by adjusting the volume of the gas storage chamber 57.
The weapon according to the invention is controlled and fired electronically via an electronic firing mechanism schematically shown in
The firing mechanism also comprises a microprocessor (not shown) that is programmable to provide for semi-automatic, automatic, or repetitive burst (e.g., 3 rounds in succession) firing. Such programmable microprocessor controlled firing mechanisms are known in the art and need not be discussed in detail herein. By pulling the trigger 80 a user activates the solenoid. The solenoid opens allowing gas from the gas storage unit to flood through the solenoid and into the gun body 93 and breech 250 ultimately resulting in the firing of a projectile from the weapon. This aspect of the invention is discussed in more detail below.
The battery pack 75 and its associated wiring can be located anywhere along the frame of the weapon. In the prototype of the invention and the Figures, the battery pack 75 is attached to the weapon below the gas storage unit 56. This location was chosen to reduce the length of wire necessary to connect the battery pack 75 to the other two electrical components on the weapon: the trigger assembly 30 and the solenoid 84.
As shown in
The upper horizontal plate 53 serves a second function in that it provides the lower attachment point for the gas storage unit 56 as shown in
The trigger assembly 30 utilized in the practice of the invention may be any of several commercially available options currently on the market for use in electronic pneumatic weapons or even tools. The exact trigger assembly 30 used in the practice of the invention is a user preference decision. The trigger assembly 30 is secured to the frame via standard means which may vary depending upon the trigger assembly purchased by the practitioner. In most instances the trigger assembly will likely be attached to the frame (e.g., handle bracket 50) by a bolt. However, there is a degree of flexibility in the exact placement of the trigger assembly 30 in the practice of the invention. For example, the trigger assembly 30 can be moved further back on the handle bracket 50 or forward to attach directly to the forward handle bracket 51.
Practitioners should note that the frame utilized in the practice of the invention, and thus the overall appearance of the weapon, can vary depending upon the preferences of the practitioner. As those skilled in the art recognize, weapon frames can be altered to fit the particular needs of the user. For example, a tall shooter with long arms may prefer a longer overall weapon which could translate into using a longer top mounting plate 49 or a longer handle bracket 50. Thus, the geometry of the frame parts discussed herein are to provide the reader with an understanding of how the prototype was assembled but the geometries discussed herein should not be interpreted as limiting the scope of the invention.
Turning again to
The remaining component of the solenoid control section 24 to be discussed is the solenoid valve 84. A tubular, threaded coupling 92 connects the gas storage unit 56 to the solenoid 84 and provides fluid communication between the gas storage chamber 57 and the interior of the solenoid valve 84. A similar tubular, threaded coupling identified as velocity tube 94 connects the solenoid valve 84 to the firing section 28 and the firing chamber 108 in particular,
The solenoid valve 84 utilized in the practice of the invention is a standard, commercially available (although modified) pneumatic solenoid valve such as those available from STC of Palo Alto, Calif. The prototype weapon utilized a “T-shaped” STC model 2E200-34 originally rated at 800 psi out of the box. An early prototype of the weapon employed this solenoid valve with satisfactory results. However, at the inventor's request, STC modified the solenoid valve such that it was rated at 1500 psi. Other pneumatic solenoid valves with even higher psi ratings (e.g., 5800 psi) are available to consumers and can be used in the practice of the invention. However, at this time such pneumatic solenoid valves are very heavy and are not practical for a hand carried weapon. As solenoid valve technology improves new generations of solenoid valves can be incorporated into the practice of the invention.
As shown in
The solenoid control section 24 is connected to the next forward section of the weapon: the firing section 28. The connection between the solenoid control section 24 and the firing section 28 is twofold. First, the two sections are connected by frame pieces (e.g., top mounting plate 49 and forward handle bracket 51) as shown in
The gun body 93 is the primary component of firing section 28 and will be described first. As shown in
Turning now to
The top edge of the rear section 109 of the gun body 93 is continuous with the top edge of the middle section 110 of the gun body 93. However, the bottom edge of the rear section 109 is situated apart from the bottom edge of the middle section 110 of the gun body 93 thus defining a small recess at the lower rear of the gun body 93 which gives the rear section 109 of the gun body 93 a more square cross section than the remainder of the gun body 93. The rear section 109 of the gun body 93 is also defined by a boring, the velocity pin port 106, that provides fluid communication between the solenoid 84 and the middle section 110 of the gun body 93. The velocity pin port 106 also houses a mechanism to control the transfer of projectiles into the breech. This mechanism is discussed in more detail below.
The middle section 110 is the location of the breech 250 and the point of the attachment for projectile storage devices. As shown in
Continuing with
Turning now to
The forward end of the velocity pin port 106 terminates at the firing chamber 108 (
Both the velocity pin guide 102 and the velocity pin plunger 99 are further defined by a plurality of very small (e.g., 0.5 mm) holes traversing the body of each which provides fluid communication throughout the velocity pin port 106 and into the firing chamber 108. However, the plurality of small holes in the velocity pin plunger 99 and the velocity pin guide 102 are not of a number or of a size that would substantially eliminate resistance to fluid (e.g. gas) flow through each. This is particularly important with respect to the velocity pin plunger 99 as its function is to reciprocate, and thus cause reciprocal movement of the velocity pin 100, in response to changes in air pressure in the velocity tube 94 and the velocity pin port 106 during firing of the weapon. The movement of the various parts of the weapon during firing is discussed in more detail below.
The rear section 109 of the gun body 93 is connected to the top mounting plate 49 via threaded holes 41 and screws (not shown) (
Situated directly beneath the velocity pin 100 apparatus is a series of components that make up the top clip assembly 116.
Turning to
The top clip bolt 117 is received within a top clip channel 112 that is machined in the bottom of the rear section 109 of the gun body 93.
Enclosing and securing the top clip assembly 116 to the rear section 109 of the gun body 93 is a top pin guide plate 121. The top pin guide plate 121 is generally “L” shaped having a vertical arm 124, a horizontal arm 125, and a plug 126 abutting the vertical arm 124 and sized to fit snuggly within top clip channel 112. The vertical arm 124 of the top pin guide plate 121 is also defined by three bores: two for mating with machined screw holes in the gun body 93 and one aligned with a similar bore in the plug 126. The bore in the plug 126 and its aligned bore in the vertical arm 124 receive top clip pin 118 when a “clip” or magazine is engaged with the weapon.
The final two components necessary for the operation of the top clip assembly 116 are the top clip bolt handle 120 and the clip breech slot 127.
The clip breech slot 127 is preferably of a length that enables the top clip assembly 116, and specifically the top clip bolt 117, to engage with a cover 305 of a “clip” or magazine and move the cover such that it provides an entry point into the gun body 93 for ammunition as shown by the cross section in
The gun body middle section 110 is defined by several characteristics and components. The gun body middle section 110 can be divided into two general sections: the firing chamber 108 and a lower loading chamber 133 that are generally separated by the top clip assembly 116 when the top clip assembly 116 is moved to a forward position as in
The description of this portion of the gun body 93 will begin with the firing chamber 108.
Staying with
The lower loading chamber 133 is situated directly beneath the firing chamber 108 as shown in
Returning to
The breech block lower assembly 140 comprises a breech block 141, a breech block bolt 142, a breech block pin 143, a breech block pin guide 144, a breech block spring 145 (shown in
The breech block 141 contains a threaded hole that traverses its front to back width. The hole has two diameters: a rear diameter sufficient to receive the breech block pin guide 143 and a larger, more forward diameter to receive the breech block pin 143 and breech block pin guide 144.
A small breech block slot 148,
The breech block pin 143 is advanced through the breech block 141 until it protrudes from the rear wall of the breech block 141 as shown in
As shown in
As a general matter, the firing of the weapon according to the invention requires the generation of high gas pressures within the firing chamber 108 and any component that is in fluid communication with it. Therefore all components of the weapon should be precisely machined to eliminate gaps between parts. In the prototype of the invention the application of gun grease between the connecting parts was sufficient to maintain an air tight firing chamber capable of 1500 psi. However, “O” rings were employed in a few critical locations to help prevent leaks. As pressures increase with improved solenoid technology additional measures such as including additional “O” rings may be needed in future models.
Turning now to the components that provide ammunition to the firing chamber, this discussion will begin with a description of a projectile storage device designed to store spherical projectiles and referred to herein as the spherical projectile magazine 21 shown generally in
Turning now to
Although the inner diameter of the cylindrical cover 201 remains constant throughout its length, the end of the cylindrical cover 201 proximate the base 203 has an outer diameter that is less than the outer diameter of the end of the cylindrical cover 201 distal to the base 203 thus allowing the cylindrical cover 201 to couple with a cylindrical boring 204 in the base 203 and provide a uniform inner diameter throughout the chamber created inside the spherical projectile magazine 21.
Situated within the chamber created by the cylindrical cover 201 and the base 203 is a spherical tower 202. The spherical tower 202 is defined by a central core 205 having a ramp 206 spiraling toward the bottom of base 203 at an approximately 12 degree pitch. The spiral ramp 206 terminates at the bottom of the cylindrical bore 204 in the base 203 proximate an opening the base 203 that is the entrance to a projectile feed port 207.
Those skilled in the art will note that the alignment of the terminus of the spiral ramp 206 with the opening to the feed port 207 must be precise,
The side of the base 203 that is adjacent to the gun body 93 is machined or otherwise configured to form a face plate 209 which abuts the side of the gun body 93. The stem 200 juts from the face plate 209 and is received by projectiles portal 129. An “O” ring 222 is situated in a groove in the face plate 209 encircling the stem 200 to aid in forming an air tight seal between the spherical projectile magazine 21 and the firing chamber 108. Alternatively, the feed port 207 could terminate at the face of face plate 209 and align with projectile portal 129 thus eliminating the stem 200.
At a point on the cylindrical cover 201, preferably maximally distal from the base 203, there is a loading port 210 through which spherical ammunition may be loaded into the spherical projectile magazine 21.
The gas that enters the spherical projectile magazine 21 through cylindrical cover gas portal 212 aids in maintaining the progress of ammunition toward the ammunition feed port 207. In normal firing positions this gas assistance will not be needed to maintain a steady feed of spherical ammunition to the firing chamber 108 due to gravity. However, with the gas assist a user of the weapon should be able to hold the weapon upside down and still maintain a suitable ammunition delivery into the firing chamber 108.
Another point of novelty regarding the weapon according to the invention is its ability to switch between two different types of ammunition without having to change magazines or barrels or the mechanics of the firing chamber. A user of a weapon according to the invention can change from one type of ammunition to another simply by adjusting two levers. One such lever is located in the base 203 of the spherical projectile magazine 21.
Turning to
There is another embodiment of projectile storage device that is used to store spherical projectiles in the practice of the invention. This embodiment, as utilized in a prototype of the invention and shown in
The loading component 161 comprises a projectile feed portal 163 that communicates with the “L-rail” spherical projectile storage chamber 164. The “L-rail” projectile feed portal 161 is sealed by a cap 165. In preferred embodiments the cap 165 also acts as a one-way gas valve for reasons explained later.
At the bottom of the loading component 161 and running along the longitudinal axis of the storage component 162 is the storage chamber 164. The storage chamber 164 runs the length of the storage component 162. At the end of the storage component 162 that is adjacent the loading component 161, there is found residing in the storage chamber 164 a projectile biasing device generally represented by element number 166. The “L-rail” projectile biasing device 166 continuously feeds spherical projectiles toward the opposite end of the storage chamber 164 and into the breech 250 of the weapon.
The “L-rail” projectile biasing device 166 can incorporate any method or combination of components capable of pushing spherical projectiles toward the breech of the weapon. In the embodiment shown in
An alternative, but preferred component of the “L-rail” projectile storage device 160 is a self-lubricating mechanism generally represented by element 174. The self-lubricating mechanism 174 comprises a lubrication portal 175 that is in fluid communication with the storage chamber 164. The lubrication portal 175 is sealed by a threaded plug 173. Within the lubrication portal 175 resides a porous plug (not shown) that is preferably made of a porous polymer. A small amount of gun oil can be applied to the porous plug.
One of the benefits of the design of the “L-rail” is that it provides for exceptional, non-jamming feed of projectiles to the weapon along with a method of lubricating the weapon which in turns aids in maintaining the high pressures needed to achieve optimum performance of the weapon. During use of the weapon, spherical projectiles 172 leave the “L-rail” and enter the weapon. When the projectile is fired a small vacuum is created in the “L-rail” as gas is drawn down the barrel of the gun. The one-way valve in the cap 165 allows the “L-rail” to “breathe” and eliminate the vacuum. However, the very slight vacuum that does occur serves to slowly pull oil out of the self-lubricating mechanism and into the storage chamber 164 and onto the projectiles 172. This minute amount of oil is then distributed throughout the gun body 93, particularly the area immediately surrounding the firing chamber 108.
Turning now to the portion of the weapon that fires projectiles, the firing chamber 108
Of the 4 generally rectangular side walls, three are defined by openings. The first wall 254 (or “left” wall as shown in
The second wall 255 (or “front” wall) of the breech contains a round opening 259 that is coaxial with the barrel and sized to be slightly larger than the diameter of the projectile that is to be fired from the weapon.
The breech 250 is further defined by a body 253.
The second (or front) wall 255 abuts the forward wall of the firing chamber 108 which is the general demarcation line for the front section 111 of the gun body 93.
The barrel bore 270 receives the barrel 271,
One novel feature of the weapon according to the invention is its novel use of compressed gas to fire a projectile. Known pneumatic weapons utilize a blast of compressed gas to propel a projectile unimpeded out of a barrel. Until now, the conventional wisdom in gun making is that impeding the path of a projectile out of a gun, such as by plugging the barrel, would make the gun inoperable and likely lead to disastrous results. For example, plugging the barrel of a conventional firearm can cause the gun to explode when the gun is fired.
The weapon according to the invention opposes this convention by placing a barrier directly between the projectile and the barrel for the specific purpose of impeding the forward progress of the projectile. Furthermore, it is this impedance of forward movement of the projectile and the manner in which it is carried out that gives the weapon its power. This aspect of the invention is discussed in greater detail below.
The barrel bore 270 also receives another component that directly relates to another novel aspect of the invention: a barrier 290 intermediate the breech 250 and the barrel 27.
The barrier 290 as used in the practice of the invention is a device that prevents the movement of the projectile from the breech 250 to the opening of the gun barrel 271 in the absence of applied pressure. More specifically, the barrier 290 is a device that is generally coaxial with the projectile and the gun barrel 271 and contains an opening 293 that traverses its length. The opening 293 is capable of providing fluid communication between the breech and the gun barrel, although as described below, in most instances the interaction between the projectile and the breech results in intermittent fluid communication between the breech 250 and the gun barrel 271.
The barrier 290 impedes movement of a projectile due to the size of the aforementioned opening 293. The opening 293 is smaller than the projectile. Thus when the force of gas through the solenoid and gun body pushes the projectile toward the gun barrel, the barrier prevents its forward movement until the pressure in the gun body 93 (specifically the firing chamber 108) reaches a point that it forces the projectile through the opening thereby instantaneously converting the potential energy of the gas pressure into kinetic energy of the projectile.
Turning now to a preferred embodiment shown in the Figures, the barrier used in the practice of the invention is an annular bushing 290 having a cylindrical opening extending throughout its length. The exact size and shape of the barrier may vary depending on the design of the gun barrel 271, gun body 93 borings, etc. For example, some gun barrels are octagonal.
Likewise, the opening that defines the barrier may also vary in its size and shape. As shown in
Preferably the input face of the velocity bushing 290 (the face adjacent the firing chamber 108 and the front wall 255 of the breech 250) is slightly conically tapered to the inner diameter to allow for the setting of a projectile into firing position by the velocity pin 100.
The dimensions shown in
Although the barrel spacer 291 can be an optional component, its use is recommended because if it is removed it is easy to tighten the barrel 271 too tight and distort the geometry of the velocity bushing 290. The inner diameter of the barrel spacer should be equal to the inner diameter of the barrel.
In a prototype of the invention designed to fire a .313 caliber round, steel projectile, the velocity bushing 290 was made of natural 90A durometer polyurethane. The velocity bushing was 0.5 inch long by 0.5 inch wide. The outer diameter was 0.5 inch and the internal diameter was 0.28 inches. During operation, because the inner diameter of the velocity bushing 290 is smaller than the outer diameter of the projectile, the velocity bushing 290 initially prevents forward movement of the projectile. Because the face of the velocity bushing 290 adjacent the projectile is tapered to create a generally concave face, it snugly receives a portion of a rounded projectile. In other words, the concave face of the velocity bushing receives the convex projectile which provides for an even distribution of resistive force on the face of the projectile which greatly stabilizes the projectile in the breech.
When the trigger is pulled the solenoid opens releasing gas from the gas storage unit which travels through the velocity port 106 and into the firing chamber 108. Pressure builds in the firing chamber 108 almost instantaneously pushing the projectile toward the velocity bushing 290. Yet, because the velocity bushing 290 prevents the forward movement of the projectile, and creates an air tight seal, the pressure in the firing chamber 108 builds to pressures beyond that seen in known pneumatic weapons. When the gas pressure reaches a certain level (1500 psi in the prototype), the potential energy of the compressed gas overcomes the resistance provided by the velocity bushing 290 and the projectile if forced through the opening 293 in the bushing 290. The potential energy of the compressed gas is then almost instantaneously converted to kinetic energy of the projectile as it shoots through the velocity bushing 290 and out the barrel.
This conversion of potential energy to kinetic energy is much more efficient than the conversions seen in current known pneumatic weapons. In known pneumatic weapons unimpeded projectiles slowly gather kinetic energy as the initial burst of gas immediately dissipates down the barrel. Alternatively, known weapons place an insubstantial and non-air-tight barrier in front of a projectile to keep it from rolling out a down turned barrel (e.g., a flap hinge). In contrast, the gas released by the firing mechanism in the invention is not immediately dissipated or used to knock over a weak flap. Instead, the gas is trapped and builds pressure thereby storing additional potential energy that is then transferred to the projectile.
Using the prototype velocity bushing 290 described above the weapon was capable of firing a .313 round, steel projectile at 1000 feet per second. This type of velocity bushing 290 is also very durable in that prototypes of the invention have fired over 2000 rounds before noticing a decline in power or accuracy.
As those skilled in the art can readily see, altering stiffness of the velocity bushing 290 (e.g., using a different polymer), or changing the geometry of the velocity bushing (specifically the internal diameter of the bushing), or increasing or decreasing the size of the fired projectile can all effect the final pressure at which a projectile is fired and thus alter the muzzle velocity (or power) of the projectile as it leaves the barrel.
For example, another planned prototype of the invention is a .50 caliber weapon using a .50 caliber barrel and a 90A durometer polyurethane velocity bushing 290 having a 0.75 inch outer diameter, an inner diameter (ID) less than 0.75 inch (exact ID is variable depending on pressure used), and a length of 0.75 inch.
Turning now to the barrel section of the invention, the barrel bore 270 receives the barrel 271 to be used in the practice of the invention. The barrel 271 utilized in the practice of the invention can vary from a standard straight non-rifled barrel such as those used in BB guns or muskets to complex rifled barrels with noise reduction components and gas assist mechanisms. The former type of barrel is well known in the art and need not be described in detail here. The latter type of barrel was used in a prototype of the invention and is described herein.
The barrel 271 may be made of any of the standard materials (e.g., steel alloys) that are used to make gun barrels. Similarly, the barrel 271 may be of any reasonable length. The prototype of the invention used a stainless steel barrel 271 approximately 24 inches in length. The barrel 271 was rifled due to the simultaneous use of round projectiles and oblong projectiles (e.g., pellets) with skirts that may expand upon release of the compressed gas and engage with the rifling. Standard rifling techniques were utilized to place rifling 273 in the barrel as shown in
Another type of rifling technique utilized in the practice of the invention is spiral venting. As shown in
As a spherical projectile traverses the vented portion of the barrel 271, the pattern of the escaping gas causes the spherical projectile to rotate or twist in a fashion similar to that of lead bullet leaving a standard rifle. This improves the accuracy of the weapon according to the invention when using spherical ammunition as compared to other pneumatic weapons.
The vents 274 serve another purpose as well. That purpose is to provide a gas assist mechanism which aids in the feeding of ammunition from a bottom loaded magazine and recycles a portion of the compressed gas utilized to fire the weapon.
The cylindrical cover 280 seals itself against the flange 282 and is partially enclosed at the muzzle end of the barrel. The muzzle end 288 of the cylindrical cover 280 is defined by an annular flange having a inner diameter sufficient to receive the end of the barrel 271 and a plurality of vents for expelling a portion of the gas that is expelled at each firing.
The locking ring 281 preferably contains a return gas port 286 drilled within the flange 282. The return gas port 286 comprises a one way valve connected to a standard gas coupling 287 which in turn connects to a gas return line 277 which leads to a bottom feed ammunition magazine.
Another novel feature of the present invention is the relative ease with which the weapon may be modified to fire different ammunition of different caliber.
Generally speaking, .50 caliber ammunition is much heavier and more expensive than .22 caliber ammunition. Accordingly, a user of the weapon may not want to fire .50 caliber ammunition at all times (e.g., during practice or training). Such a user can change the weapon to fire .22 caliber ammunition by simply inserting a smaller .22 caliber barrel insert 269 into the .50 caliber barrel. The user can begin the transformation by removing the breech 250 from the weapon and inserting a .22 caliber spacer 291 and velocity bushing 290. The breech 250 is then replaced and the .22 caliber barrel insert 269 is inserted into the .50 caliber barrel. The end of the .50 caliber barrel is threaded to receive the barrel cap 268. The barrel cap 268 is an annular cap with an opening that receives the muzzle end of the barrel insert 269. Engaging the barrel cap 269 with the barrel insert 269 and the end of the .50 caliber barrel locks the barrel insert 269 in place. Thus after replacing only two items and inserting a third, the weapon is ready for firing .22 caliber ammunition.
Note that a forward “L” shaped bracket 297 having a plurality of holes for receiving the barrel 271, breech block pin 143, the gas return line 277 and a forward hand grip 298 (or other similar type of hand rest) completes the frame of the weapon as shown in
The weapon according to the invention preferably contains a dual feeding system for ammunition that allows the weapon to fire at least two different types of ammunition without having to change barrels or breeches. One type of ammunition, spherical projectiles (e.g., BBs), was discussed previously. This section will discuss a second type of projectile that is non-spherical and is shaped more like traditional pellets or bullets.
The return gas line 277 extends from the gas collection mechanism 279 rearward to couple with a second type of projectile storage device that can be used with the weapon accordingly to the invention. This second type of storage device is similar to known “clip” magazines for holding bullets and is shown as a magazine 32 in
In a preferred embodiment of this type of projectile storage device, the clip magazine 32 comprises an outer rectangular sleeve 300 that is open on both ends with at least one tension device 302 disposed therein. Attached to the bottom of the rectangular sleeve 300 is a base plate 301 from which a tension device extends. In preferred embodiments the tension device is one or more springs 302. The magazine springs 302 engage with a magazine plunger 303 via spring receiving sleeves 309 located on the bottom of the magazine plunger 303. The tension device (e.g., magazine springs 302) bias the plunger 303 toward the second end of the magazine 32.
Attached to the top of the rectangular sleeve 300 (the end opposite the base plate 301 or the “second” end of the magazine) are two magazine cover brackets 304. The magazine cover brackets 304 are “L” brackets and are attached to longitudinally to the top of the rectangular sleeve 300 such that each creates a slot for receiving a longitudinal edge of a magazine cover 305 as shown in
Projectiles are loaded into the clip magazine 32 from the top of the magazine through the opening between the magazine cover brackets 304. The projectiles are pushed downward against the magazine plunger 303 to compress the magazine springs 302 as shown in
The clip magazine 32 is designed to engage with the middle section of the gun body 93, specifically the lower loading chamber 133. More specifically, to engage the magazine 32 with the gun body 93, the breech block bolt 142 is moved forward thus moving the breech block 141 forward in the lower loading chamber 133. The magazine 32 is inserted into the void created in the lower loading chamber 133 by the forward movement of the breech block 141. Once the magazine 32 is in place the breech block bolt 142 is released and the breech block spring 145 moves the breech block 141 and the breech block pin protrusion 146 rearward where the protrusion 146 engages with a small hole 308 in the top of the magazine 32 thereby locking the magazine 32 in place as shown in
Continuing with
Turning now to the operation of the weapon according to the invention, the weapon may be fired in automatic or semi-automatic mode using one type or two different types of ammunition. The semi-automatic mode will be discussed first.
The trigger 80 is then pulled completing the circuit activating the solenoid 84. Upon activation, the solenoid 84 opens allowing high pressure gas to flow almost instantaneously from the gas storage chamber 57 through the velocity tube 94 where it both presses the velocity pin plunger 99 forward and fills the velocity pin port 106 and firing chamber 108 with high pressure gas due to the perforations in the velocity pin plunger and velocity pin guide 102.
As the velocity pin plunger 99 and thus the velocity pin 100 move forward, the forward terminus of the velocity pin 100 engages the rear of the round that is in the firing chamber 108 thereby seating it coaxially within the slight conical depression in the rear face of the velocity bushing 290. The velocity bushing 290 restrains forward movement of the round until the pressure in the firing chamber 108 builds to a point sufficient to overcome the resistance provided by the velocity bushing 290.
At that point, the round is violently forced through the aperture of the velocity bushing 290 and the potential energy of the compressed gas is converted into the kinetic energy of the round.
When the round is fired through the velocity bushing 290 there is a momentary drop in air pressure sufficient to allow the velocity return spring 104 to push the velocity pin plunger 99 and the velocity pin 100 rearward for a distance sufficient to allow another round to enter the firing chamber 108.
For automatic fire the process is exactly the same with a couple of exceptions. First, the trigger circuit microprocessor is programmed to remain open until the trigger is released. Thus, the solenoid remains open and gas continuously floods the firing chamber 108 firing round after round until the ammunition is spent (or the trigger is released). Secondly, the gun body 93 is equipped with a small automatic fire port 231 in which resides an automatic fire pin 230 which is schematically represented in
Alternatively, the trigger circuit microprocessor can be programmed to fire bursts of rounds of any given number (e.g., 3, 5, or 7 round bursts). As noted previously, such programmable firing mechanisms are known in the art and need not be detailed here. Prototypes of the invention have achieved a rate of fire of 30-40 rounds per second depending on the pressures used, diameter of opening in the velocity bushing, etc.
Spherical ammunition is fired through the weapon in a similar manner. To fire spherical ammunition one must first isolate the magazine 32. This is accomplished by moving the top clip assembly 116 to a forward position thus re-engaging the magazine cover 305 with the magazine cover brackets 304 as shown in
If the ammunition blocking pin 215 (
It is also worth noting two design features that provide for continued fire of spherical ammunition even if the weapon is held upside down. First, the magnets 262 utilized in the practice of the invention will typically hold a chain of 8-12 or more projectiles depending on the size of the projectile and strength of the magnet. Current prototypes utilize magnets capable of holding 8-10 .313 caliber projectiles in a continuous chain extending from the firing chamber back into the magazine.
Second, the spherical projectile magazine 21 is pressurized via a gas line 214 that connects directly to the gun body 93, specifically the velocity pin port 106, via gas port 216. As the velocity pin plunger 99 moves forward during a firing sequence it unblocks the gas port 216 allowing the gas flowing from the open solenoid 84 to flow through gas line 214 and pressurize the spherical projectile magazine 21 along with the firing chamber 108.
When the round fires and travels down the barrel it creates a “dragging/vacuum” effect in the firing chamber 108. Furthermore, the pressurized gas in the spherical projectile magazine 21 assists in creates a slight “push” of gas out of the stem 200 and into the firing chamber 108. These “pull and push” effects related to gas movement immediately after firing a round, in conjunction with the magnets 262, and the constant movement of ammunition toward the firing chamber 108 during operation, should be sufficient to feed spherical ammunition to the firing chamber 108 even if the weapon is held upside down.
In yet another embodiment, the invention comprises a method of expelling a projectile from the barrel of a pneumatic gun. The method according to the invention is generally described in the following paragraphs in reference to the apparatus that was described previously.
In general, the method according to the invention comprises the steps of providing a source of compressed gas that is in fluid communication with the breech of the pneumatic gun. The flow of compressed gas into the gun is preferably controlled by an electronic circuit such as that controlling the aforementioned solenoid.
The method according to the invention also comprises the step of placing a projectile in the breech of a pneumatic gun where the projectile is coaxial with a gun barrel. A barrier, such as the velocity bushing 290 described previously, is placed intermediate the projectile and the gun barrel.
Once the projectile is in the breech the electronic circuit initiates the flow of compressed gas into the breech. The pneumatic pressure inside the breech increases to a pressure sufficient to force the projectile through an opening in the barrier and out the gun barrel.
As many possible embodiments may be made of the invention without departing from the scope thereof, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.
While the invention has been described with respect to a various embodiments thereof, it will be understood by those skilled in the art that various changes in detail may be made therein without departing from the spirit, scope, and teaching of the invention. Accordingly, the invention herein disclosed is to be limited only as specified in the following claims.
Claims
1. A pneumatic weapon comprising:
- a gun barrel;
- a gun body containing a breech for receiving a projectile;
- a barrier positioned intermediate said breech and said barrel and coaxial with said barrel, said barrier defined by an opening therein permitting fluid communication between said breech and said barrel, said opening having a diameter sufficient to prevent a projectile from traversing the velocity bushing in the absence of applied pressure.
2. A pneumatic weapon according to claim 1 in which said barrier is a bushing defined by an inner diameter that is smaller than the outer diameter of said projectile.
3. A pneumatic weapon according to claim 2 further comprising:
- a gas storage chamber;
- a solenoid providing fluid communication between said gas storage chamber and said breech;
- a firing mechanism for activating said solenoid; and
- at least one projectile storage device capable of providing projectiles to said breech.
4. A pneumatic weapon according to claim 3 wherein said firing mechanism comprises an electronic circuit that activates said solenoid.
5. A pneumatic weapon according to claim 3 wherein the weapon comprises a first projectile storage device which contains a first projectile and a second projectile storage device which contains a second projectile, said first and second projectiles being different from one another.
6. A pneumatic weapon according to claim 2 wherein said bushing is defined by a concave face adjacent said breech.
7. A pneumatic weapon according to claim 1 wherein said barrier is made of a polymer.
8. A pneumatic weapon according to claim 3 that fires projectiles in a semi-automatic fashion, an automatic fashion or both.
9. A barrier for placement intermediate a projectile and a gun barrel, said barrier having an opening therein that is coaxial with said gun barrel and permits fluid communication with said gun barrel.
10. A barrier according to claim 9 wherein said barrier is a bushing.
11. A barrier according to claim 10 wherein said bushing has a concave face adjacent said projectile.
12. A barrier according to claim 9 wherein said barrier is made of a polymer and prevents the traversal of said projectile through said barrier in the absence of applied pressure.
13. A barrier according to claim 10 wherein said bushing has an inner diameter that is smaller than the outer diameter of said projectile.
14. A projectile storage device for a pneumatic weapon comprising:
- a base having a least one face adjacent said pneumatic weapon, said base comprising a boring and a projectile feed port for transferring projectiles to said weapon, said feed port in fluid communication with said boring;
- a spiral tower situated within said boring capable of transferring spherical projectiles to said feed port; and
- a cover enclosing said spiral tower, said cover having a loading port for receiving spherical projectiles.
15. A projectile storage device according to claim 14 further comprising an ammunition blocking pin for blocking the passage of spherical projectiles through said feed port.
16. A projectile storage device according to claim 14 further comprising a gas portal for receiving a gas into the interior of the projectile storage device.
17. A projectile storage device according to claim 14 wherein said feed port extends from said base.
18. A projectile storage device according to claim 14 wherein said feed port terminates at the face of the base that is adjacent to said weapon.
19. A projectile storage device comprising:
- a magazine, said magazine having a first end and a second end, said second end capable of supplying projectiles to a breech of a pneumatic weapon;
- at least one tension device disposed within said magazine;
- a magazine plunger connected to said tension device, said tension device biasing said plunger toward said second end of said magazine;
- a sliding cover connected to and covering said second end of said magazine; and
- a one-way gas portal providing fluid communication with the interior of said magazine.
20. A projectile storage device according to claim 19 wherein said tension device comprises at least one spring.
21. A projectile storage device according to claim 19 wherein said one-way gas portal is connected to a gas line that receives gas expelled from a barrel of said pneumatic weapon.
22. A projectile storage device according to claim 19 wherein said magazine is designed to store bullet shaped projectiles.
23. A mechanism to control the transfer of projectiles into the breech of a pneumatic weapon, said mechanism comprising:
- a breech;
- a port in fluid communication with said breech;
- a pin coaxially disposed within said port, said pin capable of reciprocal movement within said port and breech in response to changes in air pressure.
24. A mechanism according to claim 23 further comprising:
- a gas storage chamber;
- a solenoid intermediate said gas storage chamber and said port, said solenoid providing fluid communication between said gas storage chamber and said port; and
- a plunger coaxially disposed within said port and attached to said pin, said plunger providing resistance to fluid flow through said port.
25. A mechanism according to claim 24 further comprising a trigger mechanism controlling the transfer of gas through said solenoid and into said port.
26. A mechanism according to claim 25 wherein when said trigger mechanism is activated gas flows from said gas storage chamber through said solenoid and into said port thereby moving said plunger and pin toward said breech.
27. A projectile storage device comprising:
- a loading component;
- a storage component for storing projectiles, said loading component and said storage component being in fluid communication with each other;
- a one way gas valve integral to said loading component;
- a self-lubricating mechanism integral to said loading component; and
- a projectile biasing device that communicates with said storage component for biasing projectiles toward the breech of a pneumatic weapon.
28. A projectile storage device according to claim 27 wherein said projectile biasing device comprises a plunger and a spring.
29. A projectile storage device according to claim 27 wherein said self-lubricating mechanism comprises a lubrication portal integral with said loading component, wherein said portal is in fluid communication with said storage component and wherein said portal retains a porous plug, said plug for receiving a quantity of gun oil.
30. A method of expelling a projectile from the barrel of a pneumatic gun, said method comprising the steps of:
- placing a projectile in the breech of a pneumatic gun, said projectile being coaxial with a gun barrel;
- placing a barrier intermediate said projectile and said gun barrel;
- increasing the pneumatic pressure within said breech to a pressure sufficient to force said projectile through said barrier and out the gun barrel.
31. A method according to claim 30 wherein said barrier is a bushing that is coaxial with said gun barrel, said bushing having an inner diameter smaller than the outer diameter of the projectile.
32. A method according to claim 30 further comprising the step of providing a source of compressed gas in fluid communication with said breech.
33. A method according to claim 32 wherein the transmission of said compressed gas to said breech is controlled by an electronic circuit.
34. A method according to claim 33 wherein a portion of the gas transmitted to said breech is transmitted through the barrier and out the gun barrel where a portion of the gas is reclaimed for re-use in the pneumatic gun.
35. A method according to claim 30 in which said pneumatic gun fires projectiles in an automatic mode, a semiautomatic mode or both.
36. A method according to claim 30 wherein said gun possesses two different types of projectiles and is capable of firing either type without changing projectile storage devices or barrel.
Type: Application
Filed: Jun 3, 2011
Publication Date: May 31, 2012
Inventor: Adam M. Murray (Fayetteville, AR)
Application Number: 13/152,385
International Classification: F41B 11/06 (20060101); F41A 9/61 (20060101); F41B 11/00 (20060101);