The present disclosure relates to launching/firing systems for guns. More specifically, the disclosure relates to launching systems for air guns.
Prior art launching (or firing) systems for air guns commonly utilize electric motors and gearing to control the operation of a piston, which fires a projectile (or shot) from the barrel of the air gun. A gear catches the piston, driving it rearward and compressing a spring, such as a metal spring or an air spring. Once the spring is fully compressed, the piston can be released to compress the air in front of it and fire the shot. This arrangement has many drawbacks, such as excessive high RPM motor and gear noise, teeth breaking off gears, spring fatigue, and complexity.
Additionally, there are unavoidable heat losses due to first compressing a spring, then storing the spring energy for a period of time, then later releasing the spring to fire the shot. These heat losses add inefficiency and reduce firing velocity of the projectile for contemporary air gun launching systems.
Moreover, when a compressed spring of a prior art launching system is released, the force the spring exerts on the projectile will decrease as the spring extends in length. In some cases, the force the spring may exert on a projectile may decrease with the square of the difference of length of the spring.
Accordingly, there is a need for a launching system for an air gun that minimizes the use of electric motors and gears. Further there is a need for a launching system that does not store spring energy or compressed air energy prior to firing a shot. Additionally, there is a need for a launching system for an air gun that increases the force it applies on a projectile, as the projectile is launched.
The present disclosure offers advantages and alternatives over the prior art by providing a launching system for an air gun that does not store spring or compressed air energy. Rather the launch system launches a projectile from a barrel by a magnetically driven piston that is disposed in a cylinder. The movement of the piston within the cylinder compresses, but does not store, air in front of the moving piston. The compressed air is forced into the barrel from the cylinder and forces the projectile out of the barrel. Further, the force exerted on the piston increases as the piston moves from a reset position to a firing position. Additionally, there may be no electric motor or gears to provide unwanted high speed noise and/or broken gears.
A launching system for an air gun in accordance with one or more aspects of the present disclosure includes a compression cylinder, a piston and a drive coil assembly. The compression cylinder includes a cylinder body having an open rearward end and a closed forward end with an interior bore therebetween. The forward end has a transfer port configured for fluid communication with a barrel of an air gun. The piston includes a piston body, a sealing device and one of a ferromagnetic section or a magnet. The piston body has a forward portion disposed within the interior bore. The sealing device is disposed on the forward portion of the piston body. The one of a ferromagnetic section or magnet is disposed on a rearward portion of the piston body. The drive coil assembly is disposed over the one of a ferromagnetic section or magnet. When the drive coil assembly is energized with a first polarity, the piston is drawn from a reset position to a firing position relative to the compression cylinder by the drive coil assembly with increasing force.
Another launching system for an air gun in accordance with one or more aspects of the present disclosure includes a compression cylinder, a piston and a magnet. The compression cylinder includes a cylinder body having an open rearward end and a closed forward end with an interior bore therebetween, the forward end having a transfer port configured for fluid communication with a barrel of an air gun. The piston includes a piston body having a forward portion disposed within the interior bore. A sealing device is disposed on the forward portion of the piston body. A permanent magnet is disposed on a rearward portion of the piston body. A drive coil assembly is disposed over the permanent magnet. When the drive coil assembly is energized with a first polarity, the piston is drawn from a reset position to a firing position relative to the compression cylinder by the drive coil assembly with increasing force.
Another launching system for an air gun in accordance with one or more aspects of the present disclosure includes a compression cylinder, a piston and a drive coil assembly. The compression cylinder includes a cylinder body having an open rearward end and a closed forward end with an interior bore therebetween. The forward end has a transfer port configured for fluid communication with a barrel of an air gun. The piston includes a generally U-shaped piston body having a forward portion that is substantially parallel to a rearward portion. The forward portion is disposed within the interior bore. A sealing device is disposed on the forward portion of the piston body. A ferromagnetic section is disposed on the rearward portion of the piston body. A drive coil assembly is disposed over the ferromagnetic section. When the drive coil assembly is energized with a first polarity, the piston is drawn from a reset position to a firing position relative to the compression cylinder by the drive coil assembly with increasing force.
It should be appreciated that all combinations of the foregoing concepts and additional concepts discussed in greater detail below (provided such concepts are not mutually inconsistent) are contemplated as being part of the inventive subject matter disclosed herein and may be used to achieve the benefits and advantages described herein.
The disclosure will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
Certain examples will now be described to provide an overall understanding of the principles of the structure, function, manufacture, and use of the methods, systems, and devices disclosed herein. One or more examples are illustrated in the accompanying drawings. Those skilled in the art will understand that the methods, systems, and devices specifically described herein and illustrated in the accompanying drawings are non-limiting examples and that the scope of the present disclosure is defined solely by the claims. The features illustrated or described in connection with one example may be combined with the features of other examples. Such modifications and variations are intended to be included within the scope of the present disclosure.
The terms “significantly”, “substantially”, “approximately”, “about”, “relatively,” or other such similar terms that may be used throughout this disclosure, including the claims, are used to describe and account for small fluctuations, such as due to variations in processing from a reference or parameter. Such small fluctuations include a zero fluctuation from the reference or parameter as well. For example, they can refer to less than or equal to ±10%, such as less than or equal to ±5%, such as less than or equal to ±2%, such as less than or equal to ±1%, such as less than or equal to ±0.5%, such as less than or equal to ±0.2%, such as less than or equal to ±0.1%, such as less than or equal to ±0.05%.
Referring to
Referring to
The system 100 is designed to interface with existing systems of loading. That is, everything ahead of (or forward of) the compression cylinder 102 is standardized parts. So, for example, the barrel 110 of the air gun, the ammunition 112 of the air gun and all other air gun components that are forward of the compression cylinder 102 may be standardized parts. The ammunition may be, for example, BBs or pellets (such as airsoft plastic pellets).
The piston 104 includes a piston body 124 having a forward portion 126 and a rearward portion 128. All or part of the forward portion 126 of piston body 124 may be disposed within the interior bore 120 of the compression cylinder 102. A sealing device 130 is disposed on the forward portion 126 of the piston body 124 proximate the distal end of the forward portion 126. The sealing device may be an O-ring seal, a parachute seal or the like, which is operable to provide an slidable air seal between the bore 120 of the compression cylinder 102 and the piston body 124 of the piston 104.
The piston 104 also includes one of a ferromagnetic section or a magnet 132 that is disposed on the rearward portion 128 of the piston body 124. The one of a ferromagnetic section or a magnet 132 may be disposed on or proximate the distal end of the rearward portion 128 of the piston body 124.
The one of a ferromagnetic section or a magnet 132 may be either a ferromagnetic section 132A or a magnet 132B. If it is a ferromagnetic section 132A, then that section 132A may be composed of such ferromagnetic material as iron or steel.
If the one of a ferromagnetic section or a magnet 132 is a magnet 132B, then that magnet 132B may be an electromagnet 132A that is commutated. That is the electromagnet 132B, may include a series of metal bars or segments that are insulated from each other and can provide a sliding connection to a magnetizing current source as the piston 104 moves.
Also, if the one of a ferromagnetic section or a magnet 132 is a magnet 132B, that that magnet 123B may be a permanent magnet 132B. More specifically, the magnet 132B may be a rare earth magnet, such as a neodymium magnet or a samarium-cobalt magnet.
Referring to
The reset-push coil assembly 108 is disposed proximate the permanent magnet 132B, when the piston 104 is in the reset position 134. The reset-push coil assembly 108 includes an outer wire coil 138 (such as copper wire or aluminum wire) that is wound over an inner ferromagnetic core 140. The ferromagnetic core 140 may be composed of various ferromagnetic materials, such as iron or steel. Additionally, the outer wire coil 138 may be wound directly over a spool 142. The spool 142 of the reset-push coil assembly 108 may have a spool bore 144 that is sized to receive the ferromagnetic core 140 therethrough.
When the reset-push coil assembly 108 is energized with a first polarity, the permanent magnet 132B is attracted to the reset-push coil assembly 108 and the piston 104 is drawn from the firing position 135 to the reset position 134. By drawing the piston 104 back into the reset position 134, air 136 is drawn into the bore 120 of the compression cylinder 102 through the gun barrel 110 and the transfer port 132.
Referring to
As the piston 104 is driven forward, it compresses the air 136 and builds up air pressure. Once the air pressure overcomes the frictional forces of the barrel 110 on the projectile 112 and also overcomes the inertia of the projectile (ammunition), the projectile 112 may be fired (i.e., launched) through the barrel 110 of the air gun.
Referring to
The drive coil assembly 106 includes an outer wire coil 148 (such as copper or aluminum wire) that is wound around a drive coil spool 150. The drive coil spool 150 includes a spool bore 152 that is sized to slidably receive the piston 104 therethrough. The spool 150 may be composed of a plastic or other non-magnetic material to reduce magnetic reluctance that could be introduced during operation of the launching system 100. Even non-ferrous metals, such as aluminum or copper may introduce an undesirable amount of reluctance into the system 100 during operation.
The drive coil assembly 106 may be a single stage coil or multiple stage coil. The multiple stage coil may be utilized for such purposes as to increase the power output of the launching system 100.
During operation, the reset-push coil assembly 108 may be energized with it second polarity and the drive coil assembly 106 may be simultaneously energized with its first polarity. As such, the permanent magnet 132B is repelled from the reset-push coil assembly 108 and the piston 104 is driven from the reset position 134 (
Advantageously, the drive coil assembly 106 and the reset-push coil assembly 108 provide a two stage thrust on the piston 104. That is, the reset-push coil assembly's 108 initially applied force on the piston 104 is the strongest at the reset position 134, while the drive coil assembly's 106 initially applied force on the piston 104 is weakest at the reset position 134. However, as the piston 104 is driven toward its firing position 135, the force applied by the drive coil assembly 106 increases while the force applied by the reset-push coil assembly decreases. As the piston 104 is driven forward in the compression cylinder 104, the air 136 is compressed. Once the air pressure overcomes the frictional forces between the barrel 110 and projectile 112, and overcomes the inertia of the projectile 112, the projectile 112 will launch.
This unique combination of forces applied by the reset-push coil assembly 108 and drive coil assembly 106 of launching system 100 advantageously enables a greater average force to be applied to driving the piston 104 forward from reset position 134 to firing position 135 than prior art launching systems. Additionally, because there is no storage of compression energy (such as when a metal spring or air spring is compressed and held for a fixed period of time), there is less heat loss associated with the launching system 100 compared to prior art launching system and, therefore, the launching system 100 is inherently more efficient than prior art launching systems.
Once the projectile has been launched, the reset-push coil assembly 108 may be energized with its first polarity and the drive coil assembly 106 may be simultaneously deenergized. Accordingly, the permanent magnet 132B is attracted to the reset-push coil assembly 108 and the piston 10 is drawn from the firing position 135 to the reset position 134. The drive coil assembly 106 may provide substantially zero force upon the permanent magnet 132B as the piston 104 is drawn from the firing position 135 to the reset position 134.
Referring to
Referring to
The launching system 200 includes a compression cylinder 102, a generally U-shaped piston 104 and a drive coil assembly 106. The compression cylinder 102 includes a cylindrical body 114 having an open rearward end 116 and a closed forward end 118 with an interior bore 120 therebetween. The bore 120 is sized to receive the piston 104 therein. The forward end 118 includes a transfer port 122 that is configured for fluid communication with the barrel 110 of the air gun. In other words, the transfer port 122 extends entirely through the closed forward end 118 such that air may flow from the barrel 110 of the air gun to the interior bore 120 of the compression cylinder 102 and vice versa. The compression cylinder 102 may be composed of a non-ferrous metal, such as aluminum or copper, to reduce the amount of reluctance that may be introduced during operation of the launching system 100.
The system 200 is designed to interface with existing systems of loading. That is, everything ahead of (or forward of) the compression cylinder 102 is standardized parts. So, for example, the barrel 110 of the air gun, the ammunition 112 of the air gun and all other air gun components that are forward of the compression cylinder 102 may be standardized parts. The ammunition may be, for example, BBs or pellets (such as airsoft plastic pellets).
The piston 204 includes a generally U-shaped piston body 206 having a forward portion 208 that is substantially parallel to a rearward portion 210. All or part of the forward portion 208 of the piston body 206 may be disposed within the interior bore 120 of the compression cylinder 102.
A sealing device 130 is disposed on the forward portion 208 of the piston body 206 proximate the distal end of the forward portion 208. The sealing device may be an O-ring seal, a parachute seal or the like, which is operable to provide a slidable air seal between the bore 120 of the compression cylinder 102 and the piston body 206 of the piston 204.
The piston 104 also includes one of a ferromagnetic section or a magnet 132 that is disposed on the rearward portion 210 of the piston body 206. The one of a ferromagnetic section or a magnet 132 may be either a ferromagnetic section 132A or a magnet 132B. In the case illustrated in
When the piston 204 is moved from the firing position 214 to the reset position 212, as illustrated in
More specifically, when the drive coil assembly 106 is energized, the ferromagnetic section 132A of the rearward portion 210 is simultaneously drawn toward the center of the drive coil assembly 106 and the piston 204 is drawn from the reset position 212 to the firing position 214 with a force provided by the drive coil assembly 106 that increases as the distance between the center of the drive coil assembly 106 and the ferromagnetic section 132A decreases. As the piston 204 is driven forward in the compression cylinder 104, the air 136 is compressed. Once the air pressure overcomes the frictional forces between the barrel 110 and projectile 112, and overcomes the inertia of the projectile 112, the projectile 112 will launch.
The increasing force applied by the drive coil assembly 106 to the piston 204 as the piston 204 moves from the reset position 212 to the firing position 214, advantageously enables a greater average force to be applied to driving the piston 204 forward than prior art launching systems. Additionally, because there is no storage of compression energy (such as when a metal spring or air spring is compressed and held for a fixed period of time), there is less heat loss associated with the launching system 200 compared to prior art launching system and, therefore, the launching system 200 is inherently more efficient than prior art launching systems.
In order to reset the piston 204 of launch system 200 (i.e., move the piston 204 from its firing position 214 to its reset position 212), a spring 216 is disposed on the distal end 218 of the rearward portion 210 of the piston body 206. When the drive coil assembly 106 is energized with its first polarity, the piston 204 is drawn from the reset position 212 to the firing position 214, which compresses the spring 216. When the drive coil assembly 106 is deenergized, the spring 216 is operable to extend, which drives the piston 204 from its firing position 214 to its reset position 212.
Though a spring 216 is used to reset the piston 204, other devices and systems may also be used. For example, the piston 204 may be reset by hand. Also, a permanent magnet 132B, rather than a ferromagnetic section 132A may be used instead. In that case, if the drive coil assembly 106 is energized in its second polarity, the drive coil assembly 106 will drive the permanent magnet 132B out of the drive coil assembly 106 and drive the piston 204 toward its reset position 212.
It should be appreciated that all combinations of the foregoing concepts and additional concepts discussed in greater detail herein (provided such concepts are not mutually inconsistent) are contemplated as being part of the inventive subject matter disclosed herein. In particular, all combinations of claimed subject matter appearing at the end of this disclosure are contemplated as being part of the inventive subject matter disclosed herein.
Although the invention has been described by reference to specific examples, it should be understood that numerous changes may be made within the spirit and scope of the inventive concepts described. Accordingly, it is intended that the disclosure not be limited to the described examples, but that it have the full scope defined by the language of the following claims.
This application is a non-provisional of, and claims the benefit of the filing date of, U.S. provisional application 63/262,461, filed Oct. 13, 2021, entitled, “LAUNCHING SYSTEM FOR AN AIR GUN,” the contents of which are incorporated herein by reference.
Number | Date | Country | |
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63262461 | Oct 2021 | US |