Abstract:
A compressed gas gun with a cocking mechanism that provides a mechanical advantage in compressing a mainspring, while providing a two stage loading and cocking action that accesses and seals a breech through utilization of an intermediate cocking member.

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to compressed gas guns. More particularly, the present invention relates to compressed gas guns that employ a cocking mechanism, which yields a mechanical advantage for the compression of a main spring. 
     Description of the Related Art 
     Compressed gas guns operate to release a quantity of compressed gas into the breech of a barrel, which has been pre-loaded with a projectile, thereby propelling the projectile out of the barrel at high velocity. In practice, such a gun must provide a source of compressed gas in order to function. Typically, this source of gas is an air tank that is pre-charged prior to being coupled with the gun, or a fixed tank that is charged in place while coupled to the gun. As such, these are referred to as pneumatic pre-charged (PCP) guns. In either case, the tank holds a finite quantity of compressed gas. Upon discharging the gun one or more times, the reserve of compressed gas is ultimately depleted and must be replenished. Air is used as the compressed gas in the majority of PCP guns, but other suitable gases can be employed as well. 
     In the case of a manually loaded compressed gas gun, the breech of the barrel must be accessible for manual insertion of a projectile into the breech of the barrel. It is desirable to provide a readily accessible breech, which can be conveniently loaded by the fingers of the user. In the case of an auto-loading gun, the breech still must be accessible to the loading mechanism, yet sealable so as to coupled the compressed gas to the breech without undue gas leakage. 
     A valve mechanism is commonly provided which acts to discharge a quantity of compressed gas as a result of actuation of a trigger mechanism. However, prior to discharging the gun, the valve assembly must be coupled to the breech of the barrel in order to seal the gas port between the tank and the breech of the barrel. It is desirable to provide a pressure-tight seal, which serves to conserve the amount of gas consumed upon discharging the gun and also to conserve the pressure of the gas so as to maximize the amount of energy transferred from the compressed gas to the projectile. Furthermore, a tight gas seal reduces the sound level of the gun upon discharging, which is desirable in compressed gas guns. 
     The inventor of the present disclosure has been granted two prior patents, which are U.S. Pat. No. 5,586,545 issued on Dec. 24, 1996 for COMPRESSED GAS GUN, and U.S. Pat. No. 5,813,392 issued on Sep. 29, 1998 for COMPRESSED GAS GUN, which together disclose several embodiments of compressed gas guns. The entire disclosures of these two patents are hereby incorporated by reference. A review of those patents will reveal that the loading, cocking, and discharging mechanisms, collectively referred to as the operating assembly, incorporate a hammer and a mainspring where the compressed energy of the mainspring drives the hammer rearward in the receiver, and this energy is ultimately driven against a pneumatic valve to release a surge of compressed gas into the breech of a barrel to discharge the gun. It will also be noted that these designs were intended for lighter caliber projectiles, generally ranging from 0.17 inch to 0.25 inch calibers. The force of the main spring, weight of the hammer, and pneumatic valve actuation force are all related to the caliber and mass of the projectile. Since the forces required for lighter calibers are reasonable with respect to the force an operator must exert to compress the main spring, these prior design utilized a cocking lever that was directly coupled to the mechanism such that actuation of the cocking lever opened the breech seal, moved the hammer forward, and compressed the main spring in preparation of a subsequent discharge of the gun. 
     A growing trend in compressed gas guns is toward heavier caliber projectiles. Today, 0.30 inch caliber guns are known, and recently 0.45 inch caliber guns are entering the market. While the prior loading, cocking, and discharging mechanisms have performed well with lighter caliber guns, the higher forces required to discharge heavier calibers has correspondingly increased mainspring compressive forces, and the size and weight of related components, such that the operator applied cocking forces have become challenging for some operators. Thus it can be appreciated that there is a need in the art for a compressed gas gun that functions with heavier calibers, yet is manageable to operate. 
     SUMMARY OF THE INVENTION 
     The need in the art is addressed by the apparatuses of the present invention. The present disclosure teaches a compressed gas gun for discharging a projectile. In an illustrative embodiment, the compressed gas gun includes a barrel with a muzzle and breech, which is fixed to a receiver that supports a cocking pawl and a gas valve located adjacent to the breech. A cocking member slides in parallel with the barrel, and has a spring stop fixed thereto. A cocking lever is rotatably coupled to the receiver at a first end and coupled to the cocking member by a cocking link, and provides a mechanical advantage in sliding the cocking member. Opposing directions of rotation of the cocking lever urge the cocking member towards the muzzle or toward the breech. A breech seal slides together with the cocking member, and seals to the barrel adjacent to the breech. A hammer and a main spring are located between the breech seal and the spring stop. Rotation of the cocking lever to urge the cocking member toward the muzzle slides the breech seal away from the gas valve to facilitate insertion of the projectile into the breech, and also urges the hammer to engage the cocking pawl, thereby retaining the hammer. Further, rotation of the cocking lever to urge the cocking member toward the breech compresses the main spring between the hammer and the spring stop, and further slides the breech seal to seal to engage the gas valve. Actuation of the cocking pawl releases the hammer, which is driven by the main spring to impact the breech seal, which impacts the gas valve to release compressed gas and discharge the projectile from the muzzle. 
     In a specific embodiment, the foregoing apparatus further includes a trigger assembly coupled to the cocking pawl, which is disabled from releasing the cocking pawl unless the cocking member has been urged toward the breech to sealably engage the breech seal with the gas valve. 
     In a specific embodiment of the foregoing apparatus, the breech seal is slidably coupled to the cocking member, and further includes a seal spring disposed between the cocking member and the breech seal, which urges the breech seal against the gas valve. In a refinement to this embodiment, an elastomeric seal is placed between the breech seal and the gas valve. 
     In a specific embodiment of the foregoing apparatus, the spring stop position with respect to the cocking tube is adjustable, which enables adjustment of the main spring compression. 
     In a specific embodiment, the foregoing apparatus further includes a magnet disposed on the receiver, and the cocking lever is held in place by the magnet while the cocking member is urged toward the breech. 
     In another specific embodiment of the foregoing apparatus, the cocking member has a tubular form and is positioned concentric with the barrel. In a refinement to this embodiment, the hammer has a tubular form and is positioned to slide along the barrel exterior and the cocking member interior together with the main spring. In another specific embodiment, the breech seal has a substantially tubular form with a cylindrical interior that is sealed to the barrel with an elastomeric seal. 
     The present disclosure also teaches a compressed gas gun apparatus for discharging a projectile, which includes a barrel with a muzzle and a breech that is fixed to a receiver that has a breech opening adjacent to the breech. A gas valve is located adjacent to the breech opening and aligned with the barrel. A trigger with a cocking pawl is fixed to the receiver. A cocking member slides in parallel with the barrel, and has a spring stop fixed thereto. A cocking lever is rotatably coupled to the receiver at a first end and is coupled to the cocking member by a cocking link to provide a mechanical advantage to slide the cocking member. Opposing directions of rotation of the cocking lever selectively urges the cocking member towards the muzzle or toward the breech. A breech seal slides together with the cocking member, and sealably engages the barrel adjacent to the breech. A hammer and a main spring are located between the breech seal and the spring stop. Urging the cocking member toward the muzzle slides the breech seal away from the gas valve and exposes the breech within the breech opening, to facilitate insertion of the projectile into the breech, and also slides the hammer toward the muzzle to engage the cocking pawl and retain the hammer. Urging the cocking member toward the breech compresses the main spring between the hammer and the spring stop, and also slides the breech seal to seal the gas valve. Actuation of the trigger releases the hammer from the cocking pawl, which is driven by the main spring to impact the breech seal to further impact the gas valve, to thereby release compressed gas and discharge the projectile from the muzzle. 
     In a specific embodiment of the foregoing apparatus, the trigger assembly is disabled from releasing the cocking pawl unless the cocking member has been urged toward the breech to seal the breech seal with the gas valve. 
     In a specific embodiment of the foregoing apparatus, the breech seal is slidably coupled to the cocking member, and the apparatus further includes a seal spring between the cocking member and the breech seal, which urges the breech seal against the gas valve. 
     In a specific embodiment of the foregoing apparatus, the spring stop position with respect to the cocking tube is adjustable, which enables adjustment of compression of the main spring. 
     In a specific embodiment, the foregoing apparatus further includes a magnet disposed on the receiver, and the cocking lever location while the cocking member is urged toward the breech is maintained by magnetic attraction. 
     In a specific embodiment of the foregoing apparatus, the cocking member has a tubular form and is positioned concentric with the barrel. In a refinement to this embodiment, the hammer has a tubular form and is positioned to slide along the barrel exterior and the cocking member interior together with the main spring. 
     In a specific embodiment of the foregoing apparatus, the breech seal has a substantially tubular form with a cylindrical interior that is sealed to the barrel with an elastomeric seal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view drawing of an air gun according to an illustrative embodiment of the present invention. 
         FIG. 2  is a perspective view drawing of an air gun with a breech seal in a closed position according to an illustrative embodiment of the present invention. 
         FIG. 3  is a perspective view drawing of an air gun with a breech seal in an open position according to an illustrative embodiment of the present invention. 
         FIG. 4  is a section view drawing of an air gun according to an illustrative embodiment of the present invention. 
         FIG. 5  is a detailed section view drawing of an air gun according to an illustrative embodiment of the present invention. 
         FIG. 6  is a detailed section view drawing of an air gun according to an illustrative embodiment of the present invention. 
         FIG. 7  is a cross section view drawing of an air gun according to an illustrative embodiment of the present invention. 
         FIGS. 8A, 8B, 8C, and 8D  are a bottom view drawing, an end view drawing, a right side view drawing, and a left side view drawing, respectively, of an air gun cocking tube according to an illustrative embodiment of the present invention. 
         FIGS. 9A and 9B  are a side view drawing and an end view drawing, respectively, of an air gun spring stop according to an illustrative embodiment of the present invention. 
         FIG. 10  is drawing of an air gun main spring according to an illustrative embodiment of the present invention. 
         FIGS. 11A and 11B  are a side view drawing and an end view drawing, respectively, of an air gun hammer according to an illustrative embodiment of the present invention. 
         FIG. 12  is a drawing of an air gun breech seal spring according to an illustrative embodiment of the present invention. 
         FIGS. 13A, 13B, and 13C  are a side view drawing, a breech end view drawing, and a muzzle end view drawing, respectively, of an air gun breech seal according to an illustrative embodiment of the present invention. 
         FIGS. 14A, 14B, and 14C  are section view drawings of an air gun in the loading position, cocked position, and fired position, respectively, according to an illustrative embodiment of the present invention. 
     
    
    
     DESCRIPTION OF THE INVENTION 
     Illustrative embodiments and exemplary applications will now be described with reference to the accompanying drawings to disclose the advantageous teachings of the present invention. 
     While the present invention is described herein with reference to illustrative embodiments for particular applications, it should be understood that the invention is not limited thereto. Those having ordinary skill in the art and access to the teachings provided herein will recognize additional modifications, applications, and embodiments within the scope hereof and additional fields in which the present invention would be of significant utility. 
     In considering the detailed embodiments of the present invention, it will be observed that the present invention resides primarily in combinations of steps to accomplish various methods or components to form various apparatus and systems. Accordingly, the apparatus and system components and method steps have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the present invention so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the disclosures contained herein. 
     In this disclosure, relational terms such as first and second, top and bottom, upper and lower, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms “comprises,” “comprising,” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by “comprises a” does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. 
     As was discussed in the Background section of this disclosure, the inventor hereof has been granted two prior art US patents, U.S. Pat. No. 5,586,545 issued on Dec. 24, 1996 for COMPRESSED GAS GUN, and U.S. Pat. No. 5,813,392 issued on Sep. 29, 1998 for COMPRESSED GAS GUN. These patents disclose compressed gas guns that employ loading, cocking and discharging mechanisms that perform well with light caliber projectiles, typically ranging from 0.17 inch to 0.25 inch calibers. In use, the operator of the gun follows a sequence of steps to load and discharge the gun, which generally proceeds as follows. Beginning from the condition where the gun as previously been discharged, the operator grasps a cocking handle and pushes a breech seal forward toward the muzzle, which exposes the breech end of barrel and pushes a hammer forward to compress a main spring until a cocking pawl engages the hammer in cocked position. Next, the operator inserts a projectile into breech end of barrel, and then pushes the breech seal rearward toward the breech end of the gun while the cocking pawl retains the hammer in the cocked position. The breech seal seals a gas release valve to the breech of barrel. Finally, the operator pulls a trigger, which releases the cocking pawl to allow the main spring to drive hammer rearward to impact the breech seal, which in-turn impacts the air release valve expelling air into the breech seal and barrel breech, thereby driving the projectile out of the muzzle of the barrel. Note that this configuration requires the operator to directly compress the main spring with the cocking handle. 
     The present disclosure provides novel loading, cocking, and discharging mechanisms for compressed gas guns that are particularly suitable for heavier calibers, although they are quite suitable for light calibers as well. According to certain illustrative embodiments of the present disclosure, the gun mechanism enables the operator to more easily and conveniently operate the compressed gas gun. In one embodiment, the operator grasps a cocking lever and pulls it away from the gun&#39;s receiver, which pushes an internal cocking tube forward toward the muzzle that also carries a breech seal and hammer forward to engage a cocking pawl of a trigger mechanism. Then, the operator closes the cocking lever and that pushes the cocking tube and breech seal rearward while the cocking pawl holds the hammer in forward position such that main string is compressed between a spring stop in cocking tube and the cocking pawl in trigger mechanism. The trigger is pulled to release cocking pawl, thereby allowing the hammer to be driven rearward into the breech seal, actuating an air valve and discharging a projectile. Another embodiment follows this sequence of events, which also begins with the gun in a previously discharged condition. The operator rotates a cocking lever that moves a cocking member within the gun&#39;s receiver. This action opens a breech seal to expose the barrel breech, and also urges a hammer and main spring forward until a coking pawl engages the hammer in forward position. The operator then inserts a projectile into breech end of barrel. Then, the operator rotates the cocking lever in the opposite direction to move the cocking tube rearward, which compresses the spring between a spring stop on the cocking member and a cocking pawl, and this action also closes that breech seal to seal an air release valve with barrel breech. Finally, the operator pulls a trigger to release the cocking pawl, which allows the main spring to drive hammer rearward to impact breech seal, which in-turn impacts the air release valve expelling air into the breech seal and barrel breech, thereby driving the projectile out of barrel and muzzle. 
     Reference is directed to  FIG. 1 , which is a perspective view drawing of a compressed gas gun  2  according to an illustrative embodiment of the present invention. The gun  2  is built about a receiver  4 , which is an aluminum extrusion that is further machined in the illustrative embodiment. A barrel  18  is fixed to the receiver  4  with its muzzle  19  at the forward end of the gun  2 . A pistol grip  10  and fore stock  12  are attached to the receiver  4  and are provided for operator convenience. A compressed gas cylinder  6  provides the energy source for the gun  2 , and also functions as a shoulder stock, and further includes shoulder rest  8 , also for operator convenience. A gas fill port  20  is provided so that the compressed gas cylinder can be refilled without disconnecting it from the receiver  4 . A breech opening  14  is cut into the receiver, which provides operator access to the barrel breech (not shown) to facilitate loading of projectiles (not shown). A cocking lever  16  is rotatably connected to the receiver  4 , and is also connected to a cocking link  24 , which engages a cocking member (not shown) inside the receiver  4  through a cocking slot  26 . The cocking lever  16 , cocking link  24 , and the cocking member (not shown) operate cooperatively to yield a mechanical advantage for the operator. A mechanical advantage is a measure of the force amplification achieved by using the cocking mechanism as a system. The cocking mechanism preserves the input power and trades off forces against movement to obtain a desired amplification in the output force. This is essentially the law of the lever, as will be appreciated by those skilled in the art. Machine components designed to manage forces and movement in this way are called mechanisms. 
     Reference is directed to  FIG. 2  and  FIG. 3 , which are partial perspective view drawings of a compressed gas gun with a breech seal in a closed position and opened position, respectively, according to an illustrative embodiment of the present invention.  FIG. 2  corresponds to  FIG. 1 , but provides a closer view to facilitate the presentation of further details. Note that the receiver  4 , pistol grip  10 , fore stock  12  and gas cylinder  6  are presented.  FIG. 2  presents a breech seal  30  in the closed position, and engaged with a gas valve  32 . The breech seal  30  slides together with a cocking member  34 , which is partially visible within the breech opening  14  in this condition. Note that the cocking handle  16  is positioned close to the receiver  4 , which is a convenient location for carrying, discharging, and storing the gun. The cocking handle  16  is maintained in the closed position using a magnet (not shown) that is fixed to the receiver. The cocking link  24  is also held close to the receiver  4 . The cocking link  24  engages a cocking member (not shown) through a cocking slot  26  formed in the receiver  4 . The cocking handle  16  is rotatably coupled to the receiver  4  using a pivot mount  28 . 
       FIG. 3  corresponds with  FIG. 2 , however  FIG. 3  presents the gun with the cocking lever  16  rotated forward so as to urge the cocking member (not shown) and breech seal  30  toward the muzzle (not shown) to thereby expose the barrel breech  22  within the breech opening  14 . The gas valve  32  is also more clearly visible in this condition. Note that the magnet  15  is fixed to the pivot mount  28 , which serves to hold the cocking lever  16  in place against the receiver  4 , as illustrated in  FIG. 2 . The cocking link  24  follows the cocking lever  16  as it is rotated toward the muzzle end the gun, and the distal end slides within the cocking slot  26  to advance the cocking member (not shown) inside the receiver  4 . In the condition illustrated in  FIG. 3 , the operator has access to the breech  22  for insertion of a projectile. Note that the breech end  22  of the barrel is cut-away so that a projectile may rest thereupon as it is inserted into the breech  22 . The projectile need not be fully inserted into the breech, rather just sufficiently to enable the compressed gas to force it into the barrel upon discharging the gun. Once a projectile is inserted, the operator rotates the charging handle  16  toward the breech end of the gun to return the gun to the same condition illustrate in  FIG. 2 . Further operations of the mechanisms will be more fully discussed hereinafter. 
     Reference is directed to  FIG. 4 , which is a section view drawing of a compressed gas gun  2  according to an illustrative embodiment of the present invention. This view is a section taken through the centerline of an illustrative embodiment compressed gas gun  2 , and serves to further orient the viewer with respect to other drawing figures and descriptive materials. The receiver  4  is an aluminum extrusion that is further machined to accommodate the various other components of the gun. The barrel  18  is fixed to the receiver  4 . A breech opening  14  is formed into the receiver  4  to provided access to the breech  22  of the barrel. The pistol grip  10  and fore stock  12  are presented. The compressed gas cylinder  6  and shoulder stock  8  are also presented. The gas valve  32  is fixed to the gas cylinder  6  for expelling compressed gas into the breech  22  of the barrel  18 . Note that a trigger assembly  48  is disposed in the lower portion of the receiver  4 . The trigger assembly  48  includes a safety function in addition to the triggering function. 
     Reference is directed to  FIG. 5 , which is a detailed section view drawing of a compressed gas gun according to an illustrative embodiment of the present invention.  FIG. 4  corresponds with  FIG. 5  and is also a section view along the centerline, but is a closer view to reveal further details. In  FIG. 4 , the receiver  4 , barrel  18 , fore stock  12 , pistol grip  10 , and gas cylinder  6  are again presented. The gas valve  32  is fixed to the gas cylinder, and couples from the interior of the gas cylinder to a location within the breech opening  14 , and is aligned with the breech  22  of the barrel  18 , but spaced away so that there is sufficient space available to insert a projectile (not shown) into the breech  22 . A number of components are located in the annual gap between the exterior of the barrel  18  and the interior of the receiver  4 . Among these are, the cocking member  34 , the breech seal  30 , the breech spring  44 , the hammer  42 , and the main spring  40 . All of these items are of cylindrical form and concentric with one another in the illustrative embodiment. This facilitates mutual support and location of these various components, and also yields a compact and lightweight design. However, the cylindrical and concentric arrangement is not required to implement a gun under the teachings of the present disclosure. Other configurations could be employed, and it is not required for all these components to be located within the receiver. For example, the hammer could be a pivoting member driven by a leaf spring, and the cocking member could be a bar located parallel to the barrel and outside of the receiver. 
     Continuing in  FIG. 5 , the trigger assembly  48 , which is located in a lower recess of the receiver  4 , further includes a trigger actuator  44  and a safety actuator  46  for implementing the convention functions of discharging the gun and interlocking against the discharge of the gun. A cocking pawl  43  engages the hammer  42  to retain the hammer  42  in position against the compressive force of the main spring  40  while the gun is cocked. When the trigger  44  is pressed, the cocking pawl  43  moves downward and releases the hammer  42  to be driven rearward toward the breech end of the gun by the main spring  40 . The hammer  42  accelerates and impacts the breech seal  30 , which functions as an energy communicating member to impact the gas valve  32  to release a pulse of compressed gas. The breech seal  30  sealably engages both the gas valve  32  and the barrel  18  so as to coupled the compressed gas energy to the barrel  18 , rather than leaking away. Although, a small amount of leakage away from the intended pneumatic path is not problematic. Note that the cocking member  34 , which is tubular in this embodiment, serves the function of carrying the moving components toward the muzzle or toward the breech as the cocking mechanism (not shown) is actuated. The moving members include the breech seal  30 , the seal spring  44 , the hammer  42 , and the main spring  40 , among certain other components that will be discussed hereinafter. 
     Reference is directed to  FIG. 6 , which is a detailed section view drawing of a compressed gas gun according to an illustrative embodiment of the present invention. This view of the illustrative embodiment gun  2  is presented with several of the internal components removed so that the location and arrangement of others is more readily discernable. The receiver  4  supports the barrel  18  in a fixed relationship. Note that the barrel is supported from the receiver  4  near the muzzle end using concentric collars (not shown) and sets screws (not shown), although other support arrangements could be employed. The fixed relationship is useful for aiming and accuracy of the gun  2  since the sights or scope are fixed to the receiver  4 . The compressed gas cylinder  6  is fixed to the receiver  4  and presents the gas valve  32  in the breech opening  14  of the receiver  4 . Note that an annular groove  33  is provided in the gas valve  32  for retaining an O-ring (not shown), which provides an elastomeric seal with the breech seal (not shown) when the two are sealably engaged. The gas valve  32  is concentrically aligned with the barrel  18  so that the breech seal (not shown) may slidable and sealably engage both of the barrel  18  and gas valve  32 . The barrel breech  22  is visible in  FIG. 6 , and note the cut-away barrel extension  23  that extends rearward toward the gas valve  32 . This extension  23  provides a trough into which the operator can rest a projectile (not shown) as it is pressed into the breech  22 . 
     Another significant aspect of the illustrative embodiment of  FIG. 6  is the location of the cocking slot  26  in the receiver  4 . In this view, the cocking slot  26  is illustrated by phantom line because it is physically located on the portion of the receiver  4  removed for this section view. However, the position is correct with respect to the receiver  4  and cocking member  34 . Also note the two mounting holes  36  that of formed in the cocking member  34  for engaging the cocking link (not shown) through the cocking slot  26 . The mount holes  36  are illustrated in phantom line for the same reason. The cocking member  34  is tubular in this embodiment and it is enabled to slide fore and aft in the direction of the muzzle or breech ends of the barrel  18  as allowed by the length of the cocking slot  26  and urged by the cocking link (not shown). In this view, the cocking member  34  is illustrated at mid-travel between the two extremes. Note also the location of the cocking pawl  43 , which passes through suitable apertures formed in both the receiver  4  and cocking member  34 . The cocking pawl  43  is illustrated without the remaining components of the trigger assembly for the sake clarity. 
     Reference is directed to  FIG. 7 , which is a cross section view drawing of a compressed gas gun according to an illustrative embodiment of the present invention. This section view labeled “A-A” is taken from  FIG. 6 , at the location illustrated. In  FIG. 7 , the receiver  4  extrusion profile is visible with the barrel  18  at the center of the receiver  4 . The cocking member  34  slides along the interior of the receiver  4 , which serves as a guide for the sliding action. The cocking pawl  43  extends upwardly into the interior of the receiver  4  thought a suitable hole  5  in the receiver  4 , and further through a suitable slot  52  in the cocking member  34 . In this manner, the cocking pawl may be positioned within the interior of the cocking member  34  even thought the cocking member is slid for and aft. The annular space between the exterior of the barrel  18  and the interior of the cocking member  34  is provided to accommodate the breech seal (not shown), hammer (not shown) and the main spring (not shown). 
     Reference is directed to  FIGS. 8A, 8B, 8C, and 8D , which are a bottom view drawing, an end view drawing, a right side view drawing, and a left side view drawing, respectively, of a compressed gas gun cocking member  34  according to an illustrative embodiment of the present invention. The cocking member  34  is in the form of a tube in this embodiment, which is open at both ends and slides along the interior of the receiver (not shown). The cocking member  34  has a slot  52  formed along its bottom, which provides access for the cocking pawl (not shown) to reach into its interior and engage the hammer (not shown). The cocking member includes a pair of opposing slots  54  on either side, and adjacent to the breech end, to facilitate connection of the breech seal (not shown). The cocking member  34  further includes a pair of mounting holes  36  on one side for connecting the cocking link (not shown), which drives the cocking member fore and aft during cycling of the gun. The interior of the muzzle end of the cocking member  34  is threaded  58  to engage and retain the spring stop (not shown). A spring stop adjustment port  50  is provided so that the spring stop (not shown) may be rotated to adjust its position, and thereby change the degree to which the main spring (not shown) is compressed during the cocking operation. The receiver  4  (not shown) has a corresponding spring stop adjustment opening for access by the operator. 
     Reference is directed to  FIGS. 9A and 9B , which are a side view drawing and an end view drawing, respectively, of a compressed gas gun spring stop  38  according to an illustrative embodiment of the present invention. Generally speaking, the spring stop is a fitment coupled to the cocking member, which engages the mainspring. The main spring is compressed between the spring stop and the hammer as the gun is cocked. The hammer is, in turn, retained by the cocking pawl. Thusly, release of the cocking pawl releases the hammer, which is accelerated under force of the mainspring. The cocking action is effected by the urging the cocking member against the main spring. The spring stop  38  of the illustrative embodiment in  FIGS. 9A and 9B  is generally tubular with exterior threads  41  to engage the corresponding threads in the cocking member (not shown). A series of holes  39  are formed around the circumference of the spring stop  38 . These holes  39  are presented within the aforementioned spring stop adjustment ports (not shown) on the receiver (not shown) and cocking member (not shown). A suitable tool (not shown) can be used to engage the holes  39  to incrementally rotate the spring stop  38  on its threads  41  to vary its position with respect to the cocking member (not shown). 
     Reference is directed to  FIG. 10 , which is drawing of a compressed gas gun main spring  40  according to an illustrative embodiment of the present invention. The main spring configuration is a coiled spring with tubular form that is specified according to the diameter, length, compressive force, and dimensions required for the gun caliber, hammer weight, and travel required, as will be appreciated by those skilled in the art. Other spring configurations can also be adapted to the teachings of the present invention. 
     Reference is directed to  FIGS. 11A and 11B , which are a side view drawing and an end view drawing, respectively, of a compressed gas gun hammer  42  according to an illustrative embodiment of the present invention. The hammer  42  of the illustrative embodiment is tubular in form having a length, diameter, and weight required for the physical configuration of the cocking assembly and driving force required for the air valve. Other hammer configurations could be adapted to the teachings of the present invention, as will be appreciated by those skilled in the art. The requisite functions of the hammer are that it can be retained by the cocking pawl and urged against the main spring. 
     Reference is directed to  FIG. 12 , which is a drawing of a compressed gas gun breech seal spring  12  according to an illustrative embodiment of the present invention. The breech seal spring  44  is slid over the breech seal (not shown) and engages the cocking member (not shown) so at to urge the breech seal away from the cocking member. In operation, as the cocking member is urged toward the gas valve, the breech seal engages the gas valve and is urges there against by the compressive force of the breech seal spring  44 . Refer to the  FIG. 5  for a graphical depiction of this arrangement. 
     Reference is directed to  FIGS. 13A, 13B, and 13C , which are a side view drawing, a breech end view drawing, and a muzzle end view drawing, respectively, of a compressed gas gun breech seal  30  according to an illustrative embodiment of the present invention. The breech seal  30  functions to sealably engage the barrel (not shown) and the gas valve (not shown) to provide a pneumatic path for compressed gas to be forced into the barrel breech (not shown) and drive the projectile (not shown). Since the breach seal  30  must be moved away to facilitate loading a projectile, it is coupled to the cocking member (not shown) and slides together therewith. This coupling is facilitated using a pair of pin fasteners (not shown) inserted into a pair of holes  31  on either side of the breech seal  30 . These pins slidable engage a pair of corresponding slot in the cocking member (see items  54  in  FIG. 8C  and  FIG. 8D ). The play inherent in aligning a pin with a slot is addressed through the use of the breech seal spring (see  FIG. 12 ), which is disposed between the breech seal  30  and the cocking member (not shown). The breech end face  56  of the breach seal  30  engages the gas valve (not shown) and acts to transfer the force of the hammer (not shown) through the breech seal to the gas valve. Note that the breech seal includes a clearance chamfer  33  to clear the location of the cocking pawl (not shown). Details of the physical arrangement are presented in  FIGS. 14A, 14B, and 14C , and are hereinafter described. 
     Reference is directed to  FIGS. 14A, 14B, and 14C , which are section view drawings of a compressed gas gun in a loading position, a cocked position, and a fired position, respectively, according to an illustrative embodiment of the present invention. These drawings will assist the in understanding the sequence of actions in operating the gun and the interrelation of the various component parts. The receiver  4  with barrel  18  fixed thereto, barrel breech  22 , breech opening  14 , gas cylinder  6 , and gas valve  32  are again presented. The cocking pawl  43  portion of the trigger assembly location is shown. Note the cocking slot  26  in the receiver  4  is again illustrated in phantom line since it is actually removed by virtue of the section view geometry. So too are the cocking assembly mounting holes  36  in the cocking member  34  shown in phantom. It is important to understand that the actuation of the mechanisms presented herein are effected by operation of the cocking mechanism (not shown), which are presented in  FIG. 2  and  FIG. 3 . Thus, the driving force in the operation of the cocking mechanisms is input through the cocking mechanism holes  36  in the cocking member  34 , which may be urged either toward the muzzle end of the gun or toward the breech end of the gun. 
     There are several components slidably located along the length of the barrel  18 . These include, beginning from the muzzle end of the barrel  18 , the spring stop  38 , the main spring  40 , the hammer  42 , and the breech seal  30 . The cocking member  34  is slidably disposed between these several items, excepting the spring stop  38 , and the interior of the receiver  4 . The spring stop  38  is threadably engaged with the cocking member  34 . Note also that the breech seal  32  movement with respect to the cocking member  34  is limited to the length of the opposing slots (items  54  in  FIG. 8C  and  FIG. 8D ). Thusly, as the cocking tube us urged between the muzzle end position and the breach end position by the cocking mechanism (not shown), the breach seal  32 , hammer  40 , main spring  42 , and spring stop  38  are also urged to slide together therewith, subject to the spacing between each of them and their connection to the cocking member  34 . In the sequence discussion to follow, note that the cocking pawl  43  is enabled to selectively retain an release the hammer  40  under control of the trigger mechanism (not shown). 
       FIG. 14A  illustrates the gun in a condition where it has been loaded by the operator, but not yet cocked. Note that the cocking mechanism (not shown) has urged the cocking member  34  toward the muzzle end of the gun and the cocking pawl  43  has been urged inward by the trigger mechanism (not shown). Note that the cocking mechanism holes  36  in the cocking member  34  are advanced as far as possible toward the muzzle end of the cocking slot  26  in the receiver  34 . Also note that the operator has inserted a projective  60  into the breech of the barrel  18 . In this condition, the cocking pawl blocks the reward movement of the hammer  42 , but the main spring is relaxed due the extended distance between the spring stop  38  and the hammer  42 . 
       FIG. 14B  illustrates the gun in the cocked position. The gun is cocked by actuation of the cocking mechanism (not shown), which urges the cocking member  34  toward the breech end of the gun. Note that the cocking mechanism holes  36  in the cocking member  34  are advanced as far as possible towards the breech end of the cocking slot  26  in the receiver  34 . As the cocking member  34  is advanced toward the breech end, the spring stop  38  applies force against the mains spring  40 , which applies force against the hammer  42 . However, since the hammer  42  is retained by the cocking pawl  43 , the main spring  40  must compress to accommodate movement of the spring stop  38 . Thusly, the energy applied to the cocking mechanism (not shown) is stored in the main spring  40  by compression. The mechanical advantage, discussed hereinbefore, of the cocking mechanism (not shown) aides the operator in compressing the main spring  40 . Also note that the movement of the cocking mechanism  34  toward the breech carries the breech seal  30  rearward such that it sealably engages the gas valve  32 . This sealing action is assisted by compression of the breech seal spring  44 . Elastomeric seals disposed between the barrel  18  and the breech seal  30 , and disposed between the breech seal  30  and the gas valve  32  perfect a pneumatic pathway from the gas valve  32  to the breech of the barrel  18 . The gun is now ready to be discharged. 
       FIG. 14C  illustrates the gun as it is discharged by actuation of the trigger mechanism (not shown), which drops the cocking pawl  43  away from the hammer  42 . As this occurs, the energy stored in the main spring  40  is released and applied against the hammer  42 , urging it toward the breech end of the gun. The hammer  42  accelerates and impacts the breech seal  30 . Since the breech seal  30  is already engaged with the gas valve  32 , the hammer  42  energy is immediately transferred to the gas valve, thereby “popping” the gas valve  32  and releasing a burst of compressed gas into the breech seal  30  and barrel  18 . Of course, the gas pressure applies force against the projectile  60 , and discharges it from the muzzle. The gas valve  32  immediately closes as soon as the spring forces and pressures balance between the interior of the gas cylinder  6  and the burst of gas behind the projectile  60 . 
     Thus, the present invention has been described herein with reference to a particular embodiment for a particular application. Those having ordinary skill in the art and access to the present teachings will recognize additional modifications, applications and embodiments within the scope thereof. 
     It is therefore intended by the appended claims to cover any and all such applications, modifications and embodiments within the scope of the present invention.