Firearm pneumatic counter-recoil modulator & airgun thrust-adjustor

) The pneumatic counter-recoil apparatus according to claim-1, wherein the relative cross-sectional area of said piston-rod determines the amount of end-thrust force as a result of a given internal gas-pressure acting only relative to the cross-section of said gas-chamber, the differential-ratio of piston-rod diameter to cylinder diameter thus producing said near constant compressive resistance of said piston-rod as it becomes plunged into said cylindrical gas-chamber.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said gas-tight cylindrical body can be circular or non-circular in cross-section, and said first end-wall portion is formed integrally therewith, while said second end-wall is a separate piece permanently stationed in an imperforately sealed manner thereto, and said dynamic/gas-seal being of a lip type cross-section whereby the diametrically opposed and radially innermost lip-bifurcations are oriented inwardly toward said gas-chamber.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said pneumatic cartridge may be employed in a manner either whereby the said cylindrical-wall portion is fixed and said piston-rod moves, or conversely, said piston-rod may be fixed and said cylindrical-wall portion moves, or, both said cylindrical-wall portion and said piston-rod can move relative to one another;

• either of the three implementations achieving the object of eliminating the conventional metal/recoil-spring.

) The pneumatic counter-recoil apparatus according to claim-1, wherein altering the cross-section of said piston-rod relative to the cross-section of said cylindrical-wall gas-chamber and its static-pressure, enables the designer to tailor the characteristics of the cartridge to suit a wide scope of performance criteria;

• ranging from a nearly flat compression energy graphic-chart profile, to a relative steeply sloped graphic-chart profile more approximating that of a conventional metal/recoil-spring.

) The pneumatic counter-recoil apparatus according to claim-1, wherein force of said dynamic/gas-seal impingement loading upon said piston-rod can be designed as to range from light to heavy drag resistance upon said piston-rod;

• a light drag-loading being generally suitable for guns employing a breech locking-mechanism, while a heavy drag type seal characteristic of greater contact-area is particularly appropriate for guns inherently relying upon the initial breakaway resistance of the breech block mechanism.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said longitudinal-bore includes a stabilizing support-bushing providing a rigid bearing surface for more reliable cyclic operation, thereby reducing wear upon resilient said dynamic/gas-seal.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said dynamic/gas-seal is of the annular-lip type oriented with the lip extending inward toward said gas-chamber region;

• and whereby said chamber may be given any desired degree of charge or recharge by simply placing said cartridge assembly within a pressurizing-chamber, the resulting pressure-differential inducing the annular-lip seal to open in the manner of a one-way valve whereby higher ambient gas-pressure readily migrates into the chamber until equalized internally, whereupon the thus charged said cartridge is removed from pressurizing said gas-chamber ready for use.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said piston-rod is terminated with a piston-head within said gas-chamber as to provide a controlled-rate of critically sized leakage-gap means relative to said cylindrical-wall, thereby enabling the designer to variably regulate rate of piston-rod movement throughout the travel of the piston-rod upon firing of the gun.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said cylindrical-wall is necked-down regionally, either forwardly or aftwardly, or forwardly and aftwardly, or approximately medially, and whereto said piston-rod includes a piston-head which is either sized to slideably impinge with said necked-down cylindrical-wall surfacing, or critically sized to provide a leakage-gap relative to said necked-down cylindrical-wall surfacing;

• thereby enabling the designer to variably regulate rate of piston-rod movement throughout the travel of the piston-rod upon firing of the gun.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said first end-wall is in axial support of an opposing static/chamber-piston member having an annular-seal means impinging upon said cylindrical-wall of said gas-chamber, whereby an externally adjustable screw-threaded coaxial-shank member abutting inwardly against the ambient facing side of said static-piston acts to conveniently enable a degree of user adjustment of said gas-chamber positive-pressure resultantly higher or lower by displacing said static/chamber-piston inward or outward relative to said gas-chamber;

• as may be desired for example in order to tuneably compensate for different types of ammunition explosive energy which effects the recoil action of the gun.

) The pneumatic counter-recoil apparatus according to claim-1, wherein a pair of permanent-magnets are included within the cylinder-chamber, a first/permanent-magnet being affixed proximal the pneumatic-chamber's aftward first/end-wall, and a second/permanent-magnet being affixed to the inboard terminus of the piston-rod, said first/permanent-magnet and said second/permanent-magnet elements being oriented whereby they are respectively interfacing with their thus opposing like magnetic-poles directed toward each other as to generate a repulsion action when said second/permanent-magnet recedes into said pneumatic-chamber to a point proximal said first/permanent-magnet;

• thereby imposing supplementary spring like buffering action to defeat further retraction of said piston-rod.

) The pneumatic counter-recoil apparatus according to claim-1, wherein a pair of permanent-magnets are included within the cylinder-chamber, a coaxial annular first/permanent-magnet being affixed proximal the pneumatic-chamber's forward second/end-wall, and a coaxial annular second/permanent-magnet being affixed to the inboard terminus of the piston-rod, said first/permanent-magnet and said second/permanent-magnet elements being oriented whereby they are respectively interfacing with their thus opposing and like magnetic-poles directed toward each other as to generate a repulsion action when said second/permanent-magnet is displaced by pneumatic-pressure forwardly in said pneumatic-chamber to a point proximal said first/permanent-magnet;

• thereby imposing a supplementary spring like counter-force defeating further extension of said piston-rod.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said cylindrical-wall includes a static slider-piston having an annular-seal impinging radially upon the inside-diameter of said cylindrical-wall while supported against the constant thrust of gas-chamber pressure by an externally adjustable male/screw-threaded member means acting upon mating female/screw-threads upon said tubular piston-rod;

• hence, said slider-piston serving to conveniently enable a degree of user adjustment of said gas-chamber positive-pressure by resultantly displacing said slider-piston forward or aftward relative to said gas-chamber as may be desired, for example in order to tuneably compensate for different types of ammunition explosiveness effecting the recoil action of the gun.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said first end-wall outwardly includes a coaxial locating means in support of an inertial-mass member biased toward said first end-wall via a compression-spring supported against a distal travel-limit abutment means;

• the reactive effect of the captive said inertial-mass member being to prolong the duration of energy transfer in the closure of breech mechanisms.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said longitudinal piston-rod member is formed tubular as to thereby contain a secondary/piston-rod member arranged coaxially therein and including a secondary/piston-flange serving to limit the outward telescopic travel of said secondary/piston-rod;

• the advantage of this telescopic piston-rod arrangement being to facilitate a greater overall extended telescopic-length relative to a given said cylindrical-wall length.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said longitudinal piston-rod is formed tubular as to thereby receive therein a similar opposing/piston-rod arranged as to be extendible acting outwardly from said first end-wall;

• hence, when the gun is fired the center cylindrical-wall receives both the smaller diameter said opposing/piston-rod whilst the larger diameter said piston-rod follows into opposite retraction, thereby giving advantage of facilitating a greater overall extended telescopic-length relative to a given said cylindrical-wall length.

) The pneumatic counter-recoil apparatus according to claim-1, wherein said pneumatic/recoil-spring is a wholly removable cartridge unit facilitating quick and easy drop-in retrofitting simply upon removal of an existing metal/recoil-spring member from said gun cavity.

) A method of converting a conventional metal/recoil-spring buffered firearm into a pneumatic/recoil-spring buffered gun for improved modulation of counter-recoil action;

• said method comprising:
• first, extracting the OEM metal/recoil-spring from its operating cavity as to spatially enable retrofitting;
• then, insert a gas-spring/cylinder having coacting piston-rod assembly which is diametrically and lengthly sized to specifically occupy said gun operating cavity formerly housing the removed metal/recoil-spring.

) A manually-selective pressure-modulator means for conveniently adjusting the potential propulsive force thrusting a projectile from a conventional compressed-gas powered gun;

• said pressure-modulator device comprising:
• a slidable attenuator-piston means arranged aftwardly within the imperforate cylindrical-chamber of the gun's manually actuated gas/propulsion-spring chamber having a longitudinal-axis and a trigger released manually recockable longitudinally reciprocating-piston with an external thruster-head acting to launch a projectile placed within the staging-chamber of the gun's longitudinal barrel-bore, said attenuator-piston including a screw-threaded adjustor-shank means extending longitudinally aftward from said cylindrical-chamber whereby said adjustor-shank can be coaxially rotated thereby moving said attenuator-piston forward or aftward as to effectively vary the compression-ratio of gas contained within said cylindrical-chamber as desired.