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Publication numberUS20060101697 A1
Publication typeApplication
Application numberUS 10/988,225
Publication dateMay 18, 2006
Filing dateNov 15, 2004
Priority dateNov 15, 2004
Publication number10988225, 988225, US 2006/0101697 A1, US 2006/101697 A1, US 20060101697 A1, US 20060101697A1, US 2006101697 A1, US 2006101697A1, US-A1-20060101697, US-A1-2006101697, US2006/0101697A1, US2006/101697A1, US20060101697 A1, US20060101697A1, US2006101697 A1, US2006101697A1
InventorsRaymond Bushnell
Original AssigneeBushnell Raymond B
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Paintball gun barrel construction
US 20060101697 A1
Gun barrel construction with bore surfaces defined by different curvature surfaces which, in conjunction with dynamic fluid pressure, serve to confine a spherical projectile against lateral displacement. Rotation is imparted to the projectile in a direction contra to projectile travel to enhance range of the projectile.
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1- A gun barrel receiving a spherical projectile including,
an arcuate surface.
surfaces of lesser curvature contiguous with the arcuate surface and along which a spherical projectile may travel, and
vent means effecting a pressure drop across a moving projectile biasing the projectile into rolling contact with said surfaces.
2- A gun barrel for a spherical projectile and having a bore defined by
a primary surface formed on a radius,
secondary surfaces formed on radii greater than the radius of the primary surface and along which a spherical projectile travels, and
vent means for effecting a pressure drop across a moving projectile to bias the projectile into rolling contact with said secondary surfaces.
3- A gun barrel for a ball shaped projectile and including
a primary arc having a first radius,
secondary arcs each formed on a radius greater than said first radius,
said primary arc defining along with a projectile a space for a fluid flow acting on a projectile and urging same into contact with the secondary arcs imparting counter rotation to the projectile, and
vents spaced in linear fashion along the barrel.
4- A gun barrel through which a spherical bullet travels, said barrel having a bore defined by a primary wall formed on a radius and secondary walls each formed on a radius greater than that of the primary wall to provide tracks along the barrel on which the spherical bullet travels in a guided manner in the presence of fluid pressure acting on the bullet and urging the bullet into rolling contact with the secondary walls imparting rotation to the bullet counter to the direction of bullet travel, and
vent means in communication with the bore at a location intermediate said secondary walls.
  • [0001]
    The present invention pertains to paintball guns which fire a gas propelled projectile filled with a colored marking fluid with the projectile shell fracturing to indicate target contact.
  • [0002]
    In wide use presently are paintball guns typically used in mock combat by opposing teams. Other uses for marking with paintball fired projectiles may exist. The range of a paintball fired in mock combat averages 250 feet or so. Paintball gun bores typically are of circular cross-section with some having rifling. It has been found advantageous to paintball range to impart backspin to the spherical projectile which in one instance is achieved by propelling the projectile through a barrel having curved segments spaced therealong causing the projectile to engage an upper surface of the gun bore. Such a barrel is made and sold by Tippmann Pneumatics, Inc. of Fort Wayne, Ind. While a fired projectile from a conventional barrel may have a range beyond 200 feet or so, the accuracy of same deteriorates beyond 100 feet as the spherical ball has a tendency to vary from a true trajectory.
  • [0003]
    The present invention is embodied within a gun barrel which provides for the guidance of a projectile along bore surfaces imparting rotation to the projectile while curtailing lateral movement of same during barrel passage.
  • [0004]
    The present invention serves to improve the accuracy and range of a gas propelled projectile by restricting the projectile against lateral movement during barrel passage. A pressure drop across a projectile during barrel passage results in maintaining contact of the projectile with linear surfaces of the gun barrel. The firing of a paintball by the release of air or gas pressure serves both to propel the paintball as well as bias same into contact with the barrel linear surfaces.
  • [0005]
    Important objectives include the provision of gun barrel design which contributes to the accuracy of flight of the spherical projectile by restricting lateral displacement of same during passage through a gun barrel; the provision of a gun barrel design which assures imparting a backspin to the projectile contributing to projectile range; the provision of a gun barrel design wherein bore defining linear surfaces serve as a track along which a projectile travels in a confined manner with a pressure drop across the projectile assuring maintenance of the projectile in contact with track surfaces.
  • [0006]
    In the accompanying drawings:
  • [0007]
    FIG. 1 is a side elevational view of a gun barrel installed on a paintball gun;
  • [0008]
    FIG. 2 is a plan view of the gun barrel of FIG. 1 removed from the gun,
  • [0009]
    FIG. 3 is a vertical sectional view of the barrel shown in FIG. 1; and
  • [0010]
    FIG. 4 is a cross sectional view of the barrel.
  • [0011]
    With continuing attention to the accompanying drawings, the reference numeral 1 indicates generally a barrel of a paintball gun G. The barrel is threaded at 2 or otherwise provided for attachment to the gun. A gun barrel muzzle is at 3.
  • [0012]
    Vent means are shown as ports 4 provided at linearly spaced intervals along the barrel. As noted later, the vent means permits a pressure drop to promote rolling contact of a spherical projectile P with barrel surfaces.
  • [0013]
    In cross-section, as shown in FIG. 3, the barrel bore is vertically asymmetrical. A primary bore surface at 7 is formed on a primary radius 8. The paintball P is shown as being spherical but may be deformed somewhat by air or gas pressure during firing.
  • [0014]
    With attention again to the barrel bore, an upper portion of the bore is defined by upper arcuate surfaces 10 which constitute a track for paintball travel. Surfaces 10 are formed on radii at 12 and 13, having centers 14 and 15 offset from bore axis 16.
  • [0015]
    From the foregoing it will be seen, per FIG. 4, that upon release of compressed air or gas upon firing of the paintball gun, a pressurize drop will occur vertically across between areas A1 and A2 simultaneously urging the projectile toward the upper portion of the barrel and specifically into rolling contact with surfaces 10 imparting rotation of the projectile. Dynamic pressure occurring forward of the fired projectile will be vented through ports 4.
  • [0016]
    In one embodiment of the preferred form of the present gun barrel, the ports 4 are spaced in linear fashion at intervals of one inch with port diameter of 3/32 of an inch.
  • [0017]
    While I have shown but one embodiment of the invention, it will be apparent to those skilled in the art that the invention may be embodied still otherwise without departing from the spirit and scope of the claimed invention.
Patent Citations
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US4345578 *May 25, 1979Aug 24, 1982Apollo Systems, Inc.Ball projecting device capable of providing spin
US5640945 *May 4, 1995Jun 24, 1997Robert SlonakerPaintball and paintball gun
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US7040310 *Jun 3, 2003May 9, 2006National Paintball Supply, Inc.Paintball projectile drop compensator
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7421935 *Feb 7, 2007Sep 9, 2008Avalon Advanced Products, IncBarrel locking apparatus for a paintball gun
US7937869 *Jan 12, 2009May 10, 2011Levin Yuri SReduction of muzzle jump in firearms
US9188404 *Dec 12, 2013Nov 17, 2015Steven Mark CamilleriUniform rectilinear gun
US20070017358 *Jul 7, 2006Jan 25, 2007Avalon Manufacturing CompanyBarrel locking apparatus for a paintball gun
US20070193569 *Feb 7, 2007Aug 23, 2007Avalon Manufacturing CompanyBarrel locking apparatus for a paintball gun
US20100175548 *Jan 12, 2009Jul 15, 2010Yuri LevinMethod and apparatus for the reduction of muzzle jump in firearms and weapons
US20140352192 *Dec 12, 2013Dec 4, 2014Steven Mark CamilleriUniform Rectilinear Gun
EP3029412A1 *Nov 20, 2015Jun 8, 2016ThalesProjectile and cannon for receiving such a projectile
U.S. Classification42/76.01
International ClassificationF41A21/00
Cooperative ClassificationF41A21/28, F41A21/16
European ClassificationF41A21/28, F41A21/16
Legal Events
Dec 8, 2004ASAssignment
Effective date: 20041108