Mechanical guns and projectors – Element – Projector barrel
Reexamination Certificate
2000-04-20
2001-08-14
Ricci, John A. (Department: 3712)
Mechanical guns and projectors
Element
Projector barrel
C124S073000, C124S083000
Reexamination Certificate
active
06273080
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to paint ball guns and, more particularly, to gun barrels suitable for paint ball guns.
BACKGROUND OF THE INVENTION
The use of paint ball guns has become a very popular recreational sport. Paint ball gun competitions are generally very competitive, demanding paint ball guns capable of high efficiency and high performance.
Paint ball guns are almost universally made to propel a paint ball having an external diameter between about 0.675 inches and about 0.695 inches using a source of compressed gas, such as carbon dioxide. In the operation of a typical paint ball gun, a paint ball is deposited into the compression zone portion of the gun barrel. Thereafter, when the trigger is pulled, a short blast of compressed gas propels the paint ball through the compression zone portion and out the muzzle portion. It is important in the performance of paint ball guns that the internal diameter of the compression zone portion closely matches the external diameter of the paint ball ammunition. The internal diameter of the compression zone portion should be within about 0.002 inches of the external diameter of paint ball ammunition. Smaller diameters will tend to cause the paint ball to break up within the compression zone portion or become lodged within the compression zone portion. Larger diameters will result in decreased projecting power (because an undue amount of compressed gas will leak around the outside of the paint ball).
A problem for the competitive paint ball gun user arises from the fact that the external diameter of the paint ball ammunition varies from manufacturer to manufacturer and even from production vats to production vats. Heretofore, there has been no known solution to this problem. Accordingly, there is a need for an inexpensive yet efficient combination which avoids this problem in the prior art.
SUMMARY
The invention satisfies this need. In one embodiment, the invention is a combination comprising a paint ball gun with a gun barrel having a muzzle portion and at least two interchangeable compression zone portions having slightly differing internal diameters.
In a preferred version of this embodiment, the compression zone portions are attachable and deattachable from the muzzle portion by a non-threaded connection mechanism, such as a snap-on type connection mechanism, a cam-lock type connection mechanism or a bayonet type connection mechanism. In another embodiment, the invention is a kit comprising at least two compression zone portions of a gun barrel suitable for use in a paint ball gun, wherein each compression zone portion is readily attachable and deattachable from the muzzle portion of the paint ball gun barrel. In the kit, each compression zone portion has a slightly different internal diameter.
In another embodiment, the invention is a method for using a paint ball gun having multiple, interchangeable compression zone portions. In the method, the user selects a particular batch of paint ball ammunition and then chooses a particular compression zone portion most optimum for use with the paint ball ammunition. The compression zone portion is attached to the muzzle portion within the paint ball gun barrel and the paint ball gun is thereafter used to discharge paint balls with optimum power and efficiency.
REFERENCES:
patent: 985308 (1911-02-01), VanVoorhis
patent: 2003290 (1935-06-01), Gurney et al.
patent: 2117935 (1938-05-01), Benjamin et al.
patent: 3989027 (1976-11-01), Kahelin
patent: 4644930 (1987-02-01), Mainhardt
patent: 5630406 (1997-05-01), Dumont
patent: 2602455 (1977-08-01), None
patent: 1033880 (1966-06-01), None
Anderson Denton L.
Ricci John A.
Sheldon & Mak
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