| 摘要 |
The high straightness arrow made by the process in the present invention is designed to improve the straightness of the archery arrow. A chamber and a mandrel are made of dissimilar metals. The chamber includes walls creating an external housing and defining an internal airspace. Once the mandrel covered with carbon fiber is positioned through chamber, the mandrel ends are secured, forming an assembly, to straighten mandrel. When heated simultaneously, the different coefficients of thermal expansion of chamber and mandrel cause the chamber to expand more than the mandrel, creating a natural tension along mandrel resulting in a near perfectly straight shaft. As the assembly cools, the mandrel and chamber return to their original length, yet the shaft retains its straightened form. Thus this manufacturing process yields an arrow shaft that is straighter than shafts made of the same materials but with a traditional manufacturing technique. |
| 主权项 |
1. A high straightness arrow shaft having an improved straightness factor of 0.001 inches, manufactured by a process comprising the steps of:
selecting an arrow material type and shaft length; applying a composite fiber material to a mandrel, said mandrel having a first end, a second end, and a first coefficient of thermal expansion; installing said mandrel with said composite fiber material within a chamber assembly, said chamber assembly having a second coefficient of thermal expansion and a first wall disposed opposite a second wall, wherein said first end of said mandrel is secured to said first wall and said second end of said mandrel is secured to said second wall, and wherein said second coefficient of thermal expansion is greater than said first coefficient of thermal expansion; applying heat to said chamber assembly and said mandrel; allowing said mandrel to expand according to said first coefficient of thermal expansion and said chamber assembly to expand according to said second coefficient of thermal expansion, such that expansion of said chamber assembly results in a tension applied to said mandrel thereby resulting in said mandrel having improved straightness; curing said composite fiber material on said mandrel, said composite fiber material now becoming a high straightness arrow shaft; cooling said chamber assembly, said mandrel, and said high straightness arrow shaft, such that said chamber and said mandrel return to an original size; and removing said high straightness arrow shaft from mandrel. |
