Patent Number: 6,251,036

Title: Carbon fiber arrow and continuously winding method thereof

Abstract: A carbon fiber arrow shaft comprises a hollow tube, a reinforced carbon fiber, and a resinoid binder. The hollow tube has a length between 500-900 mm, an inner diameter between 2-10 mm, and a tube wall thickness between 0.3-2 mm. The reinforced carbon fiber and the resinoid binder form a resin-impregnated carbon fiber. The carbon fiber arrow shaft is formed by directly and continuously winding the resin-impregnated carbon fiber around the hollow tube. The carbon fiber arrow shaft has a head section (L1), a middle section (L2) and a tail section (L3). A winding angle of the carbon fiber at the head section (L1) is changed from a larger winding angle to a smaller winding angle, a winding angle at the middle section (L2) stays constant, and a winding angle at the tail section (L3) is changed from a smaller winding angle to a larger winding angle. The lengths of the head section (L1) and the tail section (L3) are between 25-250 mm. The initial winding angle at the head section (L1) is between 30-90 degrees and is gradually decreased to between 2-30 degrees at the boundary of the head section (L1) and the middle section (L2). The winding angle at the middle section (L2) stays constant, and the winding angle at the tail section (L3) is gradually increased from between 2-30 degrees at the boundary of the middle section (L2) and the tail section to between 30-90 degrees at the end of the tail section (L3). The peripherally located winding angles at both the head section (L1) and the tail section (L3) are at least two times the winding angle at the middle section (L2). The shaft provides uniformity of wall thickness and eliminates overlapping joints or surface protrusions.

Inventors: Wu; Xiang (Beijing, CN), Mao; Qingzhu (Beijing, CN), Chen; Wenhao (Beijing, CN), Sun; Dahai (Beijing, CN), Liu; Minyong (Beijing, CN), Chen; Weifang (Beijing, CN)

Assignee: Beijing Institute of Aeronautical Materials

International Classification: F42B 6/04 (20060101); F42B 6/00 (20060101); F42B 006/04 ()

Expiration Date: 06/26/2018