Carbon fiber arrow and continuously winding method thereof

US6251036A · kind A · utility

Assignee

• Beijing Institute of Aeronautical Materials, AVIC I

Inventors

• Xiang Wu · Tangxia, CN
• Qingzhu Mao · Beijing, CN
• Wenhao Chen · Beijing, CN
• Dahai Sun · Beijing, CN
• Minyong Liu · Foshan, CN
• Weifang Chen · State College, US

Key dates

• Filing date: Mar 1, 2000
• Grant date: Jun 26, 2001
• Expiry date: Mar 1, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F42B6/04
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

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, …