The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 2001
Filed:
Aug. 27, 1999
Shinichi Takemura, Yokohama, JP;
Hideyuki Ohno, Tokyo, JP;
Tomohiro Nakanishi, Kisarazu, JP;
Yutaka Arai, Himeji, JP;
Mikio Shima, Tokyo, JP;
Other;
Abstract
A tapered hollow shaft made of a fiber reinforced composite material, which comprises: (a) at least one angle layer consisting essentially of polyacrylonitrile-based carbon fibers having a tensile modulus ranging from 200 to 500 GPa and a tensile strength ranging from 4000 to 5600 MPa; (b) at least one straight layer consisting essentially of polyacrylonitrile-based carbon fibers having a tensile modulus ranging from 200 to 460 GPa and a tensile strength ranging from 3500 to 5600 MPa; (c) at least one reinforcing layer consisting essentially of pitch-based carbon fibers or polyacrylonitrile-based carbon fibers each having a compressive breaking strain of 1.7 to 5.0%, a tensile modulus ranging from 5 to 160 GPa, a tensile strength ranging from 500 to 3000 MPa and a density ranging from 1.5 to 1.9 g/cm,with the carbon fibers in the reinforcing layer being oriented to incline at an angle of 0° to ±5° to the axial direction of the shaft, with the reinforcing layer being arranged at the thinner portion of the shaft to extend from a tip thereof up to at least {fraction (1/20)} and not more than ¾ of the entire length of the shaft, and with the reinforcing layer being arranged at the outermost portion of the shaft.