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:
Oct. 20, 1992
Filed:
Oct. 11, 1991
Somar Corporation, , JP;
Abstract
A light weight, high strength carbon fiber golf culb shaft includes inner, intermediate and outer tubular layers formed of carbon fiber-reinforced plastic. The intermediate layer is formed of high modulus, high strength carbon fibers having a modulus of 35000 kg/mm.sup.2 or more while the outer layer is formed of high strength carbon fibers having a modulus of 23000-30000 kg/mm.sup.2. Th carbon fibers of the intermediate and outer layers are oriented at an angle in the range of 0 to 15 degrees with respect to the longitudinal axis of the shaft, while the carbon fibers of the inner layer are oriented at an angle of 30 to 80 degrees. The weight ratio of the intermediate layer to the outer layer ranges from 15:85 to 50:50, and the weight of the inner layer is 30-60 % by weight based on the total weight of the three layers. The shaft has a rigidity of 220-240 cycles per minute in terms of frequency and a weight of 63 g or less in the axial length of 1143 mm from the tip end.