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:
Apr. 28, 2009
Filed:
Aug. 02, 2007
Tomio Kumamoto, Kobe, JP;
Tomio Kumamoto, Kobe, JP;
SRI Sports Limited, Kobe-Shi, Hyogo, JP;
Abstract
Points obtained by plotting flexural rigidity EI measured at ten sites on a shaft are defined as from T () to T () in this order from the head side, and the formula representing a line K that passes the T () and the T () is defined as [Y=aX+b1]. The values at the Y-intercepts on the lines that are parallel to the line K and that pass the points of from T () to T (), respectively, are defined as from b2 to b9, respectively, and the minimum value among the values at the Y-intercepts b2 to b9 is defined as bmin. Slope 'a' of the line K is 0.04 or greater and 0.06 or less; every one of the b3, b4, b5, b6, b7 and b8 is smaller than b1; and the bmin is any one of b4 to b7. The value (b1−bmin) is 30 (N·m) or greater and 40 (N·m) or less, and the value (b9−b1) is 4 (N·m) or greater and 15 (N·m) or less. This shaft either has a high-strength straight layer and a hoop layer, or has a textile layer.