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:
Nov. 30, 1993
Filed:
Dec. 23, 1992
Richard L Tennent, Alpine, CA (US);
Richard G Tennent, Spring Valley, CA (US);
Jerald A Rolla, Santee, CA (US);
UniFiber USA, Spring Valley, CA (US);
Abstract
A golf club shaft is described having a 'modified hourglass' shape which provides many predetermined combinations of flex, stiffness and torque (which together are perceived as shaft and club 'feel') and which is virtually immune to breakage in normal play. The shaft is formed of a base rod with expanded axial sections: a grip section, an upper flare section, a flex control section, a lower flare section, and a hosel section. The lower flare section increases in diameter from its junction with the flex control section to a maximum diameter at its junction with the hosel section, which when the club is assembled is preferably recessed into the club head hosel. Variation of the relative lengths and/or thicknesses of the flex control section and the lower flare section determine the location of the junction between them, and thus the relative amounts of flex, torque and stiffness which produce the feel desired in the shaft. The shafts are formed of composite of polymers (resin) reinforced internally by fibers, preferably carbon fibers.