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:
Jan. 14, 1992
Filed:
Jul. 09, 1990
Annie Blanc, Villeurbanne, FR;
Gilles Du Gardin, Voiron, FR;
Skis Rossignol S.A., , FR;
Abstract
A racket for ball games includes a frame having a shaped cross-section. The shape of the cross-section varies along the periphery of the frame so that the neutral axis of the racket is situated at a varying distance from the internal edge and external edge of the frame along the periphery of the racket. The neutral axis is located closer to the edge being subjected to compressive stress than the edge subjected to tensile stress. The shape of the cross-section may be such that the ratio of the distances between neutral axis and the internal and external edges, respectively, is equal to the ratio of the tensile and compressive strains of the material forming the frame. In four spaced zones of the frame, the neutral axis is closer to the external edge and in four zones spaced intermediate each of the first four zones, the neutral axis is closer to the internal edge of the frame. The cross-section of the frame may have a rounded trapezoidal shape.