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. 26, 2010
Filed:
Mar. 11, 2008
Shigehiro Okamoto, Hamamatsu, JP;
Shigehiro Okamoto, Hamamatsu, JP;
Yamaha Corporation, Shizuoka-ken, JP;
Abstract
A cylinder of a drum is produced using a plurality of laminated woods, each of which is formed using a plurality of thin wooden boards, which have grains aligned in the longitudinal direction thereof and which are joined together in the width direction. The laminated woods having rectangular shapes in plan view are reshaped by slantingly cutting out the opposite end portions lying in the width direction along their longitudinal directions. A plurality of reshaped laminated woods are joined together in the width direction so as to form a polygonal cylinder (e.g., a fourteen-sided polygonal cylinder). Then, the exterior and the interior of the polygonal cylinder are subjected to cutting work in a concentric manner in view of different radii, thus completely forming the cylinder having a circular cylindrical shape.