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. 01, 1985
Filed:
Feb. 27, 1984
Yasuhide Kitazawa, Nagano, JP;
Kabushiki Kaisha Sankyo Seiki Seisakusho, Nagano, JP;
Abstract
A drum for a music box comprises a plate having a number of pins on its outer surface and a number of holes in its backface. The plate is bent to form a cylinder. The pins and holes are arranged in a coaxial fashion with each other. Each of the pins has a substantially uniform diameter from its distal end to proximal end. A depth of the holes is smaller than a thickness of the plate and is greater than half the thickness of the plate and is greater than half the thickness of the plate. A diameter of the pins is smaller than the diameter of the holes and is greater than half the diameter of the holes. The drum is preferably formed through a fine blanking method. Thus, the drum is suitable for mass-production in low cost with a high performance.