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:
Jul. 26, 2011
Filed:
Feb. 03, 2010
Applicant:
Satoshi Inoue, Shizuoka-ken, JP;
Inventor:
Satoshi Inoue, Shizuoka-ken, JP;
Assignee:
Yamaha Corporation, Shizuoka-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10D 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An upright piano includes action units between keys and hammers, and the action units are less prompt so that a missing tone tends to take place in a music passage through high-speed repetition; the action unit is constructed from a whippen assembly, a jack mechanism provided on the whippen assembly and a regulating button mechanism for an escape in cooperation with the jack mechanism, and a compression coil spring is provided between a center rail and the whippen assembly for urging the whippen assembly in a direction toward the original position, thereby accelerating the restoration of jack to the contact with the hammer.