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:
May. 04, 2004
Filed:
Oct. 08, 2002
Applicant:
Inventor:
Katsuo Itou, Shizuoka, JP;
Assignee:
Yamaha Corporation, Shizuoka-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01H 1/32 ;
U.S. Cl.
CPC ...
G01H 1/32 ;
Abstract
A composite keyboard musical instrument comprises an acoustic piano and a silent system, and the silent system includes a hammer stopper split into two parts assigned to higher/middle pitched parts and a lower pitched part, respectively, and a timing changer for accelerating escape of jacks; although the two parts are independently rotatably supported by bearing units, two transmission mechanisms are used in parallel for transmitting torque from only one electric motor to the two parts and timing changer so that the power transmission system is simple.