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:
Mar. 27, 2012
Filed:
Jan. 11, 2010
Applicant:
Shigeru Muramatsu, Shuchi-gun, JP;
Inventor:
Shigeru Muramatsu, Shuchi-gun, JP;
Assignee:
Yamaha Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10C 3/26 (2006.01);
U.S. Cl.
CPC ...
Abstract
A leveris supported by a lever supporting portion. Through a first pivoting member, the leveris urged by a reaction force stabilization spring, a first springand a second spring. The downward displacement of a second pivoting memberis restricted by a fixed supporting member FR. If the urging force of the first springexceeds the urging force of the second spring, the second pivoting memberis displaced upward. A contact member which is in contact with the first pivoting memberand the second pivoting memberto produce friction force is also provided.