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:
Jun. 07, 2011
Filed:
Mar. 23, 2009
Toshiyuki Iwamoto, Hamamatsu, JP;
Mitsuru Kitajima, Hamamatsu, JP;
Shigeru Muramatsu, Mori-machi, JP;
Koichi Saigo, Hamamatsu, JP;
Toshiyuki Iwamoto, Hamamatsu, JP;
Mitsuru Kitajima, Hamamatsu, JP;
Shigeru Muramatsu, Mori-machi, JP;
Koichi Saigo, Hamamatsu, JP;
Yamaha Corporation, , JP;
Abstract
A leveris supported by a lever supporting portion. The leveris urged by a first springand a second spring. The urging force of the first springvaries over the entire operational range of the lever. The second springand a third springare provided serially through a movable supporting member. The displacement of the movable supporting memberis restricted by a fixed supporting member FR. If the urging force of the second springexceeds the urging force of the third spring, the restriction on the displacement of the movable supporting memberis removed. Therefore, the present invention provides a player with feeling similar to that the player perceives when he manipulates a damper pedal of an acoustic piano.