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. 23, 2012
Filed:
Mar. 18, 2011
Shigeru Muramatsu, Hamamatsu, JP;
Hisashi Takeyama, Hamamatsu, JP;
Shigeru Muramatsu, Hamamatsu, JP;
Hisashi Takeyama, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu-shi, JP;
Abstract
A surfaceof a butthas a flat portionwhich is situated forward and has a small inclination angle and a slanting pressure receiving portionwhich is situated backward and has a large inclination angle as areas pushed up by a jack. Between the flat portionand the slanting pressure receiving portion, an escapement portionhaving an obtuse angle is formed. The escapement portionis provided to correspond to a position of the jackplaced immediately after the start of swinging of the jack. The inclination angle of the slanting pressure receiving portionis determined such that in a stage where a key starts returning from a slow full stroke key-depression, a position at which the buttis in contact with the jackis maintained with the buttswinging backward.