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. 11, 1989
Filed:
Oct. 26, 1987
Shinji Kumano, Shizuoka, JP;
Motoshi Murasaki, Shizuoka, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hamanatsu, JP;
Abstract
A keyboard device of an electronic musical instrument has a keyboard frame, a plurality of keys which are aligned on the keyboard frame and which are vertically pivotable, a plurality of return springs each of which corresponds to one of the keys and has one end stopped by the key and the other end stopped by the keyboard frame so as to bias the key toward a nonstruck position, and a plurality of pivot members each of which is disposed on the keyboard frame at an end of a longitudinal axis of the key to correspond to one of the keys. The pivot member has a circular surface to be brought into slidable contact with a back end portion of the key so as to allow the key to perform pivotal movement. The back end portion of the key has a circular surface paired with the circular surface of the pivot member and is spring-biased against the circular surface of the pivot member by means of the return spring.