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:
Nov. 05, 1991
Filed:
Dec. 22, 1989
Applicant:
Inventor:
Shigeyuki Nagatsuma, Hamura, JP;
Assignee:
Casio Computer Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G10C / ; G10H / ;
U.S. Cl.
CPC ...
84744 ; 84439 ; 84440 ; 84DI / ;
Abstract
A piano action device for electronic keyboard musical instruments includes a key arranged on a keyboard chassis so as to be swingable up and down, a first hammer arm swung in response to the depression of the key, switch unit for indicating a start of generating musical sounds to be generated when it is pushed, and a second hammer arm swung in response to the swinging of the first hammer arm to push the switch unit.