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. 15, 1991
Filed:
Jun. 12, 1990
Tatsuo Furukawa, Shizuoka, JP;
Kawai Gakki Seisakusho Co., Ltd., Hamamatsu, JP;
Abstract
This invention relates to an opening/closing apparatus for preventing abrupt fall and rotation of a keyboard cover in a keyboard musical instrument. The opening/closing apparatus of a keyboard cover in accordance with the present invention is characterized in that an oil damper which includes a flange portion, a damper case and a back portion, allows a square end portion of a damper shaft to project from the surface of the flange portion and disposes a receptacle having a U-shaped groove encompassing the square end portion with a predetermined gap of the surface of the flange portion is buried at a predetermined position on the inner surface of each side plate of a musical instrument main body, recesses are formed on both side surfaces of a thick base portion of the keyboard cover, connecting members having tenon-like protuberances having slits at one of the end portions of the rod portion thereof are fitted into the recesses and the slits of the connecting members are meshed with both side surfaces at the square end portion of the damper shaft so as to connect rotatably and removably the keyboard cover to the musical instrument main body.