Music – Instruments – Stringed
Patent
1990-06-12
1991-10-15
Brown, Brian W.
Music
Instruments
Stringed
G10C 302
Patent
active
050563963
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.
REFERENCES:
patent: 4641565 (1987-02-01), Tachida et al.
patent: 4656913 (1987-04-01), Yoshikawa
patent: 4679482 (1987-07-01), Simanski
patent: 4817487 (1989-04-01), Yamashita
Brown Brian W.
Kawai Gakki Seisakusho Co., Ltd.
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