Music – Instruments – Stringed
Patent
1996-02-08
1998-09-08
Luebke, Renee S.
Music
Instruments
Stringed
84216, G10C 302
Patent
active
058047450
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for adjusting a sound volume of a grand piano.
1. Background Art
When a grand piano is played, it is desirable to adjust its sound volume depending on the surrounding conditions such as in an apartment house, at night or the like. However, the actual state of things is that there cannot be found a grand piano which can be adjusted to a desired sound volume with a simple operation and which has a sufficient sound-insulating effect.
2. Disclosure of the Invention
The present invention has an object of solving this kind of problems.
In order to attain the above objects, the apparatus for adjusting a sound volume of a grand piano relating to the present invention, as described in claim 1, is characterized in that a lower opening in a case of the grand piano is covered by a sound-insulating board having an opening and closing portion. The opening and closing portion is made up of a louver, a door, or a bellow which can be opened and closed, and is arranged to be opened and closed by an operating member which is provided on a lower portion of the case. The operating member has a construction which is made up of a wire which is connected to an opening and closing member of the opening and closing portion, a travelling block which is connected to the wire and which is movable in a direction of extending the wire, and a rotatable threaded bar with which the travelling block is engaged in a threaded manner and to one end of which is attached a handle or a construction, as described in claim 6, which is made up of a wire which is connected to the louver, a first lever to one end of which the wire is connected and in which a spring is extended between said one end and a lower portion of the case, and a second lever a front end of which is pivotally supported in a rotatable manner by a supporting member which is provided on a lower portion of the case and in which the other end of the first lever is pivotally attached in a rotatable manner to an intermediate portion of the second lever, wherein the spring is fixed at one end thereof to a lower portion of the case such that, when the first lever and the wire connected thereto move in response to the rotation of the second lever whereby the louver moves from a closing direction to an opening direction, a spring force to tract the wire in a direction of moving the louver from the opening direction to the closing direction is generated. Another apparatus for adjusting the sound volume according to the present invention is, as described in claim 7, characterized in that, in a grand piano in which that top board of a case which can be opened and closed is made up of a front portion and a rear portion which are connected together by hinges and in which a music rack which can be erected and laid down is mounted on an inside of the case on the front portion side, a sound-insulating board is provided between that plate for extending strings therealong which is mounted inside the case and the music rack in close contact with an inner wall of the case, and that a sound-insulating opening and closing board is provided, in a manner that can be erected and laid down, on the sound-insulating board, the sound-insulating opening and closing board being operated to open and close an opening portion between the sound-insulating board and a front edge of the rear portion of the top board. In the apparatus as described in claim 7, it may be arranged, as described in claim 8, that the lower opening of the case is covered by a sound-insulating board having an opening and closing portion. The sound-insulating board that is provided, in the apparatus as described in claim 7, between the plate along which the strings are extended and the music rack may be provided with an opening and closing portion. Further, an air bag may be disposed between the sound-insulating board in the lower opening of the case and a sound board, the air bag being capable of inflating by charging air thereinto for urgingly contacting the sound board to thereb
REFERENCES:
patent: 1722978 (1929-07-01), Hammond, Jr.
Hsieh Shih-yung
Kabushiki Kaisha Kawai Gakki Seisakusho
Luebke Renee S.
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