Kabushiki Kaisha Kawai Gakki Seisakusho

Manabu Arimori

Riichi Kitashima

Yutaka Nakao

A front lid opening and closing assist which enables an easy and safe operation of opening and closing a front lid of a keyboard instrument. A buffer in the front lid opening and closing assist has a first damping mechanism for damping the front lid when pivoted from a neutral position to an open position, and a second damping mechanism for damping the front lid when pivoted from the neutral position to a closed position. When the front lid is pivoted beyond the neutral position, it spontaneously pivots toward the open or closed position by its own weight. However, this motion is damped by the first and second damping mechanisms, which results in a slowed pivot motion of the front lid. As a result, a user can safely open or close the front lid relative to a back lid, with only minimal force for supporting the front lid.

Opening and closing assist for a front lid of a keyboard instrument

In an apparatus for opening an closing a top board of a grand piano, the top board is hingedly supported along one side thereof on an outer rim of the grand piano. The apparatus has a gear-type of jack made up of a jack main body fixed to a wooden fame of the grand piano, and a rod which is movable in a longitudinal direction through the jack main body and which supports the top board in a manner to open and close said top board.

Apparatus for opening and closing top board of grand piano

A method of mounting a plate in a grand piano is provided for ensuring an appropriate bridge pressure in accordance with an actual amount of swelling of a soundboard and its distribution in a simple manner without requiring bridge pressure setting and re-adjustment. The method comprises the steps of measuring the heights of a bridge from a reference plane at a plurality of predetermined positions of the bridge on the back assembly; attaching a plurality of plate bases at a plurality of positions along the outer periphery of the top surface of the back assembly at heights corresponding to the measured heights of the bridge; and carrying the plate on the plurality of plate bases, and fixing the plate carried on the plate bases to the back assembly.

Growing community of inventors

Hamamatsu, Japan

Manabu Arimori