Abstract: 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.

Abstract: 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.

Abstract: A keyboard device for a musical instrument is provided for reducing or eliminating weights made of lead, which are attached to a key, to reduce the weight of the musical instrument and to adapt for the environmental problem, as well for allowing the user to readily adjust a touch weight at a place other than a factory. A key is swingably supported by a balance pin at a central portion thereof. An action has a wippen pivotally supported by a wippen flange, and is carried on the key at a location behind the balance pin through the wippen. The wippen is applied with moment about the wippen flange in a direction in which the wippen is lifted up by a weight or a spring. The magnitude of the moment is adjusted by an adjuster screw.

Abstract: 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.

Abstract: 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.

Abstract: A method of assembling a grand piano, an outer rim for a grand piano and a manufacturing method thereof, an arm for a grand piano and a fabricating method thereof, and a keyboard musical instrument are provided. The method of assembling a grand piano comprises an outer rim forming step of forming an outer rim, and a part mounting step of mounting to the outer rim, as a base, a plurality of other parts in order to assemble a grand piano. The outer rim of the grand piano is composed of a left flat plate forming a left front linear portion of a grand piano, a right flat plate forming a right front linear portion of the grand piano, and a plurality of arcuate plates mutually having the same radius r, wherein the arcuate plates are joined to connect rear ends of the left flat plate and the right flat plate therethrough to form a curved portion of the grand piano.