Importance

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Abstract

Since an entire guided surface (from an upper end of an inclined surface to a lower end of a curved surface) faces a guide surface in a scale direction at an initial position before key pressing, even if grease is scraped upward due to swinging of a white, the grease is likely to stay in sliding regions on the guided surfaces. In addition, since a spacing between the guide and guided surfaces gradually widens from the upper end sides to the lower ends of the guided surfaces, even if the guided surfaces slides downward with respect to the guide surface when the white key is pressed, the grease applied to each of the surfaces is unlikely to be scraped off downward. This also makes it easier to retain the grease in the sliding regions on the guided surfaces. Thus, a feeling of pressing the white key can be improved.

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First Claim