| 摘要 |
An upright piano, wherein: a) within the overall lever-hammer, the total weight of the hammer butt plus balance hammer exceeds the weight of the hammer by at least 60%; b) the arm of the lever-hammer has a measurement of less than 65 millimeters; c) the center of gravity of the lever-hammer is shifted rearwards from the vertical passing through the pin in the opposite direction to the string by a distance exceeding one centimeter such that, at the moment of striking, the segment which joins the center of gravity to the pin of the lever-hammer forms with the vertical a positive angle of at least 7°; d) a spoon is added, symmetrical to and opposite the spoon fixed to the wippen on the other side of the rod of the damper, this spoon being hinged, by a lever provided with a counterweight, to a fixed structure.
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