Patent ID: 9437173
Filing Date: 2016-09-06
CPC Classification: G10C

Claim Text:
1. A piano action for an upright piano comprising: a plurality of hammers, each for striking a respective one of a plurality of strings; a plurality of hammer shanks, each for turnably supporting a respective hammer; a plurality of hammer rails that restrict the hammer shanks from turning after the hammers strike strings; and a plurality of hammer cushions, a first surface of each placed on a respective one of the hammer rails to absorb motion energy generated by collision with a contact surface of a respective hammer shank as a key associated with the respective hammer shank is returned to a key released state, wherein each of the hammer cushions has a second surface opposite to the first surface that is sloped at an angle and having a larger thickness at one end and a shorter thickness at another end in such a way that the second sloped surface is not parallel to the contact surface of the respective hammer shank in a key pressed state, and the key released state, and wherein a distance between the second sloped surface and the contact surface of the respective hammer shank increases along an upper portion of the respective hammer shank towards the respective hammer in the key released state.