Patent ID: 6232537
Filing Date: 2001-05-15
Classification: G10C

Abstract:
A piano keyboard action assembly comprising:a multi-bar linkage further comprising;a whippen pivotably connected to a repetition lever,an articulated jack having a lower link pivotably connected to an upper link,said whippen pivotably connected to said lower link,said repetition lever pivoted to said whippen,said upper link pivotably connected to said repetition lever,a torsional spring disposed between said whippen and said repetition lever so as to rotationally bias said whippen and said repetition lever apart, andsaid torsional spring comprising a coil having upper and lower spring arms attached to said coil and defining an open angle therebetween wherein said upper spring arm engages said repetition lever and lower said spring arm engages said lower link.