Abstract: An upright piano main action rail with a special cross sectional shape of its lower half that angles or curves towards the back of the piano to effectively relocate the lower front surface of upright piano main action rail from a position in front of the row of whippen flanges as with the prior art to a relocated new position behind the row of whippen flanges to enable the front mounting of whippen flanges to the main action rail. Upright piano main action rail has all whippen mounting holes located its the lower front surface instead of the lower rear surface as with prior art upright piano main action rails.

Abstract: A damper action for an upright piano that comprises a springed tab on the damper lever that “ratchets” or gives way or folds away in one direction and does not in the other, to provide retention when the spring tab passes by the longitudinal ridge on the sostenuto rod in one direction and non-retention when the spring tab passes by the longitudinal ridge on the sostenuto rod the other direction. The ratchet aspect of the spring tab uses tension from the damper spring and does not require a separate spring to apply tension to yield the ratchet effect.

Abstract: A damper action for an upright piano that comprises a springed tab on the damper lever that “ratchets” or gives way or folds away in one direction and does not in the other, to provide retention when the spring tab passes by the longitudinal ridge on the sostenuto rod in one direction and non-retention when the spring tab passes by the longitudinal ridge on the sostenuto rod the other direction. The ratchet aspect of the spring tab uses tension from the damper spring and does not require a separate spring to apply tension to yield the ratchet effect.

Abstract: Lost motion compensation device is a mechanical device that rigidly and pivotally connects the rest rail of an upright piano to the front end of the whippen of an upright piano to cause the two member to rotate in unison as the rest rail is rotated by depressing and releasing the soft pedal on an upright piano.

Abstract: Lost motion compensation device is a mechanical device that rigidly and pivotally connects the rest rail of an upright piano to the front end of the whippen of an upright piano to cause the two member to rotate in unison as the rest rail is rotated by depressing and releasing the soft pedal on an upright piano.

Abstract: A piano action flange with an open-slotted rail attachment feature that is a slot-shaped void completely through the piano action flange, running in the longitudinal direction of the piano action flange, with width slightly larger than the outer diameter of the thread end the flange screw but smaller that the head diameter of the flange screw, where the slot-shaped void is open on one end, breaking through the end of said piano action flange, to leave the slot-shaped void open and accessible from the end of the piano action flange.

Abstract: An upright piano main action rail with a thinner cross section and relocated lower front surface so that when the main action rail is installed an the upright piano, the lower front surface of upright piano main action rail resides in the same location as the lower rear surface of prior art upright piano main action rails. An upright piano main action rail also has all whippen mounting holes located on the lower front surface instead of the lower rear surface as is traditional.

Abstract: A hammer butt for an upright piano with a half-conical hammer shank hole located on the top of said hammer butt which has a cylindrical-shaped cross section as viewed from the side of said hammer butt flange and a trapezoidal-shaped cross section as viewed from the front of said hammer butt, with the bottom of said half-conical hammer shank hole representing the short side of said trapezoidal-shaped front cross section.

Abstract: A piano action flange with an open-slotted rail attachment feature that is a slot-shaped void completely through the piano action flange, running in the longitudinal direction of the piano action flange, with width slightly larger than the outer diameter of the thread end the flange screw but smaller that the head diameter of the flange screw, where the slot-shaped void is open on one end, breaking through the end of said piano action flange, to leave the slot-shaped void open and accessible from the end of the piano action flange.