Piano escapement action

A piano escapement action assembly, comprising:

• a hammershank having a first end mounted to a piano at a hammershank pivot point for pivoting movement and a second end carrying a hammer to strike a string, said hammershank comprising a knuckle disposed therealong between said hammershank pivot point and said second end carrying said hammer;
• a jack having a jack surface in engagement with a knuckle surface of said knuckle in an "at rest" position, said jack being arranged relative to said knuckle and to a key of the piano to convey motion of the key to said knuckle, and to disengage said jack surface from said knuckle surface during depression of the key;
• a spring disposed to urge said jack toward the "at rest" position;
• and
• a jack retainer assembly positioned to oppose said spring to retain said jack in the "at rest" position, and allowing said jack, in response to depression of the key, to move in a coupled rotary motion with said knuckle prior to disengagement of said jack surface from said knuckle surface to allow said jack surface engaged with said knuckle surface to remain engaged with said knuckle surface during movement of said knuckle.

A piano escapement action, comprising:

• a hammershank having a first end pivotally mounted to a piano and a second end carrying a hammer to strike a string, said hammershank comprising a knuckle disposed therealong between said first end and said second end;
• a jack having a jack surface in engagement with a knuckle surface in "at rest" position, said jack being arranged relative to said knuckle and to a key of the piano to convey motion of the key to said knuckle, and to disengage said jack surface from said knuckle surface during depression of the key;
• a spring urging said jack toward the "at rest" position;
• and
• a jack retainer cushion connected to said hammershank and arranged to contact said jack in the "at rest" position in a manner to oppose said spring and retain said jack in the "at rest" position.