Importance

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Abstract

A hammer assembly for a grand piano comprising: a hammer, a hammer shank, a tubular lever interface, and a moveable knuckle. A grand piano tubular lever interface comprises: a deep socket; a set of two hinge pin attachment holes; a void area; and a moveable knuckle visual location system. A moveable knuckle comprises: a spline; a resilient core; a synthetic buckskin wear surface, and a moveable knuckle visual location system. Novel hammer assembly allows for a direct lever relationship between hammer shank and knuckle without requirement of a forked end hammer shank with knuckle slot. Best mode spline comprises: an upright rectangular portion and a wide base portion, wherein wide base portion includes an intricate shape. Intricate shape comprises: at least one recess area and at least one protrusion area. The inverse of intricate shape is included on the bottom of the tubular lever interface. Moveable knuckle visual location system further comprises at least one pointer located on the moveable knuckle which fits snuggly into one of several notches on the tubular lever interface. Moveable knuckle can be visually located onto tubular lever interface at any one of multiple distinct locations along a range that runs parallel to the length of the hammer shank and the length of tubular lever interface. The moveable knuckle visual location system allows for custom configuration of a specifically dimensioned hammer assembly with custom “tubular lever interface center-to center” dimension to refurbish any brand of grand piano from one stock-set of hammer assembly components.

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First Claim