US Patent 59111617 - Piano Escapement Action

[Clark]

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I did a search for "piano action" and "repetition" on  the US Patent and
Trademark Office site and found this patent, filed by Scott Jones and
Stefan Knupfler, assignee Steinway, Inc., June 8, 1999:


     "A knuckle assembly for an escapement action of a piano includes a
     knuckle, a jack retainer, and an adjustment means acting between
     the retainer and the knuckle for positioning the retainer relative
     to the knuckle. The knuckle assembly is mountable between first and
     second ends of a hammershank. The knuckle defines a knuckle surface
     for engagement with a jack. The knuckle is arranged for escape of
     the jack from engagement with the knuckle surface during depression
     of a piano key. The retainer retains the jack in an "at rest"
     position with the jack in engagement with the knuckle surface in
     opposition to force of a spring urging the jack toward the "at
     rest" position. A piano escapement action assembly includes a
     hammershank, a knuckle assembly, a jack engaged with a knuckle
     surface in an "at rest", and a spring disposed to urge the jack
     toward the "at rest" position."

I have in the shop an 1890's Broadwood Short Concert Grand with a less
adjustable version of this very invention, also with Thayer-type
knuckles. Does anyone know about the recent patent?

Clark


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