Piano action bushing assembly

Claim 1

IN A PIANO ACTION, THE COMBINATION WITH A BIFURCATED ACTION MEMBER AND A TONGUED ACTION MEMBER HAVING ITS TONGUE DISPOSED BETWEEN THE ARMS OF SAID BIFFURCATED ACTION MEMBER AND IN SPACED RELATION THERETO TO PROVIDE OPPOSED SURFACE PORTIONS AT OPPOSITE SIDES OF SAID TONGUE, OF A PIVOTAL CONNECTION BETWEEN SAID ARMS AND SAID TONGUE COMPRISING AXIALLY ALIGNED BUSHINGS FRICTIONALLY RECEIVED IN SAID ARMS WITH A LIGHT PUSH-FIT, SAID BUSHINGS EACH HAVING AN INTEGRAL ANNULAR FLANGE AT ONE END, SAID FLANGES BEING DISPOSED AT OPPOSITE SIDES OF SAID TONGUE BETWEEN SAID TONGUE AND SAID FORK ARMS AND SPACING SAID TONGUE FROM SAID ARMS, THE RESPECTIVE FLANGES EACH HAVING THEIR ANNULAR SURFACE PORTIONS IN SUBSTANTIALLY CLOSE-FITTING SURFACE ENGAGEMENT WITH OPPOSED SURFACE PORTIONS OF SAID TONGUE AND THE ASSOCIATED FORK ARM, SAID BUSHINGS BEING MADE OF A SUBSTANTIALLY NON-HYGROSCOPIC ELASTOMERIC MATERIAL EXHIBITING A LACK OF COLD FLOW UNDER LONG-CONTINUED STATIC LOAD AND POSSESSING A LOW COEFFICIENT OF FRICTION IN THE RANGE OF FROM 0.02 TO 0.22 AND, A BEARING PIN FIXEDLY SECURED TO SAID TONGUE AND JOURNALLED IN SAID BUSHINGS WITH AN INTERFERENCE FIT OF UP TO 0.004".