Friction at the jack and knuckle interface in a grand piano eliminated
First Claim
1. A grand piano action comprising a flange carrying a hammer shank carrying a piano hammer and a knuckle;
- a jack being carried by a wippen lever;
a capstan screw on the piano key supporting said wippen lever;
an arm of said jack opposing an escapement let off buttons a vertically oriented portion of said wippen lever carrying a double ended spring;
said wippen lever carrying a regulating screw, the first end of said spring supporting said repetition lever, the second end of said spring being in a hole along said regulating screw;
the top of said jack having a projection, said projection acting against said knuckle by a counter weight carried by said jack.
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Abstract
A grand piano action the jack having a projection acting against the knuckle dependent from the hammer shank carrying the piano hammer by a counter weight carried by the jack eliminating the spoon and the regulating button and the jack spring pressing against the jack causing the traditional excessive friction at the jack and knuckle interface. Friction is totally eliminated from the conventional grand piano action by the capstan screw on the piano key lifting the wippen lever near the pivot of the jack. Patents relating to the problem of excessive friction. Finholm U.S. Pat. No. 4,774,868. Steinway U.S. Pat. Nos. 5,511,454-5,911,167. Bladwin U.S. Pat. No. 6,232,537.
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Citations
25 Claims
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1. A grand piano action comprising a flange carrying a hammer shank carrying a piano hammer and a knuckle;
- a jack being carried by a wippen lever;
a capstan screw on the piano key supporting said wippen lever;
an arm of said jack opposing an escapement let off buttons a vertically oriented portion of said wippen lever carrying a double ended spring;
said wippen lever carrying a regulating screw, the first end of said spring supporting said repetition lever, the second end of said spring being in a hole along said regulating screw;
the top of said jack having a projection, said projection acting against said knuckle by a counter weight carried by said jack. - View Dependent Claims (2, 3, 4, 11, 12, 13, 14, 20, 21, 22, 23)
- a jack being carried by a wippen lever;
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5. A grand piano action comprising a flange carrying a hammer shank carrying a piano hammer and a knuckle, said knuckle resting on a repetition lever, said repetition lever being carried by a vertically oriented portion of a wippen lever, said wippen lever carrying a jack and a spoon, a regulating screw passing through said jack carrying a button, said button adjoining said spoon, said wippen lever including a regulating screw having a hole along said regulating screw, a spring in said hole adjoining the underside of an arm of said jack, said regulating screw regulating tension of said spring about an abutment dependent from said wippen levers said wippen lever including a second regulating screw having a hole along said regulating screw;
- said vertically oriented portion of said wippen lever carrying a spring, the first portion of said spring supporting said repetition lever, the second portion of said spring being in said hole along said regulating screw, said regulating screw regulating tension of said first portion of said spring supporting said repetition lever, a capstan screw on the piano key supporting said wippen lever.
- View Dependent Claims (6, 7, 8, 9, 10)
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15. A grand piano action comprising a flange carrying a hammer shank carrying a piano hammer and a knuckle, said knuckle resting on a repetition lever, said repetition lever being carried by a vertically oriented portion of a wippen lever;
- said wippen lever carrying a jack at the distal end of said wippen lever;
a first end of a traditional spring carried by said vertically oriented portion of said wippen lever supporting said repetition lever, the second end of said traditional spring supporting said jack;
a capstan screw on the piano key supporting said wippen lever at a selected point between the traditional appendage and said distal end of said wippen lever;
the greater the distance between said appendage and said capstan screw the greater the leverage of said wippen lever the lesser the friction at the jack and knuckle interface. - View Dependent Claims (16, 17, 18, 19, 25)
- said wippen lever carrying a jack at the distal end of said wippen lever;
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24. In a conventional grand piano action the jack carried by the wippen lever including a projection acting against the knuckle dependent from the hammer shank carrying the piano hammer, said projection being a flat spring means attached to the back side of said jack, said flat spring means having a hole for a regulating screw, said regulating screw being in a threaded hole in said jack regulating position of the lifting surface of said jack under said knuckle by said projection acting against said knuckle effected by the conventional jack spring biasing said jack.
Specification