Bearing structure and transmission structure in piano

Details Bearing structure and transmission structure in piano Bearing structure and transmission structure in piano

1993-03-12

1994-04-05

Gellner, Michael

Music

Instruments

Stringed

84452P, G10C 318, G10C 300

Patent

active

052994848

ABSTRACT:
A bearing structure in a piano action part which can always maintain the torque of rotation of a pin shaft supporting a hammer member within a predetermined range characterized in that the bearing structure comprises a pin shaft fixed to a hammer member, a support member having through-holes through which the pin shaft passes and cloth members with which the spaces between the through-holes and the pin shaft inserted through the through-hole are packed, and that the support member is made of a cellulose derivative resin composition containing silica having a number of silanol groups of 3.0 or less per 100 square .ANG. and a BET specific surface area of 100 to 210 m.sup.2 /g, and a transmission structure in a piano characterized in that the transmission structure comprises a hammer member and the above-mentioned bearing structure.

REFERENCES:
patent: 3583271 (1971-06-01), Corwin
patent: 3730963 (1973-05-01), Imagawa
patent: 4840104 (1989-06-01), Ishida et al.

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