Rotary damper for generating damping force variable in dependenc

Details Rotary damper for generating damping force variable in dependenc Rotary damper for generating damping force variable in dependenc

1997-05-21

1998-11-17

Spyrou, Cassandra C.

Music

Instruments

Stringed

G10C 302

Patent

active

058379118

ABSTRACT:
A damper assembly is provided between a side arm of an upright piano and a fall board for preventing the fall board from violent collision with a key slip, the damper assembly includes a rotary damper embedded into the fall board and producing small damping force during a rotation of the fall board from the closed position and a vertical position and large damping force during a rotation of the fall board from the vertical position to the closed position, a turnable plate member turnably connected to the side arm and not allowing the shaft member to turn with respect thereto, a stopper held in contact with the turnable plate member between the vertical position and the closed position and a spring generating resilient force larger than the small damping force and smaller than the large damping force so as to allow the turnable plate member to turn together with the rotary damper between the vertical position and an open position, and the damper assembly allows a player to move the fall board without large force.

REFERENCES:
patent: 5056396 (1991-10-01), Furukawa

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