Music – Instruments – General features
Patent
1997-10-22
1999-08-31
Donels, Jeffrey W.
Music
Instruments
General features
G10C 312
Patent
active
059456175
ABSTRACT:
A plate-like member or rib 19 is extended in a back-to-front direction of a key 14. The height of a rear end of a flat portion 12 is regulated by an upper flange portion 21c and a lower flange portion 22 of the rib 19. A wippen 30 provided with a jack 44 is attached via a bearing member 33 for supporting a wippen swing axis 31 onto a chassis 11. A hammer 50 is attached via a center rail 60 provided with a bearing member 65 for supporting a hammer swing axis 51 onto the chassis 11. A bearing 16 for supporting a key support 15 is fixed to the chassis 11 with a flange portion 61 of the center rail 60 abutting on a rear L-shaped leg 18. A substantially L-shaped rail 67 is fixed with a screw on the center rail 60, which has on its top face a hammer cushion 68 for abutting a rest portion 52 of the hammer 50 and on its lower face a regulating felt for abutting on a hack tail 47. The wippen 30 has a long swing radius, and therefore a larger inertial moment by a weight 41, as compared with the jack 44 and the hammer 50. The rest portion 52, a butt portion 53 and a catcher portion 54 are provided on a continuous face of the hammer 50. A cushion material 56 constituted of a urethane foam layer for absorbing impact and an artificial leather layer providing slidability is placed on the continuous face. The key support 15 is provided between a sliding tape 32 of the wippen 30 and a jack axis 45.
REFERENCES:
patent: 5036743 (1991-08-01), Yamaguchi et al.
patent: 5062342 (1991-11-01), Nagatsuma
patent: 5545839 (1996-08-01), Kawamura et al.
patent: 5565636 (1996-10-01), Sugiyama
patent: 5571983 (1996-11-01), Yamaguchi et al.
patent: 5741995 (1998-04-01), Kawamura et al.
Donels Jeffrey W.
Kabushiki Kaisha Kawai Gakki Seisakusho
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