The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1999
Filed:
Oct. 22, 1997
Shinji Niitsuma, Hamamatsu, JP;
Kabushiki Kaisha Kawai Gakki Seisakusho, Hamamatsu, JP;
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.