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Machine translation
1. (WO1980000631) IMPROVEMENTS IN SOLENOID DASHPOT PEDAL ACTUATOR ASSEMBLIES
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/000631    International Application No.:    PCT/US1979/000731
Publication Date: 03.04.1980 International Filing Date: 17.09.1979
IPC:
G10F 5/02 (2006.01)
Applicants:
Inventors:
Priority Data:
943896 19.09.1978 US
Title (EN) IMPROVEMENTS IN SOLENOID DASHPOT PEDAL ACTUATOR ASSEMBLIES
(FR) AMELIORATION DES ASSEMBLAGES D"ACTIONNEMENT DE PEDALIERS PAR DASH-POT A SOLENOIDE
Abstract: front page image
(EN)Solenoid-dashpot assembly for actuating the foot pedals of a player piano to more closely approximate the touch of a human player instead of the tromped down effect associated with electro-mechanical player pianos. The piano pedal (10) is connected to the armature (36) of a solenoid-dashpot assembly (21) by interconnecting linkage (17). Dashpot piston (60) is adjustably secured to armature shank portion (38) for movement within dashpot cylinder (56). Annular groove (65), formed in the peripheral edge (66) of piston (60), floatingly houses O-ring (70) to seal the chamber within cylinder (56) from the ambient above piston (60). A pair of needle valve elements (82, 83) extending through piston (60) provide variable constricted air passages to control the response of the solenoid-dashpot assembly (21). Felt pads (87) muffle the sound of the air passing through apertures (80, 81).
(FR)Un assemblage de dash-pot a solenoide pour actionner les pedaliers d"un piano mecanique afin de mieux correspondre au toucher d"un executant, au lieu de l"effet de sons caverneux associes aux pianos electro-mecaniques. La pedale du piano (10) est reliee a l"armature (36) d"un assemblage de dash-pot a solenoide par la liaison d"interconnexion (17). Le piston d"amortissement (60) est fixe de maniere ajustable a la partie tige de l"armature (38) pour se mouvoir a l"interieur du cylindre du dash-pot (56). Une rainure annulaire (65) formee dans le bord peripherique (66) du piston (60) recoit de maniere flottante des joints toriques (70) pour isoler la chambre a l"interieur du cylindre (56) du milieu ambiant au-dessus du piston (60). Une paire de soupapes a pointeau (82, 83) s"etendent au travers du piston (60) fournissant des passages d"air variablement restreints pour controler la reponse de l"assemblage du dash-pot a solenoide (21). Des coussinets en feutre (87) assourdissent le son de l"air passant au travers des ouvertures (80, 81).
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)