Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1982-03-19
1985-02-19
Pellinen, A. D.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
84 114, 84DIG7, 200159B, H01H 900
Patent
active
045007560
ABSTRACT:
A keyboard for a musical instrument having a plurality of elongated keys with each key having a rearwardly extending actuating arm. The arm has an upper and a lower nonresilient switch actuator for actuating a respective first and second keyboard switch with each switch having a substrate with at least one fixed contact. A deformable membrane has coupled thereto a movable contact which is adapted for movement into and out of electrical connection with the fixed contact. The first and second switches are positioned so that the lower actuator normally maintains closed the first switch and when the key is actuated the first switch opens and the upper actuator closes the second switch. The deformable membrane is formed of Poron cellular urethane which distributes and absorbs the actuation force and springs back to its undeformed shape when not actuated.
REFERENCES:
patent: 3447414 (1969-06-01), Lo Duca
patent: 3657460 (1972-04-01), Cutler
patent: 3699294 (1972-10-01), Sudduth
patent: 3728509 (1973-04-01), Shimojo
patent: 3745874 (1973-07-01), Martin et al.
patent: 3750522 (1973-08-01), Groves et al.
patent: 3774493 (1973-11-01), Yamada
patent: 3855894 (1974-12-01), Thomas et al.
patent: 3862879 (1975-01-01), Barron et al.
patent: 3911233 (1975-10-01), Nakamura et al.
patent: 3911780 (1975-10-01), Dyle et al.
patent: 3932722 (1976-01-01), Obata et al.
patent: 3965789 (1976-06-01), Pearlman
patent: 4079651 (1978-03-01), Matsui
patent: 4111091 (1978-09-01), Hinago
patent: 4117279 (1978-09-01), Schoemer
patent: 4186638 (1980-02-01), Iijima
patent: 4205583 (1980-06-01), Absmann
patent: 4258096 (1981-03-01), LaMarche
patent: 4272657 (1981-06-01), Iijima
Poron, Rogers Corporation, 12/78, Brochure of 4 sheets.
Feagans Frederick C.
Nordquist Albert W.
Ginsburg Morris
Pellinen A. D.
Pratt-Read Corporation
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